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Configuring and Monitoring
the DLSw Protocol

This chapter includes all of the configuration and monitoring commands applicable to DLSw. It contains these sections:

About DLSw Configuration and Monitoring Commands

Accessing the DLSw Configuration Prompt

Accessing the DLSw Monitoring Prompt

DLSw Commands

About DLSw Configuration and Monitoring
Commands

DLSw configuration commands are available at the DLSw config> prompt. Changes made to the router's configuration do not take effect immediately. They only become part of the router's non-volatile configuration memory when it restarts.

Conversely, DLSw monitoring commands are available at the DLSw> prompt. Monitoring commands take effect immediately, but do not become part of router's non-volatile configuration memory. Thus, while monitoring commands allow you to make real-time changes to the router's configuration, these changes are temporary. The router's configuration memory overwrites them when the router restarts.

Monitoring consists of these actions:

Accessing the DLSw Configuration Prompt

 Use the router's configuration process to change the configuration of the router. The new configuration takes effect when you restart the router.

To enter the configuration environment, enter config. This brings you to the Config> prompt:

MOS Operator Control

* config

Config>
If the Config> prompt does not appear immediately, press Return again.

All DLSw configuration commands are entered at the DLSw config> prompt. To access this prompt, enter protocol dls as shown: 

Config>protocol dls
DLSw protocol user configuration
DLSw config>

Accessing the DLSw Monitoring Prompt

 To enter the monitoring environment, enter monitor. This brings you to the monitoring environment as shown:

MOS Operator Control

* monitor
Monitor>
You enter DLSw monitoring commands at the DLSw> prompt. To access this prompt, enter protocol dls at the Monitor> prompt as shown: 

Monitor> protocol dls
DLSw>

DLSw Commands

 Table 1 lists the DLSw configuration and monitoring commands.

[C] means the command is available at the DLSw config> prompt.

[M] means the command is available at the DLSw> prompt.

Table 1 DLSw Commands

Command Function
Add [C] [M] Adds an SDLC link station or a TCP neighbor IP address.

BAN [C] [M] Displays the Boundary Access Node prompt.

Close-Sap [C] [M] Closes a currently opened Service Access Point (SAP). SDLC interfaces use SAPs for communication on the network.

Delete [C] [M] Removes configured SDLC link stations and TCP connections.

Disable [C] [M] Disables the DLSw protocol, Auto-TCP-Reconnect, SDLC link station, and LLC disconnect functionality.

Enable [C] [M] Enables the DLSw protocol, Auto-TCP-Reconnect, SDLC link station, and LLC disconnect functionality.

Join-Group [C] [M] Allows DLSw neighbors to find each other dynamically.

Leave-Group [C] [M] Removes the router from the specified DLSw group.

List [C] [M] Displays information for SDLC link stations, SAPs, circuit priority, DLSw groups, and DLSw sessions. The command also provides detailed information on TCP capabilities, connections, and statistics.

NetBIOS [C] [M] Displays the NetBIOS prompt.

Open-Sap [C] [M] Allows DLSw to transmit data over the specified SAP.

Set [C] [M] Configures LLC2 parameters, number of DLSw sessions, SRB segment number, TCP buffer size, memory allocation, protocol timers, and circuit priority.

Exit [C] [M] Returns you to the Config> prompt or Monitor> prompt.

Add [C] [M]

Configures an SDLC link station or a TCP neighbor IP address.

Syntax: add

sdlc
tcp

sdlc

 Adds information specifically for adding an SDLC link station to the configuration on an SDLC interface. You must use add sdlc once for each secondary station on the SDLC link.

The source and destination MAC addresses and SAPs are mandatory and must be correct for a DLSw connection to take place. If the local devices are to communicate with remote SNA devices on an SNA LAN, such as a Token Ring, then the SAPs must correspond to those in use on the remote LAN. However, if the local SDLC devices are to communicate with remote SNA devices that are attached by an SDLC data link, then the MAC addresses and SAPs are arbitrary, provided they are legal values. In this case, the MAC addresses and SAPs must logically map to the reverse source and destination addresses at the remote router.

In SDLC-to-SDLC configurations, the destination SAP (DSAP) of the primary link role router has special significance. If you set it to zero, it designates that a successful SDLC protocol handshake with the adjacent device should not generate a DLSw connection (CANUREACH). For PU2 (non-negotiable) links with each router connected via an SDLC interface, set the DSAP of the local primary router to zero. This prevents unnecessary DLSw circuit startups from occurring. Otherwise, the local primary router attempts a DLSw CANUREACH connection to the local secondary router, but since the secondary router cannot itself activate the data link to the adjacent SDLC primary station, the connection is guaranteed to fail.

Example: add sdlc

Interface #[0]?
SDLC Address [C1]?
Source MAC Address [0000C9123456]
Idblk in Hex (0-0xfff) [0]?
Idnum in Hex (0-0xfffff) [0]?
LLC Source SAP (0 for auto-assign) [0]?
LLC Destination SAP [4]?
Destination MAC Address [400000000001]?
Interface #

 The number of the SDLC interface you are adding to the SDLC link station.

SDLC Address

 The SDLC address of the link station that you are connecting between 01 - FE.

Source MAC
address

 The MAC address for the attached SDLC PU.

Idblk in Hex

 The 3-digit hexadecimal value that identifies the device (PU) to which you are connecting. Normally you use Idblk for PUs defined as switched major nodes. Therefore, this value should match this same parameter in the VTAM Switched Major Node that corresponds to this PU.

Idnum in Hex

 The 5-digit hexadecimal value that identifies the specific device type (2.0) that you are connecting. Normally you use Idnum for PUs that are switched major nodes. Therefore, this value should match this same parameter in the VTAM Switched Major Node that corresponds to this PU.

LLC Source SAP

 Identifies the PU link station to the DLSw domain. This can be explicitly assigned via configuration or automatically assigned by software. SAPs only apply to LLC use.

LLC Destination SAP

 Defines the SAP to be used when automatically attempting a connection when the link station comes up. If this SAP is 0, then the link station is in passive mode and does not attempt to establish a circuit. In this case, the router ignores the destination MAC address. See above for more information on setting the DSAP.

Destination MAC Address

 The MAC address of the remote link station with which a connection is established when the SDLC device becomes active. The MAC address is in non-canonical bit order (Token Ring) format. This is true even if the remote end station is on the Ethernet.

tcp

Adds the IP address of the DLSw neighbor to which the TCP is connected. You can make this connection in two ways: manual configuration of IP neighboring addresses or with DLSw groups.

Example: add tcp 

Enter the DLSw neighbor IP Address [0.0.0.0]? 128.185.14.1
Transmit Buffer Size (Decimal) [5120]?
Receive Buffer Size (Decimal)  [5120]? 
Maximum Segment Size (Decimal) [1024]?
Enable/Disable Keepalive? (E/D) - [D]?
Neighbor Priority (H/M/L) [M]?
Enter the DLSw neighbor IP
Address

 The IP address of the remote DLSw neighbor in the IP network to which you want to make a connection.

Transmit Buffer Size

 The size of the packet transmit buffer between 1024 and 32768. The default size is 5120.

Receive Buffer Size

 The size of the packet receive buffer between 1024 and 32768. The default size is 5120.

Maximum
Segment Size

 The maximum size of the TCP segment is between 1024 and 16384. The default size is 1024.

Enable/Disable Keepalive (E/D)

 Indicates whether you want the DLSw neighbor to send link keepalive messages. The default is D (Disable).

Neighbor Priority

 Allows you to specify the neighbor priority as either High, Medium, or Low. DLSw uses this parameter to determine which DLSw neighbor to choose when multiple neighbors can reach a target station.

BAN [C] [M]

Displays the Boundary Access Node (BAN) configuring or monitoring prompt. See Using Boundary Access Node for information on the commands available at these prompts.

Syntax: ban

Example: ban

BAN (Boundary Access Node) configuration
BAN config>

Close-Sap [C] [M]

 Disables DLSw for the specified Service Access Point (SAP). LLC uses these SAPs for configuration on the network.

Syntax: close-sap

Example: close-sap

Interface # [0]?
Enter SAP in hex (range 0-F4), 'SNA', 'NB' or 'LNM' [4]? nb
SAP F0 closed on interface 0
Interface #

 The interface number used by the open SAP.

Enter SAP

 You can enter inidividual SAPs in hex or you can enter SNA, NB (NetBIOS), or LNM.

If you enter SAPs in hex, the range is 0 to F4, and the SAP must be an even number.

Delete [C] [M]

Removes an SDLC link station or a TCP neighbor IP address from the DLSw configuration.

Delete [C]

Syntax: delete

sdlc
tcp

sdlc

Removes the specified SDLC link station from the list of stations to which DLSw can connect. This also terminates any existing session.

Example: delete sdlc 

Interface #[0]?
SDLC Address [C1]?
Record deleted
Interface #

 The interface number of the router that connects to the SDLC link station.

SDLC Address

 The SDLC address of the remote link station that you are deleting. Values are in the range 01 to FE.

tcp

Removes the IP address of the DLSw neighbor to which you are making the TCP connection.

Example: delete tcp 

IP Address [0.0.0.0]? 128.185.14.1

Delete [M]

Syntax: delete

sdlc
tcp

sdlc

Removes the specified SDLC link station from the list of stations to which DLSw can connect. This also terminates any existing session.

Example: delete sdlc 

Interface #[0]?
SDLC Address [C1]?
Record deleted
Interface #

 The interface number of the router that connects to the SDLC link station.

SDLC Address

 The SDLC address of the remote link station that you are deleting. Values are in the range 01 to FE.

tcp

Removes the IP address of the DLSw neighbor to which you are making the TCP connection. This also terminates the TCP connection if one exists.

Example: delete tcp 

IP Address [0.0.0.0]? 128.185.14.1

Disable [C] [M]

Disables the DLSw protocol, an SDLC link station, the LLC disconnect functionality, and automatic TCP reconnection.

Syntax: disable

dls
llc disconnect on session loss
sdlc
auto-tcp-reconnect

dls

 Prevents the router from transmitting DLSw functions over all DLSw configured interfaces.

Example: disable dls

llc

Prevents the router from terminating an LLC connection actively by issuing a DISC LLC frame when a DLSw session terminates.

This command does not affect switching functionality for LLC in DLSw. Use the close-sap command to stop LLC switching functionality.

Example: disable llc

sdlc

Prevents DLSw connections to the specified SDLC link station.

If you enter this command in the monitoring environment, it terminates the existing SDLC connection.

Example: disable sdlc 

Interface #[0]? 1
SDLC Address [C1]?
Record updated

auto-tcp-reconnect

 Disables automatic TCP station re-establishment. When you disable this feature, DLSw does not establish TCP sessions until it needs them.

Example: disable auto

Enable [C] [M]

Enables the DLSw protocol, SDLC link stations, the LLC switching functionality, and auto-tcp-reconnect.

Enable [C]

Syntax: enable

dls
llc
sdlc
auto-tcp-reconnect

dls

Enables DLSw operation on the router.

Example: enable dls

llc

Allows the router to terminate an LLC connection upon the loss of the TCP connection.

Example: enable llc

sdlc

Enables DLSw connections to the specified SDLC link station.

Example: enable sdlc 

Interface #[0]? 1
SDLC Address [C1]?
Record updated

auto-tcp-reconnect

 Enables DLSw to automatically establish TCP sessions at startup and to re-establish a session when it breaks. The default is enabled.

Example: enable auto-tcp-reconnect

Enable [M]

Syntax: enable

llc
sdlc
auto-tcp-reconnect

llc

Allows the router to terminate an LLC connection upon the loss of the TCP connection.

Example: enable llc

sdlc

Enables DLSw connections to the specified SDLC link station.

Example: enable sdlc 

Interface #[0]? 1
SDLC Address [C1]?
Record updated

auto-tcp-reconnect

 Enables DLSw to automatically establish TCP sessions at startup and to re-establish a session when it breaks. The default is enabled.

Example: enable auto

Join-Group [C] [M]

Allows DLSw neighbors to find and to create TCP sessions with each other dynamically. This eliminates the need to define TCP neighbors with the add tcp command.

There are three types of groups: Client, Server and Peer-to-Peer. DLSw groups alleviate the need for long lists of static IP addresses and the costs of maintaining them. The IP internet being used must support multicast routing.

A DLSw router can be a member of a maximum of 64 groups. DLSw group membership uses the MOSPF protocol. To use the functionality of the join-group command, you must configure OSPF and MOSPF from the OSPF Config> prompt.

When you assign a DLSw router to a group, DLSw automatically adds one of two addresses to the group number to form a multicast address. The router transmits the multicast address to identify itself to other group members and to transmit packets to those members. The two addresses that are added to the group number are 225.0.1.0 for DLSw clients and neighbors, and 225.0.1.64 for DLSw servers.

For example, the multicast address for client in group 2 would be 225.0.1.2.

Syntax: join-group

Example: join-group

Group ID (1-64 Decimal) [1]? 2
Client/Server or neighbor Group member (C/S/P)- [C]?
Transmit Buffer Size (Decimal) [5120]?
Receive Buffer Size (Decimal)  [5120]? 
Maximum Segment Size (Decimal) [1024]?
Enable/Disable Keepalive (E/D)- [D]?
Neighbor Priority (H/M/L) [M]?
Group ID

 The number of the group that you want this router to join.

Client/Server or neighbor Group Member

 The type of group that you want to join, C for client, S for server, and P for peer-to-peer. A server forms a TCP connection with a client.

Transmit Buffer Size

 The size of the packet transmit buffer in the range of 1024 to 32768. The default is 5120.

Receive Buffer Size

 The size of the packet receive buffer between 1024 and 32768. The default size is 5120.

Maximum
Segment Size

 The maximum size of the TCP segment in the range of 64 to 16384. The default is 1024.

Enable/Disable Keepalive

 Indicates whether you want the DLSw neighbor to send link keepalive messages. Default is D (Disable).

Neighbor Priority
(H/M/L) [M]?

 Specifies the neighbor priority as High, Medium, or Low. DLSw uses this parameter to determine which DLSw neighbor to choose when multiple neighbors can reach a target station.

Leave-Group [C] [M]

Removes the router from any specified DLSw groups that you configured with the join-group command.

Leave-Group [C]

In the configuration environment, leave-group does not affect existing TCP connections belonging to the specified group.

Syntax: leave-group group#

Example: leave-group 2

Leave-Group [M]

In the monitoring environment, leave-group terminates existing TCP connections belonging to the specified group.

Syntax: leave-group group#

Example: leave-group 2

List [C] [M]

Displays DLSw information on SDLC link stations, circuit priority, SAPs, TCP neighbors, and groups.

List [C]

Syntax: list

dls
groups
llc2 sap parameters
open llc2 saps
priority
sdlc link stations
tcp neighbors

dls

Displays the information configured with the enable and set commands.

Example: list dls 

DLSw is                            ENABLED
LLC2 send Disconnect is            ENABLED
Automatic TCP connection           ALWAYS CONNECT

SRB Segment number                 0030
MAC <-> IP mapping cache size      128
Max DLSw sessions                  3000
DLSw global memory allotment       60000
LLC per-session memory allotment   8192
SDLC per-session memory allotment  4096
NetBIOS UI-frame memory allotment  40960

Database age timer                 1200  seconds
Max wait timer for ICANREACH       20    seconds
Wait timer for LLC test response   15    seconds
Wait timer for SDLC test response  15    seconds
Join Group Interval                900   seconds
Neighbor priority wait timer       2.0   seconds
DLSw is

 Status of the DLSw protocol, enabled or disabled.

LLC2 send
Disconnect is

 Status of preventing the router from terminating an LLC2 connection upon the loss of the TCP connection. Values are enabled or disabled.

SRB Segment number

 The SRB segment that identifies DLSw in the RIF.

Max DLSw
Sessions

 The maximum number of DLSw sessions that the router supports.

DLSw global memory allotment

 The maximum amount of memory allowed for use by DLSw.

LLC per-session memory allotment

 The maximum amount of memory allowed for use by each LLC session.

SDLC per-session memory allotment

 The maximum amount of memory allowed for use by each SDLC DLSw session.

NetBIOS UI-frame memory
allotment

 The number of bytes the router allocates as a buffer for NetBIOS UI frames.

Database age
timer

 The maximum time to hold active database entries.

Max wait timer for ICANREACH

 The time to wait for a response to a CANUREACH before giving up.

Wait timer for LLC response

 The maximum amount of time (in seconds) the router waits for an LLC TEST response before retransmitting an LLC TEST frame.

Wait timer for SDLC test
response

 The maximum amount of time (in seconds) the router waits for an SDLC TEST response before retransmitting an SDLC TEST frame.

Join Group
Interval

 Amount of time (in seconds) between DLSw group advertisement broadcasts.

Neighbor Priority Wait Timer

 Amount of time DLSw waits before selecting a neighbor.

groups

Displays group information for a DLSw neighbor previously configured with the join-group command.

Example: list groups

Group Role   Xmit Bufsize  Rcv Bufsize Max Segsize Keepalive  Priority
 1     CLIENT      5120       5120          1024         DISABLED    MEDIUM
Group

 The group number.

Role

 The type of group: Client, Server, or Peer-to-Peer.

Xmit Bufsize

 The size of the TCP transmit buffer in the range of 1024 and 32768. The default is 5120.

Rcv Bufsize

 The size of the TCP receive buffer in the range of 1024 and 32768. The default is 5120.

Max Segsize

 The maximum size of the TCP segment in the range of 64 and 16384. The default is 1024.

Keepalive

 The status of the keepalive functionality, enabled or disabled.

Priority

 Displays the priority of the neighbor router in the selection process. Neighbor priority is either High, Medium, or Low.

llc2 sap parameters

Displays the LLC2 parameters configured with the set llc2 command (see the set command on page 77 for a complete explanation of these parameters). You set these parameters for each interface. If you did not use the set llc2 command to change the LLC2 parameters, no output is generated.

Example: list llc2 

SAP		t1	t2	ti	n2	n3	tw	rw	nw	acc


0		1	1	30	8	1	2	2	1	0
SAP

 SAP number.

t1

 Reply timer.

t2

 Receive Ack timer.

ti

 Inactivity timer.

n2

 Maximum retry value.

n3

 Number of I-frames received before sending ACK.

tw

 Transmit window.

rw

 Receive window.

nw

 ACKs needed to increment the working window (Ww).

acc

 The current LLC2 implementation does not use access priority. As a result, this parameter always defaults to 0.

open

Displays all open SAPs and their associated interfaces.

Example: list open 

Interface				SAP
0          0
0          4
1          4

priority

Lists the circuit priorities selected for SNA and NetBIOS circuits, the transmit ratios between the various circuit priorities, and the largest frame size configured for NetBIOS.

Example: list priority

Priority for SNA DLSw sessions is           MEDIUM   
Priority for NetBIOS DLSw sessions is       MEDIUM   
Message allocation by C/H/M/L priority is   4/3/2/1 
Maximum frame size for NetBIOS is           2052
Circuit priorities are Critical, High, Medium, or Low. The router uses the priority value you assign to selectively limit the burst-length of specific types of traffic. For example, if you assign SNA traffic a priority of Critical and NetBIOS traffic a priority of Medium, with a message allocation of 4/3/2/1, the router processes 4 SNA frames before it processes 2 NetBIOS frames. After the router processes 2 NetBIOS frames, it processes 4 SNA frames, and so on. In this scenario, two thirds of available bandwidth is dedicated to SNA traffic (a ratio of 4 to 2). Note that the router counts frames, rather than bytes, when allocating bandwidth according to the priorities you assign.

sdlc

Displays the SDLC link station information configured with the add sdlc command.

Example: list sdlc 

Net  Addr   Status    Idblk  Idnum   Source SAP/MAC    Dest SAP/MAC
 5    C1    Enabled    017   A0021   04 4018997E05C1   04 401AA9200C1
Net

 The number of the interface that connects to the SDLC link station.

Addr

 The SDLC address, between 01 and FE, of the connecting link station.

Status

 The status of the link station, enabled or disabled.

Idblk

 The 3-digit hexadecimal value that identifies the device (PU) that you are connecting. Normally you use Idblk for PUs on switched lines (as opposed to leased lines). Therefore, this value should match this same parameter in the VTAM Switched Major Node that corresponds to this PU.

Idnum

 The 5-digit hexadecimal value that identifies the specific SDLC PU type (2.0). Normally you use Idnum for PUs on switched lines (as opposed to leased lines). Therefore, this value should match this same parameter in the VTAM Switched Major Node that corresponds to this PU.

Source SAP/MAC

 Identifies the PU link to the DLSw domain and the MAC address of the local link station. The MAC address is in non-canonical bit order (token-ring) format. This is true even if the remote end station is on the Ethernet. Use the Bridge monitoring flip command to flip the MAC address, in such cases.

Dest SAP/MAC

 Identifies the remote side of the connection to the DLSw domain. If this SAP is 0, then the link station is in passive mode and does not attempt to establish a circuit. The MAC address is in non-canonical bit order (token-ring) format. This is true even if the remote end station is on the Ethernet. Use the Bridge monitoring flip command to flip the MAC address, in such cases.

tcp neighbors

Displays configured DLSw neighbors that are TCP neighbors. The neighbors were configured with the add tcp command.

Example: list tcp 

Neighbor      Xmit Bufsize  Rcv Bufsize  Max Segsize Keepalive Priority
--------      ------------  ----------- ----------- ---------  --------
128.185.122.234        5120             5120           1024         DISABLED     MEDIUM
Neighbor

 The IP address of the TCP neighbor

Xmit Buffer Size

 The size of the packet transmit buffer in the range of 1024 and 32768. The default is 5120.

Rcv Buffer Size

 The size of the TCP receive buffer in the range of 1024 and 32768. The default is 5120.

Maximum Segment Size

 The maximum size of the TCP segment in the range of 64 and 16384. The default is 1024.

Keepalive

 The status of the keepalive functionality, enabled or disabled.

Priority

 The priority of the neighbor router in the selection process, either High, Medium, or Low.

List [M]

Syntax: list

dls
dls global
dls sessions all
dls sessions ban
dls sessions dest
dls sessions detail
dls sessions src
dls sessions ip
dls sessions nb
dls sessions range
dls sessions src
dls sessions state
dls cache all
dls cache range
dls memory
groups
llc2 open
llc2 sap
llc2 session
sdlc sessions
sdlc config
tcp capabilities
tcp config
tcp sessions
tcp statistics

dls

Displays information that pertains to the DLSw protocol. The options (global, sessions, cache, and nb) for the DLSw parameters appear below and on the following pages.
Global

 Displays status, timer, and MAC address information about the DLSw protocol.

Sessions

 Displays current DLS session information including source, destination, state, flags, destination IP address, and ID.

Cache

 Lists the addresses in the DLSw MAC address cache.

NB

 Lists information on current active circuits that support NetBIOS.

dls global

Displays DLS global parameter information.

Example: list dls global

DLSw is                            ENABLED
LLC2 send Disconnect is            ENABLED
Automatic TCP connection           ALWAYS CONNECT

SRB Segment number                 000
MAC <-> IP mapping cache size      128
Max DLSw sessions                  1000
DLSw global memory allotment       141056
LLC per-session memory allotment   8192
SDLC per-session memory allotment  4096
NetBIOS UI-frame memory allotment  40960
Database age timer                 1200  seconds
Max wait timer for ICANREACH       20    seconds
Wait timer for LLC test response   15    seconds
Wait timer for SDLC test response  15    seconds
Join Group Interval                900   seconds
Neighbor priority wait timer       2.0   seconds
DLSw is

 Status of the DLSw protocol, enabled or disabled.

LLC2 send
disconnect is

 Status of preventing the router from terminating an LLC2 connection upon the loss of the TCP connection. Values are enabled or disabled.

SRB Segment number

 The SRB segment that identifies DLSw in the RIF.

MAC <-> IP mapping cache size

 Specifies the size of the MAC-IP mapping cache.

Max DLSw Sessions

 The maximum number of DLSw sessions that the router can support.

DLSw global memory allotment

 The maximum amount of memory allowed for use by DLSw.

LLC per-session memory allotment

 The maximum amount of memory allowed for use by each LLC session.

SDLC per-session memory allotment

 The maximum amount of memory allowed for use by each SDLC session.

NetBIOS UI frame memory allotment

The number of bytes the router allocates as a buffer for NetBIOS UI frames.

Database age
timer

 The maximum time to hold active database entries.

Max wait timer for ICANREACH

 The time to wait for a response to a CANUREACH before giving up.

Wait timer for LLC test response

 The maximum amount of time (in seconds) the router waits for an LLC TEST response before retransmitting an LLC TEST frame.

Wait timer for SDLC test
response

 The maximum amount of time (in seconds) the router waits for an SDLC TEST response before retransmitting an SDLC TEST frame.

Join Group
Interval

 Amount of time (in seconds) between DLSw group advertisement broadcasts.

Neighbor priority wait timer

 Specifies the amount of time to wait for ICANREACH responses before selecting a transport.

dls sessions all

Displays current dls session information.

Example: list dls session all

   Source           Destination  State    Flags Dest. IP Addr  Id
1. 400000000003 04 500000000003 04  Connected       128.185.236.51   2  2
Source

 The source MAC address of the session.

Destination

 The destination MAC address of the session.

State

 Current state of the session:

Disconnected— The initial state with no circuit or connection established.

Rslv_pend— The target DLSw is awaiting either a SSP_STARTED indication following a SSP_START request.

Circ_pend— The target DLSw is waiting a SSP_REACHACK response to an SSP_ICANREACH message.

Circ_est— The end-to-end circuit has been established.

Cir_rstrt— The DLSw that originated the reset is awaiting the restart of the data link and a SSP_RESTARTED response to an SSP_RESTART message.

Conn_pend— The origin DLSw is awaiting an SSP_CONTACTED response to an SSP_CONTACT message.

Cont_pend— The target DLSw is awaiting an SSP_CONTACTED confirmation to an SSP_CONTACT message.

Connect_state— The origin DLSw is awaiting an SSP_CONTACTED response to a SSP_CONTACT message.

Disc_pend— The DLSw that originated the disconnect is awaiting an SSP_HALTED response to an SSP_HALT message.

Halt_pending— The remote DLSw is awaiting an SSP_HALTED indication following an SSP_HALT request.

Halt_rstrt— The remote DLSw is awaiting an SSP_HALTED indication following an SSP_HALT request.

Restart_pend— The remote DLSw is awaiting an SSP_HALTED indication following an SSP_HALT request.

Reset_pend— The remote DLSw is awaiting the SSP_HALTED indication following an SSP_HALT request.

Flags

 Flags can be one of the following:
A - CONTACT MSG PENDING

B - SAP RESOLVE PENDING
C - EXIT BUSY EXPECTED
D - TCP BUSY
E - DELETE PENDING
F - CIRCUIT INACTIVE

Dest. IP Addr

 The IP address of the remote DLSw peer.

Id

 The number used to identify the session. Use this number in any command that requires the session ID.

dls sessions ban

Displays current information on BAN sessions.

Example: list dls session ban

BAN port number (user 0 for all ports) [0]?
No active sessions

dls session dest

 Displays DLS session information by destination MAC address.

Example: list dls session dest

Destination MAC Address [40000000001]? 50000000003

   Source         Destination    State      Flags  Dest. IP Addr   Id
1. 400000000003  500000000003    Connected         128.185.236.51   2
2. 400000000002  500000000003    Connected         128.185.236.52   3

dls session detail

 Displays detailed DLS session information.

Example: list dls session detail

Session Identifier [1]? 

   Source         Destination      State       Dest. IP Addr      Id
1. 400000000003  500000000003 04   Connected   128.185.236.51      2

Personality:       TARGET
XIDs sent:         2
XIDs rcvd:         0
Datagrams sent:    0
Datagrams rcvd:    0
Info frames sent:  15
Info frames rcvd:  0
RIF:               0620 0202 B0B0
Personality

 The ORIGINATOR (initiator) or TARGET (recipient) of the connection.

XIDs sent
XIDs rcvd

XIDs that this DLSw peer has sent and received from the remote DLSw peer.

Datagrams sent
Datagrams rcvd

 Datagrams that this DLSw peer has sent and received from the remote DLSw peer.

Info frames sent
Info frames rcvd

 I-frames that this DLSw peer has sent and received from the DLSw peer.

RIF

 The information that is included in the RIF of the LLC test frame.

dls session ip

Displays IP session information.

Example: list dls session ip

Source         Destination        State     Dest.IP Addr    Id
1.400000000003  500000000003 04  Connected  128.185.236.51   1

dls sessions nb

 Lists information about the current active circuits that support NetBIOS.

Example: list dls sessions nb

Source             Destination     State   Flags Dest. IP Addr       Id
1. 0000C91373C1 F0   0003152CCCE6 F0    Connected           128.185.236.245     92

dls session range

The range of DLS sessions that you want to display. This number is located to the left of the source MAC address.

Example: list dls session range

Start [1]?
Stop  [1]?
  
Source             Destination        State      Dest. IP Addr  Id
1.400000000003     500000000003 04   Connected   128.185.236.51 2

dls session src

Displays all DLSw session information by source MAC Address.

Example: list dls session src

Source MAC Address [400000000001]? 

Source      Destination     State       Flags  Dest. IP Addr    Id
1. SDLC 04  400000000002 04  Connected          10.1.49.401       1
Note: In this example source MAC address 400000000002 maps to the "SDLC 04" name. If you do not know the source MAC address, enter list sdlc config all to obtain it.

dls session state

 Displays all DLSw sessions in the specified state. The DLSw session states are defined as follows:

Example: list dls session state

DISCONECT = 0,     RSLV_PEND = 1
CIRC_PEND = 2,     CIRC_EST  = 3
CIR_RSTRT = 4,     CONN_PEND = 5
CONT_PEND = 6,     CONNECTED = 7
DISC_PEND = 8,     HALT_PEND = 9
REST_PEND = 10

Enter state value (0-10) [7]? 


Source           Destination          State   Flags Dest. IP Addr  Id
1.		400000000003 04	10005AF181A4 04    Connected      128.185.236.84  0
2.		400000000002 04	400000000088 04    Connected      128.185.236.84  1

dls cache all

 Lists the entries in the DLSw MAC address cache. This cache contains a database of the most recent MAC address to IP neighbor translations. It provides the MAC address, time to live (in seconds) in the cache, and the neighbor's IP address.

Example: list dls cache all

		Mac Address    Secs to live   IP Address(es)     Largest Frame
1.   10005AF1809B  810            128.185.236.84     1470
2.   10005AF181A4  1170           128.185.236.84     2052
3.   400000000088  1170           128.185.236.84      2052

dls cache range

 Displays information for a specified range of cache entries.

Example: list dls cache range

Start[2]?  
Stop[2]?  
    Mac Address       Secs to live   IP Address(es)     Largest Frame
2.  10005AF181A4      1170           128.185.236.84        2052

dls memory

 Lists all existing DLSw sessions and the amount of memory in use by each session. It also displays the following flow control states.
Ready

 The session is not congested.

Session

 The session has used most of its session allotment and probably has flow controlled the data link.

Global

 The session is congested due to a shortage of memory in the router.

The currently in use field shows the total amount of memory currently allocated by DLS. This includes all session allocations, control messages and TCP receive buffers.

Note: To change the memory allocation use the set memory command.

Example: list dls memory

Total DLSw bytes requested:             141056
Global receive pool bytes granted:       84633
  Currently in use:                          0
Global transmit pool bytes granted:      56423
  Currently in use:                        232

No active sessions

groups

 Displays information for all configured groups to which the router belongs.

Example: list groups

Group  Role   Xmit Bufsize  Rcv Bufsize Max Segsize Keepalive Priority
 1     CLIENT 5120         5120           1024      DISABLED    MEDIUM
Group

 Number of the group.

Role

 Type of group.

Xmit Bufsize

 Size of the TCP transmit buffer in the range of 1024 and 32768. The transmit buffer size must be at least twice the maximum segment size. Default is 5120.

Rcv Bufsize

 Size of the TCP receive buffer in the range of 1024 and 32768. The receive buffer size must be at least twice the maximum segment size. Default is 5120.

Max Segsize

 Maximum size of the TCP segment, in the range of 64 and 16384. The default is 1024.

Keepalive

 The status of the keepalive functionality, enabled or disabled.

Priority

 Displays the priority of the DLSw group as either High, Medium, or Low.

llc2 open

Displays information that pertains to LLC2. The options (open SAPs, SAP parameters, and sessions) for LLC2 are described below and on the following pages.

Open

Displays information for all currently open SAPs on interfaces between LLC2 peers.

Example: list llc2 open 

Interface   SAP
    0       0
    0       4

llc2 sap

 Displays LLC2 parameter configuration information. Only configurations that were changed are displayed. If you did not use the set llc2 command, no output is generated.

Example: list llc2 sap 

SAP  T1    t2    ti    n2    n3    tw    rw    nw    acc

llc2 sessions all

 Displays current information for all LLC2 sessions.

Example: list llc2 sessions all

   SAP  Int.	Remote Addr	   Local Addr         State	       	RIF
1. 04  6   400000000003  500000000003   CONTACTED   0620 0202 B0B0
State

The state of the llc session. The following states can be displayed:

Disconnected— Indicates the data link control structure exists but no data link is established.

Connect_pend— The connect pending state is entered when a test command frame to NULL SAP is received or when a DLC_START_DL command is received from DLSw.

Resolve_pend— The resolve pending state is entered when a DLC_RESOLVE_C command has been sent to DLSw.

Connected— This is a steady state where LLC Type 1 level services are available through the DLSw cloud. This state is entered when a DLC_RESOLVE_R command is received from DLSw or when a TEST response frame is received from the network.

Contact_pend— This state is entered whenever a response to a transmitted or received SABME is outstanding.

Disconnect_Pending—
This state is entered whenever a DISC command has been transmitted or received, or a DLC_HALT has been received from DLSw.

Contacted— In an active DLSw session, you can pass data on the session. This is the normal operating state.

llc2 sessions range

Displays current information for the selected range of LLC2 sessions.

Example: list llc2 sessions range

Start[1]?  
Stop[1]? 
 
   SAP  Int.  Remote Addr       Local Addr     State     RIF
1. 04   6      400000000003      50000000000    Contacted  0620 0202 B0B0

sdlc sessions

 Displays information about all SDLC DLS sessions within the router.

Example: list sdlc sessions

NET  Addr. Source SAP  Dst SAP    Dest Mac         InQ  OutQ  State
1. 2    C1 04          04     40:00:00:00:00:02     00    00   Contacted

sdlc config

Displays configured parameters for the SDLC attached PU.

Example: list sdlc config

Interface #, or 'ALL' [0]? 5
Net  Addr   Status    Idblk  Idnum   Source SAP/MAC    Dest SAP/MAC
 5    C1    Enabled    000   00000   04 4018997E05C1   04 401AAB9200C1

tcp capabilities

 Displays the information received from a partner DLSw router in the capabilities exchange message.

Example: list tcp capabilities

Enter the DLSw neighbor IP Address [0.0.0.0]? 1.1.1.2
Vendor ID:                  0000C9
Vendor version:             Netrix (tm) 5.2 
Initial pacing window:      12
Preferred TCP connections:  1
Supported SAPs:             00 04 08 0C

tcp config

Displays information on all configured TCP sessions.

Example: list tcp config

Neighbor       Xmit Bufsize  Rcv Bufsize MaxSegsize Keepalive Priority
128.185.122.234  5120              5120       1024      DISABLED   MEDIUM

tcp sessions

Displays the version, the number of currently active DLSw sessions using this TCP session, and the number of DLSw sessions that have ever used this TCP session.

Example: list tcp sessions

Group   IP Address  Conn State     Version    Active Sess  SessCreates
1       1.1.1.1     ESTABLISHED    AIW V1R0    2            4

tcp statistics

 Displays statistics on the use of TCP sessions.

Example: list tcp statistics

Enter the DLSw neighbor IP Address [0.0.0.0]? 1.1.1.1

                                     Transmitted           Received
                                     -----------          -----------
Data Messages                            217                  314
Data Bytes                             31648                43796
Control Messages                          64                   74
CanYouReach Explorer Messages              6                    0
ICanReach Explorer Messages                0                    4
NameQuery Explorer Messages                0                    0
NameRecognized Explorer Messages           0                    0

NetBIOS [C] [M]

 Displays the NetBIOS configuration or monitoring prompt. See Bridging in the Online Library for more information on the commands available at this prompt.

Syntax: netbios

Example: netbios

NetBIOS Support User Configuration

NetBIOS config>

Open-Sap [C] [M]

 Enables DLSW to transmit data for the specified link SAP.

You should execute open-sap on the router that resides on the session initiator side of the connection. For example, if the client is always the sessions initiator, you need to open the SAPs only on the client side router. If you are unsure which side initiates the connection, open the SAPs on both sides. The commonly used SNA SAP values are 04, 08, and 0C. NX Networks recommends that you open 04, 08, and 0C on all participating DLSw routers.

Syntax: open-sap

Example: open-sap

Interface # [0]?
Enter SAP in hex (range 0-F4), 'SNA', 'NB' or 'LNM' [4]? lnm
SAP F4 opened on interface 0
Interface #

 The number of the interface over which you want to open the SAP.

Enter SAP in hex

You can enter individual SAPs in hex, or you can enter SNA, NB (NetBIOS), or LNM.

If you enter SAPs in hex, the range is 0 to F4, and the SAP must be an even number.

Set [C] [M]

Configures the size of the MAC address-to-IP address mapping cache, LLC2 parameters, maximum number of DLSw sessions, SRB segment number, protocol timers, and TCP receive buffer size.

Set [C]

Syntax: set

cache
llc2
maximum
memory
srb
timers
priority

cache size

 Lets you specify the size of the MAC address-to-IP address mapping cache.

DLSw uses information stored in this cache to discover routes to remote stations. Thus, the larger the cache, the better the chances of DLSw finding a desired remote station without broadcasting CANUREACH frames to all known TCP/IP neighbors.

Nonetheless, it is wise to avoid setting this cache size too large. Doing so consumes memory in the router. The effect is a reduction in the number of DLSw sessions the router can handle.

Example: set cache 

MAC <-> IP cache size (4 - 65535) [128]?

llc2

 Allows you to configure specific LLC2 attributes for a specific SAP.

Example: set llc2 

Enter SAP in hex (range 0-FE)  [0]? 
Reply timer (T1) in sec. [1]?
Receive Ack timer (T2) in 100 millisec. [1]?
Inactivity Timer (Ti) in sec. [30]?
Transmit Window (Tw), 1-128, 0=default [2]?
Receive Window (Rw), 127 Max [2]?
Acks needed to increment Ww (Nw) [1]?
Max Retry value (N2) [8]?
Number I-frames received before sending ACK (N3) [1]?
Enter SAP in hex

 The SAP number that you want to tune. Values in the range of 0 - FE.

Reply timer (T1)

 This timer expires when the LLC2 neighbor fails to receive a required acknowledgment or response from the other LLC2 neighbor.

Receive Ack timer (T2)

Inactivity Timer (Ti)

 The delay it takes to send an acknowledgment for a received I-format frame in milliseconds.

This timer expires when the LLC does not receive a frame for a specified time period. When this timer expires, the LLC2 neighbor transmits an RR until the LLC2 neighbor responds or the N2 retry count is exceeded. Default is 30 seconds.

Transmit Window
(Tw)

 The maximum number of I-frames that can be sent before receiving an RR. Values in the range 1 - 127. 0 sets Tw to the default. Default is 2.

Receive Window (Rw)

 The maximum number of unacknowledged sequentially numbered I-frames that an LLC2 neighbor can receive from a remote host.

Acks needed to increment Ww (Nw)

 The working window (Ww) is a dynamically changing shadow of the transmit window (Tw). After an LLC error is detected, the working window (Ww) is reset to 1. The Acks needed to increment Ww value specifies the number of acks that the station must receive before incrementing Ww by 1. The Ww continues to be incremented in this fashion until Ww = Tw.

Max Retry value (N2)

 The maximum number of times the LLC2 neighbor transmits an RR without receiving an acknowledgment when the inactivity timer (Ti) expires.

Number I-frames received before sending ACK (N3)

 The value used with the T2 timer to reduce acknowledgment traffic for received I-frames. This counter is set to a specified value and decrements each time an I-frame is received. When this counter reaches 0 or the T2 timer expires, an acknowledgment is sent. The default is 1. To ensure good performance, set N3 to a value less than the remote LLC's Tw.

maximum #-of-sessions

Sets the maximum number of DLSw sessions that the DLSw protocol can support.

Example: set maximum 

Maximum number of DLSw sessions (1-60000) [1000]?

memory

Allows you to specify the total amount of memory allocated to DLSw, and the total amount of memory to be allotted to each DLSw session.

Example: set memory 

Number of bytes to allocate for DLSw (at least 26368) [141056]? 
Number of bytes to allocate per LLC session [8192]? 
Number of bytes to allocate per SDLC session [4096]? 
Number of bytes to allocate for NetBIOS UI-frames [40960]?
The default for the number of bytes to allocate to DLSw is probably too low to be useful for more than a small number of DLSw sessions. Raise the memory value depending on the anticipated number of DLSw sessions, TCP neighbors, and the amount of memory available in the router.

The maximum memory required by a single session is approximately the following:

session_allocation * number_of_sessions * 75%

Adjust this number to 80-85% if the data stream includes many small packets.

Each TCP connection to a DLSw neighbor requires roughly 512 bytes.

For example, assuming 8K per LLC session and 4K per SDLC session, a total of 100 DLSw sessions (20 SDLC and 80 LLC) through a combination of 4 DLSw neighbors requires approximately

(20 * 4K * 75%) + (80 * 8K * 75%) + (4 * 512) = 555,008 bytes.

If you anticipate many small packets, then

(20 * 4K * 85%) + (80 * 8K * 85%) + (4 * 512) = 628,736 bytes.

At no point does bad judgment in determining the DLSw allocation result in lost data. In general, the more memory allocated to DLSw, the better the overall DLSw performance. When DLSw runs out of memory, an ELS message, DLS.161 (Entering GLOBAL congestion on global DLS pool) is generated. It is okay for these messages to appear occasionally. If they appear very often, consider increasing the DLSw allocation value.

srb segment-number

Sets the Source Routing Bridge (SRB) segment number that identifies DLSw on Token Ring networks. Specify the segment number as a three-digit hexadecimal value.

Example: set srb 

Enter segment number hex (1-FFF) [5]?

timers

 Sets the DLSw protocol timers.

Example: set timers

Database age timer (1-1000 secs. Decimal) [1200]?
Max wait timer ICANREACH (1-1000 secs Decimal) [20]?
Wait timer LLC test response (1-1000 secs. Decimal) [15]?
Wait timer SDLC test response (1-1000 secs. Decimal) [15]?
Group join timer interval (1-60000 secs. Decimal) [15]?
Neighbor priority wait timer (1.0-5.0 secs. Decimal) [5.0]?
Database age timer

 How long to hold unused DLSw database entries. Database entries map destination MAC addresses into the set of DLSw neighbors that can reach them.

Max wait timer ICANREACH

 How long to wait for an ICANREACH response for a previously transmitted CANUREACH.

Wait timer LLC test response

 How long to wait for an LLC test response before giving up.

Wait timer SDLC test response

 How long to wait for an SDLC test response before giving up.

Group join timer interval

The group interval timer is significant when you configure a pair of DLSw routers to use a TCP group with the join command, rather than statically configuring each router with the adjacent IP address of its DLS neighbor using the add tcp command.

When you use set timer from the DLSw> prompt, you are prompted for a group update interval value. When the router is first powered up, it sends group packets every 15 seconds or the configured group update interval, whichever is smaller, for the first 6 transmissions, and then the configured time thereafter.

If an IP router between two partner DLSw routers goes down, the attempt to re-establish the TCP connection takes place once the configured group update interval value has elapsed after the IP router has recovered. If the configured value is 15 seconds, then the attempt to re-establish the TCP connection takes place 15 seconds after the recovery of the IP router is detected.

The range is 1 to 60000 seconds in decimal. The default is 900 seconds.

Neighbor priority wait timer

 Amount of time (in seconds) to wait during exploration before selecting a neighbor.

priority

Lets you specify the circuit priorities to use for SNA circuits and NetBIOS circuits. You can use this command to specify circuit priority as Critical, High, Medium, or Low. Note that you must assign circuit priorities in descending order from Critical to Low.

The router uses the priority value you assign to selectively limit the burst-length of specific types of traffic. For example, if you assign SNA traffic a priority of Critical and NetBIOS traffic a priority of Medium, with a message allocation of 4/3/2/1, the router processes 4 SNA frames before it processes 2 NetBIOS frames. After the router processes 2 NetBIOS frames, it processes 4 SNA frames, and so on. In this scenario, two thirds of available bandwidth is dedicated to SNA traffic (a ratio of 4 to 2). Note that the router counts frames, rather than bytes, when allocating bandwidth according to the priorities you assign.

You can also use this command to set the maximum frame size to use for NetBIOS. Set this parameter to the largest frame size you expect to need, and no larger. Setting the frame size larger than needed reduces the number of available buffers.

Example: set priority

Priority for SNA DLSw sessions (C/H/M/L) [M]?
Priority for NetBIOS DLSw sessions (C/H/M/L) [M]?
Message allocation by C/H/M/L priority (4 digits) [4/3/2/1]?
Maximum NetBIOS frame size (516, 1470, 2052, or 4399) [2052]?

Set [M]

 Syntax: set

llc2
memory
priority
timers

llc2

Allows you to configure specific LLC2 attributes for a specific SAP.

Example: set llc2 

Enter SAP in hex (range 0-F4)  [0]? 
Reply timer (T1) in sec. [1]?
Receive Ack timer (T2) in 100 millisec. [1]?
Inactivity Timer (Ti) in sec. [30]?
Transmit Window (Tw), 1-128, 0=default [2]?
Receive Window (Rw), 127 Max [2]?
Acks needed to increment Ww (Nw) [1]?
Max Retry value (N2) [8]?
Number I-frames received before sending ACK (N3) [1]?
Reply timer (T1)

 This timer expires when the LLC2 neighbor fails to receive a required acknowledgment or response from the other LLC2 neighbor.

Receive Ack timer (T2)

 The delay it takes to send an acknowledgment for a received I-format frame in milliseconds.

Inactivity Timer (Ti)

 This timer expires when the LLC does not receive a frame for a specified time period. When this timer expires, the LLC2 neighbor transmits an RR until the LLC2 neighbor responds or the N2 retry count is exceeded. Default is 30 seconds.

Transmit Window
(Tw)

 The maximum number of I-frames that can be sent before receiving an RR. Values in the range 1 - 127. 0 sets Tw to the default. Default is 2.

Receive Window (Rw)

 The maximum number of unacknowledged sequentially numbered I-frames that an LLC2 neighbor can receive from a remote host.

Acks needed to increment Ww (Nw)

 The working window (Ww) is a dynamically changing shadow of the transmit window (Tw). After an LLC error is detected, the working window (Ww) is reset to 1. The `Acks needed to increment Ww' value specifies the number of acks that the station must receive before incrementing Ww by 1. The Ww continues to be incremented in this fashion until Ww = Tw.

Max Retry value (N2)

 The maximum number of times the LLC2 neighbor transmits an RR without receiving an acknowledgment when the inactivity timer (Ti) expires.

Number I-frames received before sending ACK (N3)

 The value used with the T2 timer to reduce acknowledgment traffic for received I-frames. This counter decrements each time an I-frame is received. When this counter reaches 0 or the T2 timer expires, an acknowledgment is sent. Default is 1.

memory

Specifies the total amount of memory allocated to DLSw and the total amount of memory to be allotted to each DLSw session. This command affects only new DLSw sessions.

Example: set memory 

Number of bytes to allocate for DLSw (at least 26368) [141056]? 
Number of bytes to allocate per LLC session [8192]? 
Number of bytes to allocate per SDLC session [4096]? 
Number of bytes to allocate for NetBIOS UI-frames [40960]? 
The SDLC and LLC allocations will affect new sessions only
Note that the default value offered for the number of bytes to allocate to DLSw is probably too low to be useful for more than three to four DLSw sessions. You should raise the memory value depending on the anticipated number of DLSw sessions, TCP neighbors, and the amount of memory available in the router.

The maximum memory required by a single session is approximately the following:

session_allocation * number_of_sessions * 75%

This number should be adjusted to 80-85% if the data stream includes many small packets.

Each TCP connection to a DLSw neighbor requires roughly 512 bytes.

For example, assuming 8K per LLC session and 4K per SDLC session, a total of 100 DLSw sessions (20 SDLC and 80 LLC) through a combination of 4 DLSw neighbors requires approximately

(20 * 4K * 75%) + (80 * 8K * 75%) + (4 * 512) = 555,008 bytes.

If many small packets are anticipated, then

(20 * 4K * 85%) + (80 * 8K * 85%) + (4 * 512) = 628,736 bytes.

At no point will bad judgment in determining the DLSw allocation result in lost data. In general, the more memory allocated to DLSw, the better the overall DLSw performance. When DLSw runs out of memory, it generates ELS message DLS.161 (Entering GLOBAL congestion on global DLS pool). It is okay for these messages to appear occasionally. If they appear very often, then consider increasing the DLSw allocation value.

priority

Lets you specify the circuit priorities to use for SNA circuits and NetBIOS circuits. You can use this command to specify circuit priority as Critical, High, Medium, or Low. Note that you must assign circuit priorities in descending order from Critical to Low.

The router uses the priority value you assign to selectively limit the burst-length of specific types of traffic. For example, if you assign SNA traffic a priority of Critical and NetBIOS traffic a priority of Medium, with a message allocation of 4/3/2/1, the router processes 4 SNA frames before it processes 2 NetBIOS frames. After the router processes 2 NetBIOS frames, it processes 4 SNA frames, and so on. In this scenario, two thirds of available bandwidth is dedicated to SNA traffic (a ratio of 4 to 2). Note that the router counts frames, rather than bytes, when allocating bandwidth according to the priorities you assign.

You can use this command to set the maximum frame size to use for NetBIOS. Set this parameter to the largest frame size you expect to need, and no larger. Setting the frame size larger than needed reduces the number of available buffers.

Example: set priority

Priority for SNA DLSw sessions (C/H/M/L) [M]? 
Priority for NetBIOS DLSw sessions (C/H/M/L) [M]? 
Message allocation by C/H/M/L priority (4 digits) [4/3/2/1]? 
Maximum NetBIOS frame size (516, 1470, 2052, or 4399) [2052]?

timers

 Sets the DLSw protocol timers.

Example: set timers

Database age timeout (1-10000 secs. Decimal) [1200]? 
Max wait timer ICANREACH (1-1000 secs. Decimal) [30]? 
Wait timer LLC test response (1-1000 secs. Decimal) [15]? 
Wait timer SDLC test response (1-1000 secs. Decimal) [15]? 
Group join timer interval (1-60000 secs. Decimal) [900]? 
Neighbor priority wait timer (1.0-5.0 secs. Decimal) [5.0]?
Database age timeout

 How long to hold unused DLSw database entries. Database entries map destination MAC addresses into the set of DLSw neighbors that can reach them.

Max wait timer ICANREACH

 How long to wait for an ICANREACH response for a previously transmitted CANUREACH.

Wait timer LLC test response

 The length of time to wait for an LLC test response before giving up.

Wait timer SDLC test response

 The length of time to wait for an SDLC test response before giving up.

Group join timer interval

 The group interval timer is significant when you configure a pair of DLSw routers to use a TCP group with the join command, rather than statically configuring each router with the adjacent IP address of its DLSw neighbor using the add tcp command. When you use set timer from the DLSw> prompt, the router prompts you for a group update interval value.

When you first power up the router, it sends group packets every 15 seconds or the configured group update interval, whichever is smaller, for the first 6 transmissions, and then the configured time thereafter.

If an IP router between two partner DLSw routers goes down, the attempt to re-establish the TCP connection takes place once the configured group update interval value has elapsed after the IP router has recovered. If the configured value is 15 seconds, then the attempt to re-establish the TCP connection takes place 15 seconds after the recovery of the IP router is detected. The range is 1 to 60000 seconds in decimal. The default is 900 seconds (15 minutes).

Neighbor priority wait timer

 Specifies the amount of time DLSw waits before selecting a neighbor.

Exit [C] [M]

Use the exit command to return to the Config> or Monitor> prompt.

Example: exit


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