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Chapter 11

Configuring and Monitoring LAN Network Manager (LNM)

This chapter describes Proteon's ASRT implementation of the LAN Network Manager (LNM). It includes the following sections:

About LNM

Configuring LNM

LNM Commands

About LNM

LNM lets you manage Token Ring networks interconnected by source route bridges. It lets you monitor the operation of rings, bridges and individual ring stations.

Information collected by software agents on the bridge is available to LNM management stations. More specifically, LNM agents forward collected information via another agent called the LAN Reporting Mechanism (LRM), a proprietary IBM protocol. Information forwarding is done via an LLC2 connection to a LAN Network Manager station.

LNM Agents and Functions

The LNM agents and their functions include the following:

Figure 11-1 illustrates the connection between the Proteon bridge, LNM agents, and the IBM LNM station.

Figure 11-1 LNM Station and Agents

The following sections describe each LNM agent in more detail.

Configuration Report Server

At the request of LNM, CRS obtains and forwards ring station status to LNM. You can also use CRS to set ring station parameters and remove a station from the ring.

Configuration information generated by ring stations is forwarded to LNM. When LNM requests the status of a ring station, CRS builds and sends MAC frames to the station to obtain the information. CRS then sends the following to the ring station:

When the ring station replies, CRS puts the information into a properly formatted LLC2 frame and forwards it to LNM.

CRS can also remove a ring station from the ring at the request of LNM. To remove a ring station, CRS sends a Remove Station MAC frame to the ring. CRS also returns a response to LNM indicating the success or failure of the removal.

When CRS receives a Report New Active Monitor MAC frame, it forwards the information to LNM. When a Report NAUN (Next Active Upstream Neighbor) Change MAC frame is received, this information is also reported. The CRS agent has its own functional address that ring station MAC layers can use to forward MAC frames to CRS.

Ring Parameter Server

RPS inserts ring stations onto the ring. When a ring station is newly inserted into the ring the following occurs:

The RPS function has an associated functional address for receiving the MAC frames that other ring stations send to it.

Ring Error Monitor

REM observes the operation of the attached Token Ring by looking for hard errors and soft errors. It then reports these to LRM and aids in isolating the cause of the errors. It does the following during hard error detection:

REM monitors soft errors as follows:

LAN Reporting Mechanism

 LRM controls the connection of LNM to the agents. LRM establishes reporting links between itself and each connected LNM. A reporting link is an LLC2 connection between LNM and LRM.

All communication between LNM and the agents is done via a reporting link. LRM passes management data to and from the appropriate agents to the reporting links. Up to four reporting links are supported. One is designated the controlling link and the other three are designated as observing links.

An LNM connected via the controlling link can perform all available operations. LNMs connected by observing links can perform only a limited subset of the available operations.

LNM Configuration Restrictions

The following restrictions apply to the LNM software:

Logical Link Class 2 Support

 In LANs, the data link layer comprises two sublayers: the Medium Access Control (MAC) and the Link Layer Control (LLC). LLC provides two types of service:

LAN Network Manager (LNM) requires LLC2 connection-oriented services. LLC2 provides capabilities for the following:

The LLC sublayer conforms to the IEEE 802.5 standard.

Configuring LNM

This section summarizes the procedure necessary for basic configuration of the LNM feature.

1. Obtain the MAC address required for network manager software running on the Network Manager Station. Enter list lnm ports at the ASRT> prompt.

ASRT>list lnm ports
Port Number [1]? 1
Port 1
LNM Agents Enabled: RPS CRS REM
Reporting Link          State          LNM Station Address
      0                 ACTIVE         10:00:5A:F1:02:37
      1                 AVAILABLE      
      2                 AVAILABLE      
      3                 AVAILABLE      
MAC Addresses to use when configuring LNM Manager:
      00:00:C9:08:35:47
      40:00:D9:08:35:47

LNM not enabled on port 4 
LNM not enabled on port 5
The Network Manager uses the MAC addresses displayed to configure it to the LNM agents present in the router.

Note: Enter these addresses exactly as they appear in the output or LNM will not configure correctly.

2. Enable the LNM agents on the router. Enter enable lnm at the LNM config> prompt to enable the LNM agents on the desired port.

LNM config>enable lnm
Port Number [1]? 1
The default setting has all LNM agents enabled.

3. Check the configuration by displaying enabled LNM agents. Enter list port at the LNM config> prompt to display which LNM agents are enabled on your configured port. 

LNM config>list port
Port Number [1]? 1

LNM Agents Enabled: RPS CRS REM

LNM Commands

This section describes the LNM configuration and monitoring commands. These commands allow you to configure and monitor network parameters for the LNM.

Enter configuration commands at the LNM config> prompt. Display this prompt as follows:

Config>protocol asrt
Adaptive Source Routing Transparent Bridge user configuration
ASRT config>lnm
LNM configuration
LNM config>
Enter monitoring commands at the LNM> prompt. Display this prompt as follows:

ASRT>lnm
LNM>
Table 11-1 lists the LNM commands.

Table 11-1 LNM Commands
Command Task Function

?(Help) Configure/Monitor Lists all of the LNM commands or the options associated with specific commands.
Disable Configure Disables all LNM agents or specified LNM agents (RPS, CRS, or REM) on a specified port. Disables the setting of certain LNM parameters from the remote LNM application linked to the bridge. Applies globally to all instances of LNM within the bridge.
Enable Configure Enables all LNM agents or specified LNM agents (RPS, CRS, or REM) on a specified port. Enables the setting of certain LNM parameters from the remote LNM application linked to the bridge. Applies globally to all instances of LNM within the bridge.
Exit Configure/Monitor Returns to the previous prompt.
List Configure/Monitor Displays the LNM agents that are enabled for the specified port. Displays the passwords configured for the bridge.
Set Configure Sets the password for the specified reporting link number.

? (Help) [C] [M]

Lists available commands or options.

Syntax: ?

Example: list ?

Disable C

Disables all LNM agents on a port or disables specified LNM agents (CRS, REM, or RPS) on a port.

If the port is not configured then the message LNM not configured for Port XX is displayed. If this is the case, the command has no effect.

This command also disables the setting of the reporting link passwords from the remote LNM application linked to the bridge.

Syntax: disable

crs (Configuration Report Server)
rem (Ring Error Monitor)
rps (Ring Parameter Server)
lnm
configuration-remote-change

crs port#

Disables the LNM agent CRS on the specified port.

Example: disable CRS 

Port Number [1]? 3

rem port#

Disables the LNM agent REM on the specified port.

Example: disable REM 

Port Number [1]? 3
Already Disabled

rps port#

Disables the LNM agent RPS on the specified port.

Example: disable RPS 

Port Number [1]? 3

lnm port#

Disables LNM on the specified port. If the port is not configured, the message LNM not configured for Port XX appears and the command has no effect.

If none of the LNM agents are enabled for the specified port, the message LNM not configured for Port XX appears.

Example: disable lnm

Port Number [1]? 1
LNM not configured for Port 1

configuration-remote-change

Disables the setting of the reporting link passwords from the remote LNM application linked to the bridge. This command applies globally to all instances of LNM within the bridge.

Example: disable configuration-remote-change

CONFIGURATION-REMOTE-CHANGE: Disabled

Enable C

Enables all LNM agents on a specified port or enables specified LNM agents (CRS, REM, or RPS) on a specified port.

If the interface is not a Token Ring, the message Port number XX is not token ring appears.

If the port is not configured, the message Port number XX does not exist appears.

If the specified agent is already enabled for the specified port, the message Already enabled appears.

This command also enables the setting of the reporting link passwords from the remote LNM application linked to the bridge.

Syntax: enable

crs (Configuration Report Server)
rem (Ring Error Monitor)
rps (Ring Parameter Server)
lnm
configuration-remote-change

crs port#

Enables the LNM agent CRS on the specified port.

Example: enable CRS 

Port Number [1]? 10
Port number 10 does not exist

rem port#

Enables the LNM agent REM on the specified port.

Example: enable REM 

Port Number [1]? 3
Already Enabled

rps port#

Enables the LNM agent RPS on the specified port.

Example: enable RPS 

Port Number [1]? 1
Port number 1 is not Token Ring

lnm port#

Enables all LNM agents on the specified port.

If the port is not configured, the message Port number XX does not exist appears.

If the specified agent is already enabled for the port the message Already Enabled appears.

Example: enable lnm 

Port Number [1]? 1

configuration-remote-change

Enables the setting of the reporting link passwords from the remote LNM application linked to the bridge. The default disables the setting of LNM configuration parameters remotely. This command applies globally to all instances of LNM within the bridge.

Example: enable configuration-remote-change

CONFIGURATION-REMOTE-CHANGE: Enabled

Exit C M

Use the exit command to return to the ASRT prompt.

Syntax: exit

Example: exit

List C M

Displays the LNM agents enabled for the specified port, and also displays passwords that have been configured for the bridge.

List C

Syntax: list

password
port

password

Displays the passwords that have been configured for the reporting links of the bridge. Displays whether or not the passwords may be changed by the remote LNM application.

Example: list password 

Reporting Link     Password
     0             87654321
     1             MADRAS  
     2             ABC1234 
     3             123ABC  
CONFIGURATION-REMOTE-CHANGE: Disabled

port port#

Displays the LNM agents enabled for the specified port if the port is a Token Ring port supporting Source Routing Bridging.

Example: list port 

Port Number [1]? 1
LNM Agents Enabled: RPS CRS REM

List M

Syntax: list

bridge
LNM ports
source-routing configuration

bridge

Displays whether LNM is enabled on a specific port.

Example: list bridge

Bridge ID (prio/add): 32768/00-00-00-00-00-38
Bridge state: Enabled
UB-Encapsulation: Disabled
Bridge type: SR-TB
Bridge capability: ASRT
Number of ports: 5
STP Participation: IEEE802.1d on TB ports and IBM-8209 on SR ports
Maximum
Port Interface State MAC Address Modes MSDU Segment Flags
1 FDDI/0 Up AA-00-04-00-26-14 T 4491 RD
2 TKR/0 Up 00-00-93-90-4C-F7 T 2096 RD
3 TKR/1 Down 00-00-00-00-00-00 SR 0 223 RD,LE
4 FDDI/1 Down 00-00-00-00-00-00 T 0 RD
5 Eth/0 Down AA-00-04-00-26-14 0 RD

Flags:RE =IBMRT PC behaviour Enabled, RD = IBMRT PC behaviour Disabled
LE = LNM Enabled, LD = LNM Disabled, LF = LNM Failed

SR bridge number: 8
SR virtual segment: 812
Adaptive segment: 214

lnm ports

Displays the configuration of the LNM ports.

Example: list lnm ports

LNM not enabled on port 1 
LNM not enabled on port 2 
Port 3
LNM Agents Enabled: RPS CRS REM
Reporting Link          State          LNM Station Address
      0                 AVAILABLE      
      1                 AVAILABLE      
      2                 AVAILABLE      
      3                 AVAILABLE      
MAC Addresses to use when configuring LNM Manager:
      00:00:00:00:00:00
      00:00:00:00:00:00
LNM not enabled on port 4 
LNM not enabled on port 5

source-routing configuration

Displays whether LNM is enabled on a specific port.

Example: list source-routing configuration

Bridge number:               8
Bridge state:                Enabled
Maximum STE hop count        14
Maximum ARE hop count        14
Virtual segment:             812

Port  Segment  Interface  State   MTU    STE Forwarding   LNM
   3  223      TKR/1     Enabled  4399   Auto            ENA
   -  214      Adaptive  Enabled  1470   Yes

Set C

Sets the password for the specified reporting link number. The link number can be 0, 1, 2 or 3. Link 0 is used for the controlling link. Links 1, 2, and 3 are used for observing links.

The password should consist of six to eight characters, and must match the password used by LNM when it establishes a reporting link with the bridge. If you do not set the password, it defaults to the string 00000000.

Syntax: set password link# password

Example: set password

Link Number [0]? 1
Enter new password :  [ABCDEFGH]? guesswho

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