Figure 1 LNM Station and Agents
This document describes 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:
Configuration Report Server (CRS) reports ring topology changes and ring station status to LNM.
Ring Parameter Server (RPS) services requests from ring stations for ring parameter information including ring number, the soft error report timer value, and the physical location.
Ring Error Monitor (REM) collects error reports from ring stations and analyzes them. When thresholds are exceeded, REM may forward error information to LNM.
LAN Reporting Mechanism (LRM) controls the establishment of reporting links from LNM stations to the bridge agents. Also manages the transfer of information to and from the other agents over these links.
Figure 1 LNM Station and Agents
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:
Request Ring Station Address MAC frame
Request Ring Station State MAC frame
Request Ring Station Attachments MAC frame
The new station sends a Request Initialization MAC frame to RPS for that ring. This MAC frame includes some information about the station.
RPS responds with an Initialize Ring Station MAC frame containing the ring number and the interval of time to wait between sending Report Soft Error MAC frames. The information gleaned from the Request Initialization frame is passed to LNM so that it may maintain a database of all ring stations on the ring.
RPS also responds to a request for status from LNM. The ring number, RPS version information and the soft error report timer value are returned to LNM.
Hard errors are detected on the ring by the receipt of Beacon MAC frames.
Stations in the fault domain attempt to correct the problem by possibly removing themselves from the ring.
REM determines if the hard error condition is corrected or not and then reports the results to LNM.
Ring stations periodically send Soft Error MAC frames to REM to inform it of the number of times various intermittent faults, for example, CRC errors and frequency errors occur.
When the number of soft errors for a station a certain threshold, REM reports this condition to LNM.
REM also monitors the Report Soft Error MAC frames for receiver congestion conditions. Receiver congestion indicates that a ring station discarded frames due to a shortage of receive buffers.
If the number of times a station reports receiver congestion exceeds a certain threshold, REM reports this condition to LNM. When the receiver congestion condition returns to normal, LNM is notified that the receiver congestion condition has ended.
The following platforms support multiport Token Ring and two Token Ring configurations: DNX 300, CNX 500, CNX 600, and RBX Series.
The LNM agent and the LNM station always assume that messages are being passed on a two-port model. LNM is enabled, however, on a per bridge port basis to be consistent with the existing Proteon configuration.
This is what is meant by a multiport configuration. LNM can be enabled on any source-routing Token Ring bridge port. In other words, an instance of LNM is created for each port upon which LNM is enabled.
With the exception of a two Token Ring configuration, the other port in a two-port model is always designated by a bogus address. This address corresponds to something that is not a real Token Ring interface. It can correspond to a virtual ring or a serial interface.
Only in the case where the Proteon bridge has two source-routing Token Ring ports is the other port in the two-port model bridge a Token Ring with a real address.
To obtain the MAC addresses needed to configure the LNM Manager, enter list lnm ports.
LBS (LAN Bridge Server) can report packets-forwarded and packets-discarded performance data statistics when requested by the manager station. Remote configuration updates from the manager station are not supported.
The Proteon LNM supports the IBM LAN Network Manager 1.1 and 2.0 products.
LLC1 (Type 1) - an unacknowledged connectionless service
LLC2 (Type 2) - a set of connection-oriented service
Initiating new data link connections
Managing data link connections
Exchanging data in sequential order (in a guaranteed fashion)
Executing a level of flow control on the established connections
Terminating link connections upon request from the service user or unrecoverable link errors.
Enter list lnm ports at the Bridge> prompt.
Bridge>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:D9:08:35:47LNM 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.
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.
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]? 1LNM Agents Enabled: RPS CRS REM
[M] means the command is available at the LNM> prompt. Display this prompt as follows:Config>protocol bridge
Transparent Bridge user configuration
Bridge Config>lnm
LNM configuration
LNM config>
Table 1 lists the LNM commands. Not all parameters apply to all router platforms. Press Space after you type a command to display the available parameters for each command for your router. Enter help for information about using the command line interface.+protocol bridge
Bridge>lnm
LNM>
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
disable CRS
Port Number [1]? 3
disable REM
Port Number [1]? 3
Already Disabled
disable RPS
Port Number [1]? 3
disable lnm
Port Number [1]? 1
LNM not configured for Port 1
disable configuration-remote-change
CONFIGURATION-REMOTE-CHANGE: Disabled
enable CRS
Port Number [1]? 10
Port number 10 does not exist
enable REM
Port Number [1]? 3
Already Enabled
enable RPS
Port Number [1]? 1
Port number 1 is not Token Ring
enable lnm
Port Number [1]? 1
enable configuration-remote-change
CONFIGURATION-REMOTE-CHANGE: Enabled
exit
list password
Reporting Link Password
0 87654321
1 MADRAS
2 ABC1234
3 123ABC
CONFIGURATION-REMOTE-CHANGE: Disabled
list port
Port Number [1]? 1
LNM Agents Enabled: RPS CRS REM
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
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
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 password
Link Number [0]? 1
Enter new password : [ABCDEFGH]? guesswho