Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 376)

352 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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MPLS LDP-IGP synchronization
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• Syslog logs the event of a LDP session going down and then coming back up, as a result of
resetting the LDP session. Use the command show log to view the syslog events.
Following is an example of how to use the show log command to view the syslog.
Brocade# show log
Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns)
Buffer logging: level ACDMEINW, 33 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning
Dynamic Log Buffer (50 lines):
Sep 9 18:38:20:N:MPLS: LDP entity session 10.1.1.1:0 with peer 10.2.2.2:0 is up
Sep 9 18:38:02:N:MPLS: LDP entity session 10.1.1.1:0 with peer 10.2.2.2:0 is down
The following command shows two LDP sessions with neighbor 10.234.123.64.
Brocade# show mpls ldp session
Peer LDP ID State Adj Used My Role Max Hold Time Left
10.234.123.64 Operational Link Passive 36 33
The following command clears both the link and targeted LDP session with neighbor
10.234.123.64, because the label_space optional parameter has not been specified.
Brocade# clear mpls ldp neighbor 10.234.123.64
Brocade#
Brocade# show mpls ldp session
Peer LDP ID State My Role Max Hold Time Left
10.234.123.64 Operational Passive 36 33
Brocade#
This command shows that after waiting for roughly 20 seconds (depends on the hello/keepalive
timer periodicity), both the LDP sessions are reestablished.
Brocade# clear mpls ldp neighbor 10.234.123.64
Peer LDP ID State My Role Max Hold Time Left
10.234.123.64 Operational Passive 36 33
The user can also validate the clear mpls ldp neighbor command using the syslog command.
Brocade# show log
Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns)
Buffer logging: level ACDMEINW, 47 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning
Dynamic Log Buffer (50 lines):
Sep 9 19:23:24:N:MPLS:LDP entity session 10.2.2.2:0 with peer 10.234.123.64 is up
Sep 9 19:23:08:N:MPLS:LDP entity session 10.2.2.2:10 with peer 10.234.123.64 is down
Sep 9 19:23:08:N:MPLS:LDP entity session 10.2.2.2:0 with peer 10.234.123.64 is down
MPLS LDP-IGP synchronization
Packet loss can occur because the actions of the IGP and LDP are not synchronized.