Step 2: Display SSB Error Messages in the System Log File

Periodically check the system log messages on the management console for messages sent by the SSB. During normal operation, the SSB notifies the Routing Engine of any errors it detects.

Action

To display the SSB error messages in the system log file, use the following CLI command:

user@host> show log messages

Sample Output

user@host> show log messages

Jul 10 13:28:45 myrouter /kernel: fxp1: media DOWN 100Mb / full-duplex

Jul 10 13:28:45 myrouter /kernel: fxp1: media DOWN 10Mb / half-duplex

Jul 10 13:28:45 myrouter /kernel: fxp1: media DOWN 100Mb / full-duplex

Jul 10 13:28:45 myrouter /kernel: fxp1: link UP 100Mb / full-duplex

Jul 10 13:28:45 myrouter rpd[564]: EVENT <UpDown> fxp1.0 index 1 <Up Broadcast 
Multicast> address #0 0.a0.a5.12.1d.6d

Jul 10 13:28:45 myrouter mib2d[563]: SNMP_TRAP_LINK_UP: ifIndex 2, ifAdminStatus 
up(1), ifOperStatus up(1), ifName fxp1

[...Output truncated...]

What It Means

The messages system log file records the time the failure or event occurred, the severity level, a code, and a message description. You can also use the show log messages | match ssb command to see error messages that are generated when an SSB fails or is offline. Use this information to diagnose a problem and to let the Juniper Networks Technical Assistance Center (JTAC) know what error messages were generated and the router events that occurred before and after the problem. For more information about system log messages, see the JUNOS System Log Messages Reference.