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Chapter 31
Monitoring the SSB
You monitor the M20 router System and Switch Board (SSB) to ensure that it
provides allocation of incoming data packets throughout shared memory on the
Flexible PIC Concentrators (FPCs), transfers outgoing data cells to the FPCs for
packet reassembly, performs route lookups using the forwarding table, monitors
system components for failure and alarm conditions, and monitors FPC operation
and reset. (See Table 94.)
Table 94: Checklist for Monitoring the SSB
Monitor SSB Tasks Command or Action
Understanding the SSB on page 406
Monitoring the SSB Status on page 408
1. Display the SSB Environmental Status on page 408 show chassis environment
2. Display the SSB Detailed Status on page 409 show chassis ssb
3. Check the SSB LEDs on page 409 Check the LEDs on the SCB faceplate.
Checking for SSB Alarms on page 410
1. Display SSB Error Messages in the System Log File on
page 410
show log messages
2. Display SSB Error Messages in the Chassis Daemon Log File
on page 411
show log chassisd | match ssb
Verifying SSB Failure on page 411
1. Check the SSB Connection on page 411 Check the thumbscrews on the left and right sides of the SSB.
2. Perform a Swap Test on the SSB on page 412 1. Take the SSB offline.
2. Remove the SSB.
3. Replace the SSB with one that you know works.
Getting SSB Hardware Information on page 413
1. Display the SSB Hardware Information on page 413 show chassis hardware
2. Locate the SSB Serial Number ID Label on page 413 Look for the SSB serial number label located on the top of the
SSB adjacent to the SDRAM memory bank.
3. Display the SSB Firmware Version on page 414
show chassis firmware
Replacing the SSB on page 414
See “Return the Failed Component” on page 86, or follow the
procedure in the M20 Internet Router Hardware Guide.
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