Understanding the SSB ! 407
Chapter 31: Monitoring the SSB
Figure 164: SSB Component
You can install two SSBs in the M20 router. The SSBs occupy the two top slots of the
card cage (
SSB0 and SSB1), and are installed into the midplane from the front of
the chassis. (See Figure 165.)
Figure 165: M20 Router SSB Location
The SSB houses the Internet Processor ASIC and two Distributed Buffer Manager
ASICs.
The SSB is hot-pluggable. You can remove and replace it without powering down the
system; however, this causes major impact to the system. While the SSB is out of
the router, route lookups, system component monitoring, exception and control
packet transfer, and FPC resets cannot occur.
When the SSB is removed, all packet forwarding stops immediately and the Routing
Engine responds by generating alarms. When the SSB is replaced, it is rebooted by
flash EEPROM.
1151
1785
SSB0
SSB1
M20 Router
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