T640 Routing Node SIBs

Five SIBs are installed in the routing node. The SIBs are located at the center rear of the chassis in the slots labeled SIB0 through SIB4 (top to bottom). (See Figure 225.)

Each FPC1 and FPC2 has a dedicated ASIC with five high-speed links that connect to the SIBs (one link per SIB). An FPC3 has two dedicated ASICs, and each ASIC has five high-speed links that connect to the SIBs (a total of 10 links). One of the five SIBs—usually SIB4—acts as a backup to the remaining four SIBs. In the event of a SIB failure, the backup SIB becomes active and traffic forwarding continues without any degradation. When the failed SIB is replaced, it becomes the new backup.

The SIBs are hot-insertable and hot-removable.

See Also

• Monitoring the Host Subsystem
• Monitoring the SIBs