Monitoring the SIB Status ! 329
Chapter 24: Monitoring the SIBs
M320 Router SIBs
Four SIBs are installed in the M320 router. The SIBs are located at the center rear of
the chassis in the slots labeled
SIB0 through SIB3 (top to bottom). See Figure 136 on
page 328. All four SIBs are active, and there is no backup.
T320 Router SIBs
Three SIBs are installed in the router. The SIBs are located at the center rear of the
chassis in the slots labeled
SIB0 through SIB2 (see Figure 136 on page 328).
Each FPC has a dedicated ASIC with five high-speed links that connect to the SIBs.
Two high-speed links connect to SIB1 and SIB2. One high-speed link connects to
SIB0. SIB0 acts as a backup to SIB1 and SIB2. In the event of a complete SIB failure,
SIB0 will become active. Because SIB0 has only one high-speed link to each FPC,
only three links will remain active. A slight degradation in forwarding capacity may
occur. When the failed SIB is replaced, it will become active and
SIB0 will revert to
backup. The router will regain full forwarding capacity.
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 136 on
page 328.
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.
Monitoring the SIB Status
Steps To Take To monitor the SIB status, follow these steps:
1. Display the SIB Summary Status on page 330
2. Display the SIB LED Status at the Command Line on page 330
3. Check the SIB LED Status on the Faceplate on page 330
4. Display the SIB Environmental Status on page 331
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