LCC1的SIB4板卡处于check状态：
test> show chassis sibs
scc-re0:
--------------------------------------------------------------------------
Slot State Uptime
0 Spare
1 Online 28 days, 20 hours, 31 minutes, 11 seconds
2 Online 28 days, 20 hours, 31 minutes, 8 seconds
3 Online 28 days, 20 hours, 31 minutes, 5 seconds
4 Online 28 days, 20 hours, 31 minutes, 2 seconds
lcc0-re0:
--------------------------------------------------------------------------
Slot State Uptime
0 Spare
1 Online 28 days, 20 hours, 29 minutes, 3 seconds
2 Online 28 days, 20 hours, 29 minutes, 2 seconds
3 Online 28 days, 20 hours, 29 minutes, 2 seconds
4 Online 28 days, 20 hours, 29 minutes, 1 second
lcc1-re0:
--------------------------------------------------------------------------
Slot State Uptime
0 Spare
1 Online 28 days, 20 hours, 29 minutes, 26 seconds
2 Online 28 days, 20 hours, 29 minutes, 25 seconds
3 Online 28 days, 20 hours, 29 minutes, 24 seconds
4 Check 28 days, 20 hours, 29 minutes, 24 seconds
将SIB 4的cable和接口做了清洗，但故障未解除，同时将LCC0和LCC1的SIB做了互换，LCC1的SIB 4还维持在check状态上，因此可以判定LCC的SIB没有问题，故障点可能是在SIB 4的cable或SCC的SIB4板上。
如果要进一步定位故障，需要OFFLINE目前在用的一个SIB平面，并且要做几次切换和板卡插拔的操作。
通过更换cable及互换SCC 上的SIB3和SIB4模块，定位到确实是SCC上SIB4模块的故障导致
