STP is used to avoid switching or bridging loops in the network. If STP is disabled on any one of the switch Loops will occur. In this post, i will be discussing how to detect switching loop in the network.
1) Check For broadcast frames on the interface, whether they are increasing or not with the help of following command.
Switch # show interface counters
If broadcast packets are increasing at very fast rate, then there may be loop on the switch network..
2) Check for CPU utilization on the interface , whether the CPU utilization is high or low....
Switch # show processes cpu sorted
The above command is used to check which processes on the switch are consuming more cpu utilization
or
switch# show processes cpu history
The above command is used to provide to full information about cpu utilization on the switch.
3) Check Port Utilization
Switch # show interfaces fastethernet 0/0
4 ) Check for MAC address flapping on the switch, if one MAC address associated with more than one port then there may be the chance of switching loops..
1) Check For broadcast frames on the interface, whether they are increasing or not with the help of following command.
Switch # show interface counters
If broadcast packets are increasing at very fast rate, then there may be loop on the switch network..
2) Check for CPU utilization on the interface , whether the CPU utilization is high or low....
Switch # show processes cpu sorted
The above command is used to check which processes on the switch are consuming more cpu utilization
or
switch# show processes cpu history
The above command is used to provide to full information about cpu utilization on the switch.
3) Check Port Utilization
Switch # show interfaces fastethernet 0/0
4 ) Check for MAC address flapping on the switch, if one MAC address associated with more than one port then there may be the chance of switching loops..
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