?– Most of the troubleshooting steps simply use show commands to identify error
conditions. Knowledge of the network helps you focus on the critical ports on the key
devices.
Identify a Bridging Loop
It used to be that a broadcast storm could have a disastrous effect on the network. Today,
with high-speed links and devices that provide switching at the hardware level, it is not
likely that a single host, such as a server, will bring down a network through broadcasts.
The best way to identify a bridging loop is to capture the traf?¬?c on a saturated link and
verify that you see similar packets multiple times. Realistically, however, if all users in a
certain bridge domain have connectivity issues at the same time, you can already suspect a
bridging loop. Check the port utilization on your devices to determine whether abnormal
values are present.
Restore Connectivity Quickly
Bridging loops have extremely severe consequences on a switched network. Administrators
generally do not have time to look for the cause of the loop, and they prefer to restore
connectivity as soon as possible. The easy way out in this case is to manually disable every
port that provides redundancy in the network.
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