Unfortunately, when a bridging loop occurs, you seldom maintain
connectivity to a syslog server.
Temporarily Disable Unnecessary Features
Disable as many features as possible to help simplify the network structure and ease the
identi?¬?cation of the problem. For example, EtherChannel is a feature that requires STP to
logically bundle several different links into a single link, so disabling this feature during
troubleshooting makes sense. As a rule, make the con?¬?guration as simple as possible to ease
troubleshooting.
Designate the Root Bridge
Often, information about the location of the spanning-tree root bridge is not available at
troubleshooting time. Do not let STP decide which switch becomes the root bridge. For
each VLAN, you can usually identify which switch can best serve as the root bridge. Which
switch would make the best root bridge depends on the design of the network. Generally,
choose a powerful switch in the middle of the network. If you put the root bridge in the
center of the network with direct connection to the servers and routers, you generally reduce
the average distance from the clients to the servers and routers. For each VLAN, hard code
which switches will serve as the root bridge and which will serve as the backup (secondary)
root bridge.
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