Troubleshooting
Unusual Network Activity
â– Ensure that the radius-server timeout period is long enough for network
conditions.
â– Verify that the switch is using the same UDP port number as the server.
RADIUS server fails to respond to a request for service, even though
the server’s IP address is correctly configured in the switch. Use
show radius to verify that the encryption key the switch is using is correct for
the server being contacted. If the switch has only a global key configured, then
it either must match the server key or you must configure a server-specific
key. If the switch already has a server-specific key assigned to the server’s IP
address, then it overrides the global key and must match the server key.
Global RADIUS Encryption Key
Unique RADIUS Encryption Key
for the RADIUS server at
10.33.18.119
Figure C-7. Examples of Global and Unique Encryption Keys
Spanning-Tree Protocol (MSTP) and Fast-Uplink
Problems
Caution If you enable MSTP, it is recommended that you leave the remainder of the
MSTP parameter settings at their default values until you have had an oppor-
tunity to evaluate MSTP performance in your network. Because incorrect
MSTP settings can adversely affect network performance, you should avoid
making changes without having a strong understanding of how MSTP oper-
ates. To learn the details of MSTP operation, refer to the IEEE 802.1s standard.
C-18
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