I recevied a report of a very brief outage on 3 seperate servers. I have about 10 switches and checked each one, the uptimes were all proper. CNA did not show any outstanding errors yet it cannot monitor my 4507 core switches.
I ran a sh diagnostics all of my ports are fine, there arent any errors on the interfaces.
the servers themselves show traffic during the outage times.
This one will probably difficult to troubleshoot if not impossible.
Are all of your servers in the same VLAN? If so why did only three servers experience an outage? What I am trying to get at is that you will need to narrow it down to some commonality between these tree servers.
Are they the only servers in this VLAN? If yes it could be STP. Are they the only servers on this switch? Could be STP.
If these servers share switches and VLANs with other servers it might not be network related.
Check the logs on the servers to see if the NICs lost link.
Do you have a syslog server?
Kiwi has a free version you can then syslog at the debug level to the machie running Kiwi. Then the next time this problem arises you will have syslog entries.
With everything in one VLAN it pretty much rules out STP.
Output buffer errors and memory leaks are both cause for concern. You could recover from memory leaks by rebooting - but that would only be a temporary solution as they will come back. Best bet is to update the IOS and then reboot.
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