Have a customer that has two different sites with a couple S8's at the core of one and S4's at the core of another.
The edge consists of multiple stacks of C5's which the top switch being a C5K for 10gb.
There seems to be a couple, out of the manystacks that persistently give the following error:
SNMP Contact Lost: No SNMP reply from device 192.168.xxx.xx caused by SNMP Error: Timeout, last uptime was 21 Days 23:14:26.4
When Netsight looses SNMP contact to the switch you can still ping and SSH to it, and no other adverse affect seems to be happening to the switch then what seems random lose in polling.
When an event briefly happened I was able to get onto the device and tried to ping the IP address of the Netsight server, which failed! I wasn't able to do anymore testing before it came back online.
The uplink ports consist of one 1 x 10gb and 2 x 1GB as a lag. MSTP is configured with the data vlan using the 10Gb and the lag used for the voice vlan.
Have looked at spanning, and there has been no topology changes, the ports have remained continually up and show no errors in rmon stats.
Not sure if anyone has seen this before and can provide any suggestions?