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Tips to find root cause of problem

Tips to find root cause of problem

Kar_Del_Moral
New Contributor III
latency of some computer in one specific vlan, Not all of the computers are affected, but it is increasing... checking traffic on ports, no messages on Core. If I move the pc to a different vlan the problem is solved for that computer, but still happening on the vlan. Please help
4 REPLIES 4

Robert_Cummins
New Contributor
 I suspect your network was looped with that other switch and you were encountering a broadcast storm. This would be apparent in a tcpdump from the client; you'll see the same broadcast packet appear in the dump multiple times. Have you enabled erp on the switch? I think it's erp; erp will automatically shutdown ports when it detects a loop.

Kar_Del_Moral
New Contributor III
Yes... I check.. but nothing.. on the counters all normal, but a did a sh fdb port on all the ports in the affected vlan... and found a switch connected, as soon I disable the port the other pc's normalize... now we need to check if it is the switch or a pc connected to it generating the traffic...

Thanks

Robert_Cummins
New Contributor
Have you checked for:
- port error counters
- client side error counters
- counters in general

What does a tcpdump from a client show?
How are you measuring the latency and how much of a change are you measuring?
GTM-P2G8KFN