Ping problem to a vlan1 address..

[hyukin.kwon]

Hi all,

I have a few switches which are cat6509,cat4006,cat3524. They are connected with each other through 802.1Q trunking. Main backbone is Cat6509. All devices have vlan 1 ip address for management.

Problem is ,sometimes, I can't ping the vlan 1 ip addresses of cat 4000 and cat 3524 from cat6509 but those devices are normaly operating and users on those devices can connect anywhere.

Is this the for traffic priority ? or devices' weird behavior ?

Thanks in advance..

Welcome any possibilities

[Josef Oduwo]

Is it always that you cannot ping these management addresses or just sometimes? Look at your access lists (deny ICMP)...

Josef.

[hyukin.kwon]

Hi,Josef..

It happens from time to time..

Of couruse, there is not ACL about ICMP.

Is that possible that when there is burst traffic ?

thanks in advance..

[glen.grant]

If the supervisor gets really busy then it may not respond to a PING. If it's getting that busy though you need to find out what is driving that utilization . Can you telnet to the switch when it doesn't ping ?

[hyukin.kwon]

Hi glen..

I couldn't ping and telnet in that situation. So I couldn't see the utilization of that devices.

Is the problem is result of High CPU utilization ?

In that situation , Traffic is forwarding normaly except pinging to the vlan 1 address.

Thanks in advance...

[glen.grant]

Sounds like it to me .

[glen.grant]

don't know how new your code is but you could use the command "show proc cpu history" and this will feed you a graph of the last few minutes and up to the last 72 hours for cpu utilization . Not sure if it is supported on the newer catos code, almost think it is .

[hyukin.kwon]

Thanks glen..

I will try..

It's helpful..