Switch communication problem

[andre.sato]

We have 2 servers A and B in the same VLAN 255 and switch. (A) can ping any equipment in VLAN 255 but (B). (B) can ping any equipment in VLAN 255 but (A). We checked the TCP/IP masks, cables, network cards and switch ports. We also changed one of the cards and chose other ports to connect the servers but didn't solve the problem. The MAC(A) and MAC(B) were in the switch ARP table. We put another equipment (C)

in VLAN 255 and different port. The situation changed, (A) and (B) started to ping all equipments in 255 but (C) could ping only some servers in 255. Clearing ARP table resulted in nothing. We solved the problem rebooting the switch. We didn't find a root cause for this issue. Did somebody have this problem once and know why it occurs?

Thanks.

[Georg Pauwen]

Hello,

could be a bug...which platform (e.g. 3548, 2950) and which IOS (or CatOS) version are you running on your switch ?

I had a similar issue once, but that was related to the VLAN not being properly trunked. Is the VLAN 255 local, or is your switch a VTP client switch that gets its VLAN information from a VTP server ?

Regards,

GP

[andre.sato]

We have a Cisco WS-C3524-XL running c3500XL-c3h2s-mz-120.5-XU.bin

The switch is VTP client. During the troubleshooting we checked if the VLANs were in the table. They are.

Regards,

[amit-singh]

Hi,

As guessed by GP it could be a bug and seems to be a transient issue nothing more than that. I have faced a lot of issue in which rebooting the switch resolves a lot of issue.

You IOS seems to be a lil old. Try upgrading the IOS to the latest one and it will take care of many unknown issues for the future.

regards,

-amit singh