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Cisco 2960 Management SVI cannot ping directly connected devices in different VLAN

Posted on 2013-06-03
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Last Modified: 2013-06-09
After years of working, a Cisco 2960 with 2 Production VLANS stopped communicating on ONLY one of those two Production VLANS. The 2960 does have a management SVI and its gateway points to a SVI on a direclty connected 3750. Both SVI's can ping each other.

Both 2960 & 3750 are connected via a fiber trunk port - encapsulation is DOT1Q.

The working VLAN's Gateway is a SVI on the 3750 whereas the non-working VLAN's Gateway/SVI is on another 3750. Both 3750's are connected with fiber trunk ports and all 3 switches can ping each other.

Myself and my tech have both verified the routing and all looks good. I even set it up in Packet tracer and it works there.

What is a real mystery is that if I telnet into the 2960 i cannot ping any devices directly connected to it. They are in different subnets but I have other 2960s setup in other areas configured the same way and they can ping their directly attached devices without a problem.

Did I get hit with a solar flare or gremlin attack?

Sincerely,

Perplexed
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Question by:mcit0331
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by:unfragmented
ID: 39217895
Whenever 2 devices are on separate vlans, they will only talk via a layer 3 device (L3 switch or router).  This includes management interfaces on 2960.

Since your problem seems to be at the 2960, start your troubleshooting there.  Can you ping the default gateway from the 2960 and post the results.
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mcit0331 earned 0 total points
ID: 39219468
Dear Unfragmented,

A 3750 is a layer 3 device/switch and I stated in the first paragraph that both SVI's can PING each other.

The issue was "tcammgr-3-handle_error" on the 3750 which a reboot cleared.

Thanks anyway.
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by:unfragmented
ID: 39220802
ooh nasty.  If you have TAC support, I'd run that past them, particularly if it happens again.  Sounds like a possible software bug.  Good to hear you resolved it!
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Author Closing Comment

by:mcit0331
ID: 39232730
I solved the problem with a reboot.
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