[c-nsp] Odd Network Issue (7600/Sup3BXL)

[Devon True]

[Follow-up to list]

We thought it was the module, so we moved to another WS-X6708-10GE  
module but the problem persisted. On a whim, an engineer decided to 
remove an ACL that is in use on 20+ other routers and the problem went 
away. Adding even a simple ACL caused all transit traffic to stop. 
Locally generated traffic (e.g. BGP) went through fine.

Also, adding an IPv6 ACL would stop all IPv4 traffic.

Needless to say, we have a TAC case opened.

--
Devon

> Devon True <mailto:devon at noved.org>
> Friday, 14 March, 2014 12:07 PM
> Twice in the past two weeks, a Cisco 7600 router with a Sup3BXL has 
> stopped egress traffic from a port on a WS-X6708-10GE module to one of 
> our Internet providers. All other circuits on the same WS-X6708-10GE 
> module are fine. BGP with the provider never goes down, however 
> bandwidth drops from ~500 Mbps to < 1 Mbps. During the second event, I 
> looked at the CEF table for the interface and I saw the appropriate 
> entries. I had to restore traffic levels by shutting down BGP with the 
> provider.
>
> I have a ticket opened with Cisco TAC, but has anyone seen this issue 
> before?
>
> Running 15.2(4)S2 Enterprise
>
> -- 
> Devon
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