[c-nsp] troubleshooting SVI input drops on MSFC3

[Dale W. Carder]

Here's some commands to get you started:

sh buffers input-interface
sh int vlan1234 switching
sh ip interface
sh ip traffic
sh cef drop
sh ip cache flow
sh cef not-cef-switched

Some more help can be found here:
http://www.cisco.com/warp/public/63/queue_drops.html

You also might want to verify that you didn't configure a feature
that causes punts.

If you really want to get dirty, you can create a span session to
monitor traffic destined to the RP.  This has been discussed on this
list once or twice, but it is a bit messy.

Dale


On May 9, 2007, at 9:43 AM, barney gumbo wrote:

> I am seeing high input interface drops on an SVI interface on an  
> MSFC3.  The
> MSFC3 is installed in a 6503 chassis with Sup720.  The switch is  
> running
> hybird mode.
>
> The traffic load has increased, and CPU is running high when the  
> traffic
> load increases.  I don't know why the SVI is showing increased  
> traffic load
> because normally I don't see traffic through the SVI, it all get's MLS
> switched.  Something in the last week has caused traffic to be  
> switched
> through the SVI showing the high input drops.  The overal load of  
> traffic
> which should be routed (MLS switched) via the interface has not  
> increased or
> decreased; all of a sudden in the last week traffic is being  
> (seemingly)
> process switched through this SVI.
>
> Where do I begin troubleshooting high interface drops on an SVI?