[c-nsp] Unexplainable Output drops on serial interfaces

[Everton da Silva Marques]

On Thu, Feb 19, 2009 at 02:59:52PM -0500, Todd Shipway wrote:
> 
> We have multiple T1 interfaces across different cards and different type
> of cards in a 7513.  Many interfaces are showing output drops and I
> can't pinpoint why.  The interfaces are spread throughout the system and
> I can't pinpoint a single point that could be causing the drops.  Below
> is 2 interfaces showing the drops.
> 
> The bandwidth is very low when the drops are occurring, these 2
> interfaces are part of a multilink interface which shows no drops.  Any
> ideas as to what I should look for that could be causing this?

Check Rx-Side Buffering:

http://www.cisco.com/en/US/products/hw/modules/ps3088/products_tech_note09186a0080094345.shtml
http://www.cisco.com/warp/public/63/vip_cpu_rxbuffering.html

Everton