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Transmit Discards on Cisco 2610

Posted on 2008-11-19
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Last Modified: 2012-08-13
I have several small offices with 2610 routers using WIC-DSU-T1 to an MPLS T1 (private network).  We are seeing a large (?) number of transmit discards on the serial interface.

I've been researching and have alternatively seen turn CEF off, turn CEF on, muck around with the buffer size, don't muck around with the buffer size, and the default "buy more bandwidth".

So before I go to my CIO and ask for more bandwidth, what is the optimal configuration for a 2610 serial interface connected to a T1

right now I have

interface serial 0/0
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
encap ppp
no ip mroute-cache
no fair-queue
no ip route-cache
no ip route-cache cef

Have alternately turned on and off route-cache and route-cache cef to no avail

Thanks!
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Question by:RPPreacher
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by:anantshah
ID: 22999390
Are you seeing discards at all sites or just one? If only one site there might be other issues, bad cable, bad card, telco issues etc. Has telco tested the circuit? Have you tried a different card/cable? Do you have QOS enabled as some packets might be discarded by QOS policy.
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by:RPPreacher
ID: 23013360
All sites, no QoS
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Expert Comment

by:anantshah
ID: 23016007
Have you tried measuring the bandwidth? When you do show int at these sites what are the values for txload and rxload. High bandwidth utilizaiton can cause discards.
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by:RPPreacher
ID: 23016075
I know the bandwidth utilization is high.  I am trying to figure out if I should enable ip route-cache or not... that's it...
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RPPreacher earned 0 total points
ID: 23397433
Switching to a 2811 fixed this
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