[cisco-nas] Input queues drops on IOS 12.3(10)

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Thu Mar 3 02:03:14 EST 2005

> I'm running Cisco IOS 12.3(10) (c5300-is-mz.123-10.bin) on AS5300's
> and am experiencing input queue drops on my FE interfaces: 
>  Input queue: 513/512/162151/65 (size/max/drops/flushes); Total
> output drops: 0 
> Increasing the hold-queue to 2096 get the packets flowing again:
>  Input queue: 545/2096/162496/65 (size/max/drops/flushes); Total
> output drops: 0 

> The only traffic that I'm seeing destined to my FE is SGBP traffic
> to/from my other NASs.  I've got ~22 NASs running SGBP in this
> particular POP - I am not sure that this is causing the problem
> though - I've seen my input queues fill up in smaller POPs, which
> only got two SGBP members.    
> Any hints/ideas on what to look for in my cache flow data?  Should I
> increase the hold-queue to 1024 for input packets on fa0? 

Can you check "show ip traffic" if you're doing a lot of re-assembly?
I.e. when the AS5300 is used as L2TP LAC and it needs to re-assemble
fragmented L2TP-pkts? Pkt reassembly can only be done in the process
path.. This can also happen with SGBP-initiated tunnels for
Multichassis-MLPPP sessions.
> I've had similar issues on IOS 12.2.(19) as well.  What is the
> current recommended code for AS5300 and AS5400's? 

12.3(10b) (or 12.3(10c) which will be on CCO shortly) and 12.3(12a) are
proven releases in this environment..


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