[c-nsp] Best practice - Core vs Access Router

David Freedman david.freedman at uk.clara.net
Wed Feb 10 14:25:31 EST 2010

Hash: SHA1

David Prall wrote:
> Your drops and flushes counts are the same.

All his drops are flushes, you usually see this when the system and SPD
can't deal I believe, would be interested if the system buffers for the
control plane are getting misses or creation churn (sh buff)


 A flush is a control plane
> packet that pushed to CPU even though the input queue was filled. I don't
> believe these two numbers should be the same unless all of the input queue
> was filled with these packets.
> David
> --
> http://dcp.dcptech.com
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
>> bounces at puck.nether.net] On Behalf Of Andy B.
>> Sent: Wednesday, February 10, 2010 2:01 PM
>> To: David Freedman
>> Cc: nsp-cisco
>> Subject: Re: [c-nsp] Best practice - Core vs Access Router
>> On Wed, Feb 10, 2010 at 7:48 PM, David Freedman
>> <david.freedman at uk.clara.net> wrote:
>>> So, are you checking your interfaces for incrementing drop/error
>> counters?
>>> Are you seeing any of this when there is the problem occuring?
>>> (clear counters , sh int summ etc..)
>> I am having input drops all the time, no matter how high or low I set
>> the incoming hold-queue.
>> The OSPF and IBGP interfaces approx. 30 minutes after I cleared the
>> counters:
>> TenGigabitEthernet8/1 is up, line protocol is up (connected)
>>   Input queue: 0/2000/622/622 (size/max/drops/flushes); Total output
>> drops: 0
>> TenGigabitEthernet9/1 is up, line protocol is up (connected)
>>   Input queue: 0/4096/1664/1664 (size/max/drops/flushes); Total output
>> drops: 0
>> TenGigabitEthernet9/2 is up, line protocol is up (connected)
>>   Input queue: 0/4096/1916/1916 (size/max/drops/flushes); Total output
>> drops: 0
>> These links are not congested! Te9/1 is the busiest with maybe 6.5 out
>> of 10 Gig. The other two are below 5 Gig.
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