[c-nsp] IOS ping response improvement

Church, Chuck cchurch at netcogov.com
Tue Feb 14 16:54:34 EST 2006

I'll suggest it to management, although these devices only exist at the
access layer, so there's no guarantee a workstation will be up 24/7 to
ping continuously.  The rtr responder isn't available (they only run
12.0 code).   


Chuck Church
Network Engineer
Netco Government Services -  Enterprise Network Engineering
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 864-266-3978
cchurch at netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
"I'm one Snickers Pie away from losing my foot to diabetes."  -  Homer

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Justin M.
Sent: Tuesday, February 14, 2006 3:09 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] IOS ping response improvement

On Mon, 13 Feb 2006, Pete Templin wrote:

> Church, Chuck wrote:
>>     I'm facing an issue with missed SLAs regarding 2900XL switches
>> slow ping response
> I ran into the same issue - 7507s give crappy ping response once per
> minute, but if you ping something on the other side of them they're
> fine.  Solution: put something on the other side of them.

Much of this has to do with the fact that traffic directed _to_ the
often needs to be process switched - the device has to do more work to 
respond, so the fact those ping attempts show higher numbers really
indicative of much more than that.  I don't think the 2900XLs support
switching path other than process switching because they're not designed

to handle layer 3 traffic in any significant volume.

As another poster mentioned, try basing your ping measurements off of 
devices sitting behind the router and the switch and I think you'll see
significant difference in your RTT measurements.

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