[c-nsp] Ouput Drops - 6500...

[Church, Chuck]

Are the drops on a physical interface, or a VLAN int?  If you're trying
to put all 700mbit/sec (which is an average) out on one physical
interface, there a good chance there are frequent bursts above 700mbit,
maybe even approaching the 1gig limit.  Those gig ports only have a
small (~1 mbyte or so) buffer, so they don't queue stuff for too long.
Those bursts are probably the cause.  If you can easily bump up one of
the links to a 2-port etherchannel, that might fix it there.


Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team
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 


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Brian W.
Gemberling
Sent: Wednesday, November 02, 2005 3:08 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Ouput Drops - 6500...


Hello,

 	We are currently getting output queue drops on one of our 6500's

w/ SUP2 MSFC2.  We are running Native IOS and the card is a 6416-GBIC.
We 
turned off routing and went directly to switching only, however, we
still 
got output queue drops.  I think I already know the answer to this, but 
I'll ask anyways.  If we converted back to CatOS and ran strictly L2
only, 
would we still have the same issues?  Traffic levels are about 700mbit/s

in on one gig-e port on the 6416, and was in turn going out the SUP2
gig-e 
ports where it was getting output drops.  Any insight would be 
appreciated.

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