From: Charles Church (cchurch@wamnet.com)
Date: Thu Mar 06 2003 - 10:38:43 GMT-3
Sam,
I don't think that pps rating will be much of a bottleneck. 75,000 pps at
64 bytes each is about 38 mbit. T1s won't ever be a problem, unless it
starts process switching them. CEF might actually improve that pps rating
as well. Given average sized packets of 500 or more bytes, you'll find the
3640 can handle a ton. DDOS's excluded!
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Pratt, Jeremy
Sent: Wednesday, March 05, 2003 12:25 PM
To: 'Sam Munzani'; ccielab@groupstudy.com
Subject: RE: At what percentage of T1 utilization you should see
performan ce degrade?
The 3640 can handle more than 1 full T1. You'll probably have to adjust
the
queue outbound and inbound queue sizes. I've got a 3640 with 4 T1's on
it
and no one ever has performance problems and all 4 T1's run very hot,
75%
and up during peak traffic.
-----Original Message-----
From: Sam Munzani [mailto:sam@munzani.com]
Sent: Wednesday, March 05, 2003 7:51 AM
To: ccielab@groupstudy.com
Subject: At what percentage of T1 utilization you should see performance
degrade?
Hi,
Today we got in to a debate about T1 saturation and performance
degradation.
Below is 2 different opinions from my self and other engineer.
What I say.
T1 is a full duplex mechanism. So until it hits 100% utilization on it's
Serial(Full T1) interface it will forward to packet and no packet drop
will
happen. Only the time it will do a queue drop is when the traffic bursts
above
100%. This queue drop is because of Serial interface short on forwarding
buffers. Same behavior will happen on inbound. Only the time this would
be a
bottleneck is if router CPU is a bottleneck. This is on 3640 with Fast
switching turned on. I am assuming 3640 can handle more than 1 T1
bandwidth.
The other engineer's opinion.
3640 supports only 75000 pps with 64 bytes packets. His opinion is, your
users
will see performance problems even before T1 is hitting 100%(aroung 70
to
80%).
Any opinions with enough supporting proofs are most welcome.
Regards,
Sam Munzani
CCIE # 6479(R&S, Security)
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