From: Mike Schlenger (mschlenger@meridianitsolutions.com)
Date: Wed Mar 05 2003 - 18:07:42 GMT-3
In my opinion to this question, there is no right or wrong answer
essentially. In a debate of this matter, there are many variables that can
and will effect saturation and performance. I would want to consider, off
the top of my head, Router CPU, Interface MTU, Average packet size (are they
all 1500 bytes?), corresponding serialization delay, queue size, etc. Its
really an open ended question...If you had more specifics, I think you could
then determine whether or not your router is actually dropping packets, or
if you're saturating the pipe.
Mike
Michael Schlenger
CCIE #7079
Meridian IT Solutions
mschlenger@meridianitsolutions.com
847.592.3912
-----Original Message-----
From: Pratt, Jeremy [mailto:JPratt@coh.org]
Sent: Wednesday, March 05, 2003 11:25 AM
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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