From: Colin Barber (Colin.Barber@telewest.co.uk)
Date: Wed Apr 23 2003 - 18:49:48 GMT-3
I don't think the 3550 supports CAR so you would need to use policy maps.
However 3550 only support 8 policers on each port unless your traffic is
coming into a gigabit interface (you then get 128), so it will be difficult
to configure each user separately.
If you wanted to do this then you would need something like a Cat4000 Sup
III/IV. This allows 1024 per port.
What is stopping you configuring CBWFQ on the router terminating the T1
links? I don't know if there is a limit to the number of classes but you
should be able to configure a class for each user and limit each one. The
bandwidth command only comes into effect during congestion so users will be
able to get full bandwidth if no other users are active. The high number of
classes and access-lists would give the router some work to do but as the
bandwidth is only T1 there should not be too much of a problem. If the
router cannot cope you could always just limit your 4 or 5 troublesome users
and leave the others unrestricted.
Colin
-----Original Message-----
From: Michael Snyder [mailto:msnyder@revolutioncomputer.com]
Sent: 23 April 2003 18:36
To: ccielab@groupstudy.com
Subject: OT: 3550 bandwidth limiting
I got a problem that Im not sure how to solve.
Im working with a small Broadband WISP. We have two T1s coming in,
going to a /24 network. Each user of the ISP gets one public ip of the
/24. Most have private networks behind their public ip.
My problem is that any one of the host ips can tie up the full
bandwidth of our outgoing pipes. I truly understand how this is a very
common problem with ISPs. Of our 60 present users, only 4 or 5 of them
are the bandwidth hogging trouble makers at any one time.
I do have CIR limiting options at the radio modems for the client sites,
but because of design limitations I rather not use them. The reason is
that one of the services we offer is site to site vpn and ip transit
between local sites. If I enable the cir limiting at the access point
level, it applies to all radio modem users that connect to that main
radio access point; which could be 20 or 30 people.
In a nut shell, I rather not limit local traffic, just remote traffic.
I have looked at some of unix based bandwidth limiting solutions, and
believe I could get one running if I needed.
Ok, so the goal is to bandwidth limit remote traffic and to leave local
traffic at full speed.
My tool of choice is an 3550. I have one on order to replace one of
3524s were using now.
The issues I see is per host vs aggregate subnet limiting.
In other words just how granular can I get and still have a stable
configuration?
In the best of all worlds, I wish could set each host to have 768K down
and 384K up using something like car.
My second thought is to divide the /24 into 16 /28 sections for car
purposes and use 16 car statements.
Of course if I want to go with the application limiting path, I could
use cbwfq or nbar based solutions.
Im asking for advice how you would handle bandwidth limiting using an
3550 on a per user or group of users basis.
Thanks in advance,
Michael Snyder
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