From: Daniel Cisco Group Study (danielcgs@imc.net.au)
Date: Tue Apr 08 2003 - 05:25:44 GMT-3
I've managed to use generic traffic shaping quite successfully for this scenario. You configure the GTS on the outgoing interface of your router.
For example:
256k Serial to Internet - Heaps of incoming HTTP from internet web sites, no room for other "critical" apps..
Apply GTS on ethernet interface, limiting the HTTP to 192k:
int e0
traffic-shape group 177 192000 24000 8000 1000
access-list 177 permit tcp any eq 80 any
This gives us 64k clear bandwidth for non http traffic....
Shaping seems to works well because the packets are delayed, slowing down the outbound acks....which in turn slows down the incoming HTTP...
Hope this helps.
Daniel
-----Original Message-----
From: Anthony Pace [mailto:anthonypace@fastmail.fm]
Sent: Tuesday, 8 April 2003 11:01 AM
To: ccielab@groupstudy.com
Subject: QOS, traffic policing and shaping (real-world)
I have a sort of generic real world question about traffic engineering.
How can you control the bursty traffic on a connection to the Internet
(or anywhere) when the EGRESS traffic is relatively light compared to the
massive amount of traffic coming back. In this scenario we don't control
the upstream (PROVIDER) router.
- "Police it coming in" won't help as it has already done it's damage by
consuming the link
- "Shape it going out" won't help because the "requests" are not
bandwidth intensive, and queuing never really kicks in; unless the
outbound traffic begins to fill the queue (which it doesn't).
I have used traffic-policing in the past to control a customers INGRESS
traffic, as it leaves their spoke destined for the HUB, stopping them
from getting more bandwidth than they paid for. I have also worked
through the countless traffic shaping and QOS labs for CCIE, and read all
the examples on this in books, where we are asked to divide the bandwidth
up by managing who gets dropped out of the queue as their packets are
waiting to be put on the wire.
Does this question make sense? I don't see the Asymmetrical nature of
Internet or Client/Server traffic addressed in any of the books I have or
on CCO. It is seems like everyone is always more obsessed with the "exact
byte count in the queues".
Anthony Pace CCIE 10349
-- Anthony Pace anthonypace@fastmail.fm-- http://www.fastmail.fm - The way an email service should be
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