From: Kenneth Wygand (KWygand@customonline.com)
Date: Wed Apr 21 2004 - 09:41:42 GMT-3
Richard,
If the other side (ISP) is policing you, that's your best strategy...
configuring any value for Be will allow you to burst over the 4 Mbps for
at least a single Tc, but if your ISP is strictly policing you down to 4
Mbps, that excess traffic will be dropped.
Of course, we all know that the SLA promised by ISP's is rarely
reflected with technical implementation...
To test, why don't you perform a few large download TCP streams from a
local high-speed web site and monitor the consistent download rate you
are permitted. If your TCP slow-start averages off to 500KByte/sec (4
MBps), I'd configure traffic shaping the way you mentioned.
HTH,
Kenneth E. Wygand
Systems Engineer, Project Services
CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
Network+, A+
Custom Computer Specialists, Inc.
"The only unattainable goal is the one not attempted."
-Anonymous
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Richard Dumoulin
Sent: Wednesday, April 21, 2004 8:10 AM
To: ccielab@groupstudy.com
Subject: Shaping a policed link
Hello group,
Suppose an Internet router is connected to an ISP via a 10 Meg
ethernet
link. But the ISP port is rate limited at 4 Mbps. I would like to
configure
shaping on the router port so that the ISP does not drop any packet.
Should I configure the shaping target rate at 4 Mbps with no excess
bursting
capability ? Or is there a better strategy ?
Thank you
Richard Dumoulin
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