From: Charles Church (cchurch@wamnet.com)
Date: Mon Apr 14 2003 - 09:35:18 GMT-3
Juan,
I've never worked on the FR service-provider side of things, but I've heard
that it's not a good idea to mark your frames with DE. Logically it makes
sense to pick what kind of traffic you'd like to lose first, as you could
then define a big committed burst and get away with it. But apparently many
FR switches on the service provider side don't like seeing frames arrive
from the CPE already marked with DE. They may get dropped even if no
congestion occurs. Hopefully someone from the FR SP side of things will
chime in with more details.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 585-233-2706
cchurch@wamnet.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
jfaure@sztele.com
Sent: Monday, April 14, 2003 5:36 AM
To: ccielab@groupstudy.com
Subject: FRTS & DE
Hi all:
I've some doubts about the Frame Relay Traffic Shaping operation. I've read
a cisco doc named "Configuring Frame Relay Traffic Shaping" and I don't
understand very well how the router "shapes" and drops packets when it
receives BECN's events.
If you see this doc, it seems that if any becn is received, the traffic
rate is decreased by 25 percent. Then the system continues to drop with
each BECN until you reach MINCIR, where it stops. And then, once the
traffic rate has decreased, it must allow 16 time intervals of receiving no
Becn before starting to increase traffic again.
My question is: What about the packets transmitted and marked with DE bit?
When and how the router starts to set the DE bit? Do you must configure the
router with "frame-relay de-list" and "frame-relay de-group" to achieve
this DE marking? Or the router can mark with DE without explicitily
specifiying this and then these commands are only used to specify witch
type of traffic do you prefer be maked first?
Any help would be apreciated.
Regards
Juan Faure Ferrer
email: jfaure@sztele.com
Lmnea de Negocio de Telematica y CC
Ingeniero de Integracisn de Redes y Sistemas
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