From: Colin Barber (Colin.Barber@telewest.co.uk)
Date: Mon Apr 14 2003 - 11:52:46 GMT-3
When the traffic arrives the frames are marked with DE if the rate exceeds
the configured CIR,BC and BE. Depending on the settings the telco is using
DE frames could be forwarded or dropped. If your Telco drops all DE packets
then you certainly would not want to mark frames yourself.
Colin
-----Original Message-----
From: Charles Church [mailto:cchurch@wamnet.com]
Sent: 14 April 2003 13:35
To: jfaure@sztele.com; ccielab@groupstudy.com
Subject: RE: FRTS & DE
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
----------------------------------------------------------------------------
SOLUZIONA TELECOMUNICACIONES
Servicios Profesionales de UNION FENOSA
Jerez, 3
28016 MADRID
tel 91 579 30 00 fax 91 350 72 83
---------------------------------------------------------------------------
------------------------------------------------------------------------------
Live Life in Broadband
www.telewest.co.uk
The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material.
Statements and opinions expressed in this e-mail may not represent those of the company. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender immediately and delete the material from any computer.
==============================================================================
This archive was generated by hypermail 2.1.4 : Thu May 01 2003 - 13:35:52 GMT-3