You are correct, in that you don't generally *need* to configure CIR etc on
your end point routers.
However, it can be useful to configure these parameters as part of frame
relay traffic shaping.
Consider a hub and spoke setup, where the hub has a 1 Mbps access and
several spokes have 256 Kbps accesses.
Imagine a short burst of traffic from the hub to one spoke, while the other
PVCs have little or no traffic.
If the hub router has no knowledge of the CIR, Be etc, then it will attempt
to send this burst of traffic at 1 Mbps. The traffic will hit your ingress
switch (the first frame relay switch), which will promptly drop all traffic
above 256 Kbps as it is aware that the remote spoke can't accept it.
If, on the other hand, you configure traffic shaping, and set the maximum
rate for the PVC to 256 Kbps, the excess traffic will be buffered at the
hub router rather than dropped.
Whether this is what you want may depend on your traffic, but I'm a big fan
of frame relay traffic shaping personally - it improved service on our WAN
quite noticeably.
JMcL
----- Forwarded by Jenny Mcleod/NSO/CSDA on 04/10/2001 09:12 am -----
"Umer
Irshad
Khan" To:
[EMAIL PROTECTED]
Subject: frame relay qos on the
router
Sent by:
[7:21885]
nobody@groups
tudy.com
04/10/2001
03:46
am
Please
respond
to
"Umer
Irshad
Khan"
hi,
I have a question. consider a network consisting of frame realy switches
(newbridge nodes containg framerelayengine cards) connecting two routers
via
serial interfaces. if we have the qos parameters like the CIR,Bc and Be
defined on the frame realy switches for a particular virtual connection. is
there a need to define the same parameters on the serial interfaces of the
two
end point routers also. what is the use of that since the rate enforcement
would be carried out effictively by the switches inside the framerealy
cloud.
right ? we can simply define a BW on the router interfaces which is more
than
Bc + Be.
umer irshad khan
[EMAIL PROTECTED]
WOrld is wHat you maKe of iT
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=21953&t=21885
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
