From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Nov 18 2007 - 15:31:07 ART
When you enable traffic shaping on the main interface, does it automatically
shape all DLCI's to 56k?
>YES, and IE labs have another lab where this affected a dlci inadvertently
and you need to create a second map-class to apply it to the dlci you don't
want at 56k by default.
So if you're requirement is to shape one DLCI but not impact the other
DLCI's, would you need to manually configure the CIR for the other
DLCI's?
>anytime you have more than one dlci on an interface you have to worry about
the effect of "frame-relay traffic-shaping". If you are ONLY going to
perform shaping for one dlci, and using sub-interfaces you can not use
frame-relay traffic-shaping and use nested policy-map's, where the parent
policy-map has something like "shape average 512000" in the class
class-default.
If you are going to shape per dlci with physical interface frame-relay you
should make sure you don't slow down the other dlci's. so I would go as far
making a second map class just to guarantee cir is working as planned.
(with physical interface)
Int s0/0
Frame-relay traffic-shaping
Frame-relay interface dlci 501
Class DLCI_501
Frame-relay interface dlci 502
Class DLCI_502
If so what value do you set them to if you don't know their
CIR?
>1536kbps! Better safe then sorry
> Again this is from IE Lab 13 Task 6.3 where the solution guide shows
DLCI 502 configured with a CIR 512k which is the access rate and I am
wondering why would you shape at the access rate?
This is the stated limit of the line's cir. This does relate back to
traditional telecom where the cir is a contracted amount and enforced by the
frame-relay switch. So I guess this lab teaches us we have some work to do
in order to prevent to many discards.
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gregory Gombas
Sent: Sunday, November 18, 2007 1:19 PM
To: Cisco certification
Subject: Frame-Relay Traffic Shaping
I noticed when you apply a map-class to a frame-relay subinterface you
still need to enable traffic shaping on the main interface.
When you enable traffic shaping on the main interface, does it
automatically shape all DLCI's to 56k?
So if you're requirement is to shape one DLCI but not impact the other
DLCI's, would you need to manually configure the CIR for the other
DLCI's? If so what value do you set them to if you don't know their
CIR?
Again this is from IE Lab 13 Task 6.3 where the solution guide shows
DLCI 502 configured with a CIR 512k which is the access rate and I am
wondering why would you shape at the access rate?
Thanks,
Greg
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