From: Todd, Douglas M. (DTODD@PARTNERS.ORG)
Date: Thu Feb 21 2008 - 15:56:29 ARST
Hmm -- some light heading your way I hope and not a dark spot...
Some correct me if I'm incorrect:
When you apply QoS to a circuit it takes 75% of the bandwidth, 25% is set for
control and IGP (etc). If you need to reserve %20 percent, I would assume that
it's 20% of the interface bandwidth, thus a max-bandwidth statement must be
applied. Then you are taking %20 of the interface bandwidth and not %20 of %75
of the interface bandwidth.
Thus you are working with 75% of the interface bandwidth (sh int | i BW) (no
max-bandwidth statement).
Q2: If you are not using max-bandwidth then its %20 of the %75 interface BW. CIR
is just the threshold of where you want the DE bit to be set. But obviously it's
part of the Bc/Be formulas.
Douglas
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Radioactive Frog
Sent: Wednesday, February 20, 2008 7:13 PM
To: Cisco certification
Cc: ccie forum
Subject: Frame-relay trafic shaping
FRTS question folks,
Q1. in QoS class-map statement, if we have to reserve 20% bandwidth - will that
be calculated from Frame-relay CIR???? (CIR=95% of BW). I am not sure....
Q2. Also if we have to allocate 20% bandwidth for signaling traffic - will that
be calculated from CIR? or Total Bandwidth?
can someone shed some light on this please....
Frog
interface Serial6/0
description Parent FR Link for BRANCH#60 no ip address encapsulation frame-relay
frame-relay traffic-shaping !
interface Serial6/0.60 point-to-point
description FR Sub-Interface for BRANCH#60 bandwidth 256
frame-relay interface-dlci 60 ppp Virtual-Template60 ! Enables MLPoFR class
FRTS-256kbps ! Binds the map-class to the FR DLCI
!
interface Virtual-Template60
bandwidth 256
ip address 10.200.60.2 255.255.255.252
service-policy output WAN-EDGE ! Attaches MQC policy to map-class ppp multilink
ppp multilink fragment-delay 10 ! Enables MLP fragmentation ppp multilink
interleave ! Enables MLP interleaving !
!
map-class frame-relay FRTS-256kbps
frame-relay cir 243200 ! CIR is set to 95% of FR DLCI rate frame-relay bc 2432 !
Bc is set to CIR/100 frame-relay be 0 ! Be is set to 0 frame-relay mincir 243200
! MinCIR is set to CIR
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