From: Roberto Fernandez (rofernandez@us.telefonica.com)
Date: Tue Jun 27 2006 - 19:26:50 ART
Sam,
As soon as you enter the "frame-relay traffic shaping" command you will
be (by default) telling to your router to use 56Kbps as the CIR on each
PVC. As you see, now you have to fix this, and you tell the router to
use 768Kbps since this is your target rate and you are mandated to
adhere to it. That is:
frame-relay cir 768000
Here the MINCIR makes no point. You need MINCIR on the following cases:
1-You are using adaptive-shaping, which implies you are willing to
decrease your speed down to MINCIR value
2-You are reserving bandwidth (using a policy-map and the bandwidth
command), then you need to specify MINCIR because the routers calculates
its available bandwidth from this value and by default MINCIR is half of
the CIR.
An example can show you:
!
!
Interface Serial0/0
frame-relay traffic shaping
frame-relay class SHAPED
!
map-class frame-relay SHAPED
frame-relay cir 786000 !!!(here you are implying a MINCIR of 384000)
service-policy out PRIORITY_BANDWITH
!
class-map match all VOICE
match protocol rtp
!
policy-map PRIORITY_BANDWITH
class VOICE
priority 512
!
!
If you try to use the configuration it will not work, the router will
complain of not having enough bandwidth to reserve as priority for you.
You are requesting 512000 and it has only available its default MINCIR
of 384000) in this case if you ADD frame-relay mincir 768000 then you
will be able to reserve some bandwidth. Your map class would be:
map-class frame-relay SHAPED
frame-relay cir 786000 !!!(here you are implying a MINCIR of 384000)
frame-relay mincir 768000 !!!(you are making all your bandwidth
available)
service-policy out PRIORITY_BANDWITH
Best Regards,
Roberto
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
san
Sent: Tuesday, June 27, 2006 12:56 PM
To: Cisco certification
Subject: IE WB lab 7, ver 3, section 8.2
Hi all,
Why or when do we use "frame-relay cir 768000" instead of "frame-relay
mincir 768000".
Based on the question i assume it would be mincir but wasnt. Could you
clarify.
Question Says:
Frame Relay interfaces of R3, R4 and R5 are all clocked at T1 speed by
the
FR SP. However since R5 only has a single connection to the FR cloud,
each
VC on R5 has been equally provisioned a cir of 768k by the telco.
Configure all endpoints of the FR network to adhere to the provisioned
CIR.
-- Thanks & Rgds SAN
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