From: Scott Morris (swm@emanon.com)
Date: Mon Nov 07 2005 - 09:18:42 GMT-3
That's always the catch! Most frame-relay providers will allow you to
"burst to port speed" or at least burst above the CIR they sell you.
The key concept to remember is that the CIR you buy from your SP is a
guarantee, which logically means you shouldn't ever need to go BELOW that,
since you paid for it! Now, how much above that you will consistently get
through the line (since, as you note, it's flagged DE) becomes sort of a
game. The "cir" that Cisco pegs is one that we need to engineer (fancy word
for guessing with a few tests involved). That's the target that we can
reasonably acheieve.
The mincir we set on our routers is that minimum level to back off to if
there's congestion. It certainly shouldn't be anything lower than what we
pay for and are guaranteed to get.
In the lab, do whatever the lab tells you! In real life, there's some
playing around, and if whatever you come up with doesn't consistently work
for you, then you either need to pick different numbers, or pay for more cir
from the SP.
It's all a game though.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Wang, Ting (Taylor)
Sent: Monday, November 07, 2005 5:04 AM
To: ccielab@groupstudy.com
Subject: relationship between CISCO CIR / MinCIR and Telco CIR
Hi All,
I was told "The miniCIR is Cisco concept, it is actually CIR of Telco! if
Cisco router sends out data over miniCIR, the Telco thinks it is over
normal CIR!!! so DE is marked."
If miniCIR is actually CIR of Telco, how should we select the CIR value of
the CISCO box?
Thanks,
Taylor
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