From: Scott Morris (swm@emanon.com)
Date: Thu Dec 04 2003 - 14:32:06 GMT-3
I would just say it is best to read the entire lab scenario before
making your determination. Of course, real life applications may vary!
If you are doing traffic-shaping per BECN's, then it will likely be
mincir to be the lowest information sent. If you're not doing shaping,
or if you are dealing with an over-subscribed line (theorhetical
maximum) then you may want totarget the CIR to be what is guaranteed by
the provider, and adjust from there.
Read the scenario carefully and ask the proctor as necessary for
clarification.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Pun, Alec CL
Sent: Thursday, December 04, 2003 10:43 AM
To: Scott Morris; ccielab@groupstudy.com
Subject: RE: FR CIR ??
thanks scott.
Here is the answer that comes with the workbook :
guaranteed traffic ==> mincir
link capacity ==> cir
agreed ? Personally, I will use guaranteed traffic as CIR and use the
link capacity (i.e. AR) to calculate the Be. Any comments ?
alec
-----Original Message-----
From: Scott Morris [mailto:swm@emanon.com]
Sent: Thursday, December 04, 2003 8:31 PM
To: Pun, Alec CL; ccielab@groupstudy.com
Subject: RE: FR CIR ??
As with everything else, it depends on your perspective!
Guaranteed traffic is the bare minimum that you can push through the
circuit, that your provider says will go through because you pay for it.
It's the MinCIR from a purely theorhetical throughput scenario. Although
if you aren't required to pay attention to BECNs and do any sort of
backoff, it becomes your CIR. If you don't trust your service provider
and provide a "just in case" option, then it becomes CIR and you'll
still back off to something lower than that.
If your link capacity is 128K, that is most likely your Access Rate, or
full link speed. This is useful to know for the bandwidth command if
you are doing any queuing stuff. It's also useful for calculating your
be information in FRTS.
Now, of course, there is always the human factor of it depends on who
wrote the lab and what they were thinking. Check your lab diagrams for
any information about clocking speeds of serial lines (hence your AR).
Or, if in doubt of whether the "link capacity" means AR or not, ask the
proctor. They are there to help!
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
CISSP, JNCIS, et al. IPExpert CCIE Program Manager IPExpert Sr.
Technical Instructor swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Pun, Alec CL
Sent: Thursday, December 04, 2003 3:52 AM
To: ccielab@groupstudy.com
Subject: FR CIR ??
If the question mentioned "The FR service provider is guaranteeing
32kbps of traffic", would you intepret as CIR or minCIR ? How about "FR
access being provided by the service provider has a link capacity of
128kbps" ? Sometimes I am confused by the terms which one should be
used.
thanks
alec
This archive was generated by hypermail 2.1.4 : Sat Jan 03 2004 - 08:25:35 GMT-3