From: asadovnikov (asadovnikov@comcast.net)
Date: Fri Dec 05 2003 - 03:34:31 GMT-3
Generally I would:
- for traffic which is allowed to burst over Telco-CIR (configuration
often use when VC transports data) configure router-cir equal to
Telco-access-rate and router-mincir equal to Telco-CIR
- for traffic which is not allowed to burst over Telco-CIR (usually
when VC is used for real time traffic such as voice over IP)
configure router-cir and router min-cir equal to Telco-CIR, as
well set Tc small enough and implement fragmentation on the
router to support real rime budget
- ensure that Telco-access-rate is larger or equal to Telco-CIR
- never use over the CIR bursting (Be)
- implement queuing as appropriate (i.e. LLC for real time traffic)
This based more on real life rather then CCIE LAB but I see no
reason to do anything different in the CCIE LAB assuming further
Limitations are not imposed by the question(s).
Best regards,
Alexei
-----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
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