From: Jonathan V Hays (jhays@jtan.com)
Date: Fri Jun 20 2003 - 18:58:07 GMT-3
Ram,
What are you trying to accomplish here? I am confused by the partial
solutions you posted., part of which looks like part of a Class-Based
Weighted Fair Queuing (CBWFQ) solution and the other part of which looks
like Frame-Relay Traffic Shaping (FRTS). I don't know if you can combine
CBWFQ and FRTS, although the Doc CD discusses how you can combine CBWFQ
and Generic Traffic Shaping. See "Configuring Class-Based Shaping"
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fqos_c/fqcprt4/qcfcbshp.htm
If this is a CCIE Lab scenario, please state the requirements.
** mincir
In Cisco FRTS scenarios, mincir is generally fixed. The term "mincir"
usually refers to the guaranteed rate given to you by the service
provider, what the ISP might call the "CIR".
** max-reserved-bandwidth
The QoS Configuration Guide continually warns that the
"max-reserved-bandwidth" command should be used only if you want to
exceed the default of 75% of interface bandwidth reserved for QoS. Cisco
warns against using this command carelessly, in numerous places:
"The sum of all bandwidth allocation on an interface should not exceed
75 percent of the available bandwidth on an interface. The remaining 25
percent of bandwidth is used for overhead, including Layer 2 overhead,
control traffic, and best-effort traffic."
So setting "max-reserved-bandwidth" to 100% seems to be a risky idea in
most scenarios. Again, what's the situation? Why do you want to do this?
HTH,
Jonathan
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Ram Shummoogum
> Sent: Friday, June 20, 2003 4:28 PM
> To: ccielab@groupstudy.com
> Subject: CBWFQ/FRTS
>
>
> repost with subject header:
>
> Hi everyone:
>
> My questions are :
> Do I need "max-reserved-bandwidth 100" if I use traffic
> shaping as shown
> below.
> Should the mincir be equal to 112000? ( 224000/2 by default).
> I will get an error if the mincir is less than 112000 (40 +
> 30 + 30 + 12).
>
> Can I bypass the traffic shaping completely and use the service-policy
> output on interface ser0/0 + "max-reserved-bandwidth 100" .
>
>
> Thanks.
>
>
> class-map match-all icmp
> match protocol icmp
> class-map match-all smtp
> match protocol smtp
> class-map match-all ftp
> match protocol ftp
> !
> !
> policy-map test
> class icmp
> bandwidth 40
> class ftp
> bandwidth 30
> class smtp
> bandwidth 30
> class class-default
> bandwidth 12
>
>
> interface Serial0/0
> bandwidth 112
> ip address 144.1.1.1 255.255.255.0
> encapsulation frame-relay
> load-interval 30
> "max-reserved-bandwidth 100"
> no fair-queue
> frame-relay class rambo
> frame-relay traffic-shaping
> frame-relay map ip 144.1.1.2 305 broadcast
> frame-relay map ip 144.1.1.1 305
>
> map-class frame-relay rambo
> frame-relay cir 224000
> frame-relay adaptive-shaping becn
>
>
> RAM
>
>
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