From: kym blair (kymblair@hotmail.com)
Date: Sat Feb 15 2003 - 00:56:41 GMT-3
Several questions, mostly on bandwidth:
(1) Could the "service-policy out DLSW&IP" statement be moved from the
interface to the map-class?
(2) Your example shows the PVC of 9600 bandwidth, so wouldn't the max
CIR=7200 (i.e., 75 percent of available bandwidth can be allocated for
CBWFQ)?
(3) If you were applying this on a multipoint subinterface with two DLCIs,
would you configure as follows, and (my big question) would you have to cut
the CIR in half (so each DLCI can only get up to 3600)?
interface serial 0.1 point-to-multipoint
frame interface-dlci 102
class qos
frame interface-dlci 103
class qos
(4) And finally, suppose you have two subinterfaces, one as described in #3
where you want to apply QOS, and another multipoint with 2 DLCIs that you
don't want to apply QOS ... would you cut the CIR in half again?
Thanks, Kym
>From: Tim Fletcher <tim@fletchmail.net>
>Reply-To: Tim Fletcher <tim@fletchmail.net>
>To: "Ryan B" <ryanb@pobox.com>, "Sage Vadi" <sagevadi@yahoo.co.uk>,
><ccielab@groupstudy.com>
>Subject: Re: FRTS & CBWFQ Date: Fri, 14 Feb 2003 14:30:16 -0500
>
>Don't forget to turn traffic shaping on under the interface config.
>
>interface Serial5/1/1
> frame-relay traffic-shaping
>
>-Tim Fletcher
>
>At 09:00 AM 2/14/2003 -0800, Ryan B wrote:
>>Few things of note...
>>
>>1) I would remove the "class-map ipTraff" and in the policy-map use "class
>>class-default"
>>2) "bandwidth 50" is saying to use 50kb/sec of bandwidth - have you tested
>>this configuration? Does it work? It should error out when you try to
>>apply the config since you are exceeding the mincir value
>>3) In the FRTS config you have no CIR defined and it defaults to 56k...
>>Also, the bc is not the burst size, it is the the amount of data to send
>>per
>>Tc interval... This value is dependent on the type of data and the CIR of
>>a
>>PVC... For your 9.6k PVC the value would be "Bc = CIR/8" (note that for
>>VoIP you would set it to "Bc = CIR/100" to reduce delay)
>>4) I generally set the burst (Be) to 25% of the CIR for non VoIP carrying
>>circuits, assuming of course that the access rate of the line is not equal
>>to the CIR. For voice, Be should be 0 (and it defaults as such)... Keep
>>in
>>mind that the Bc is not the rate in kbps as you have configured. It is
>>the
>>amount of excess data in bits to send during the first Tc interval where
>>congestion occurs. I guess you could calculate the Bc to an specific kbps
>>value by using the Tc ("Tc = Bc/CIR") to figure out what value for Be
>>would
>>give you the desired 19.2kbps...
>>
>>So I'd try something like this (though there could be errors in here, I'm
>>just spitting this out based on your config and my weak memory). Also,
>>this
>>would not have you bursting to 19.2... Can't give you all the answers now
>>can I ;))
>>
>> interface Serial5/1/1
>> service-policy output DLSW&IP
>> frame-relay class qos
>>
>> class-map dlswTraff
>> match access-group 150
>>
>>policy-map DLSW&IP
>> class dlswTraff
>> bandwidth percent 50
>> class class-default
>> bandwidth percent 50
>>
>> map-class frame-relay qos
>> frame-relay cir 9600
>> frame-relay mincir 9600
>> frame-relay bc 1200
>> frame-relay be 2400
>> no frame-relay adaptive-shaping
>>
>>access-list 150 permit tcp any eq 2065 any
>>
>>There is an page on the Cisco site that covers this very well, something
>>titled "Configuring Frame Realy Traffic Shapping", but I don't have the
>>URL
>>handy.
>>
>>----- Original Message -----
>>From: "Sage Vadi" <sagevadi@yahoo.co.uk>
>>To: <ccielab@groupstudy.com>
>>Sent: Friday, February 14, 2003 6:16 AM
>>Subject: QoS: FRTS & CBWFQ
>>
>>
>> > All,
>> >
>> > Q) On R1 configure the QoS default for the frame-relay
>> > network to have a comitted information rate of 9600bps
>> > and a burst size of 19200bps. Configure DLSW traffic
>> > with 50% of the traffic followed by IP with 50%, apply
>> > this to the map class in the step above.
>> >
>> > My Config:
>> >
>> > interface Serial5/1/1
>> > service-policy output DLSW&IP
>> > frame-relay class qos
>> >
>> > class-map dlswTraff
>> > match access-group 150
>> > class-map ipTraff
>> > match access-group 1
>> >
>> > policy-map DLSW&IP
>> > class dlswTraff
>> > bandwidth 50
>> > class ipTraff
>> > bandwidth 50
>> >
>> > map-class frame-relay qos
>> > frame-relay bc 19200
>> > frame-relay mincir 9600
>> > no frame-relay adaptive-shaping
>> >
>> > access-list 1 permit any
>> > access-list 150 permit tcp any eq 2065 any
>> >
>> > Q) Does this seem to be correct config?
>> >
>> >
>> >
>> >
>> >
>> >
>> > __________________________________________________
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