From: Petr Lapukhov (petrsoft@gmail.com)
Date: Wed Apr 05 2006 - 05:28:21 GMT-3
Well, actually, that depends on task wording.
As a matter of fact, legacy FRTS is more simple to configure,
then MQC FRTS, so you may probably want to stick with it
for most configs.
Just remember, that you can use legacy FRTS *and* engage a
per-VC CBWFQ (not the same as MQC FRTS!).
Basically, you catch per-VC CBWFQ by seeing words like:
guarantee 80% of bandwith in case of congestion, etc. Just remember
that CBWFQ takes interface bandwidth from minCIR value.
On the other hand, you can do the same shaping things and much
more with MQC FRTS. You can do per-class policing, for instance,
or engage WRED. (legacy WRED works only on main interface).
The only thing you can't do with MQC FRTS is FRF.12 fragmentation.
(this must me done within map-class or on main interface).
And there are some things, that you may do *only* with MQC FRTS -
e.g. Voice Adaptive Traffic Shaping, class-based header compression.
HTH
Petr.
2006/4/5, Michael <mamiller2@comcast.net>:
>
> What is the difference of completing this task in policy-map vs. class-map
> for FRTS? I know one is applied to service-policy. Any others? Does it
> yield same goal? Any advantages or notes to one particular method?
>
> Brians?
>
>
>
> CR5-2651(config-pmap-c)#shape ?
> adaptive Enable Traffic Shaping adaptation to BECN
> average configure token bucket: CIR (bps) [Bc (bits) [Be
> (bits)]],
> send out Bc only per interval
> fecn-adapt Enable Traffic Shaping reflection of FECN as BECN
> fr-voice-adapt Enable rate adjustment depending on voice presence
> max-buffers Set Maximum Buffer Limit
> peak configure token bucket: CIR (bps) [Bc (bits) [Be
> (bits)]],
> send out Bc+Be per interval
>
> -----------------------------------------------------------
>
>
> CR5-2651(config)#map-class frame-relay ?
> WORD Static map class name
>
> CR5-2651(config)#map-class frame-relay vc1
> CR5-2651(config-map-class)#?
> Static maps class configuration commands:
> default Set a command to its defaults
> exit-class Exit from static map class configuration mode
> frame-relay Configure Map parameters
> help Description of the interactive help system
> no Negate a command or set its defaults
> service-policy class-based service policy
>
> CR5-2651(config-map-class)#fram
> CR5-2651(config-map-class)#frame-relay ?
> adaptive-shaping Adaptive traffic rate adjustment, Default = none
> bc Committed burst size (Bc), Default = 56000 bits
> be Excess burst size (Be), Default = 0 bits
> cir Committed Information Rate (CIR), Default = 56000 bps
> congestion Congestion management parameters
> custom-queue-list VC custom queueing
> end-to-end Configure frame-relay end-to-end VC parameters
> fair-queue VC fair queueing
> fecn-adapt Enable Traffic Shaping reflection of FECN as BECN
> fragment fragmentation - Requires Frame Relay traffic-shaping
> to
> be
> configured at the interface level
> holdq Hold queue size for VC
> idle-timer Idle timeout for a SVC, Default = 120 sec
> interface-queue PVC interface queue parameters
> ip Assign a priority queue for RTP streams
> mincir Minimum acceptable CIR, Default = CIR/2 bps
> priority-group VC priority queueing
> tc Policing Measurement Interval (Tc)
> traffic-rate VC traffic rate
> voice voice options
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Petr
> Lapukhov
> Sent: Tuesday, April 04, 2006 10:33 PM
> To: Todd.Osterberg@compucom.com
> Cc: ccielab@groupstudy.com
> Subject: Re: FRTS Theory Question
>
> Hi Todd,
>
> This question is being discussed over time on GS.
>
> Basically, you lower Tc (smller burst) when you need
> to deliver some sort of delay-sensitive traffic (voice).
>
> The best thing you can read on this topic is
> B. Dennis' presentation at
>
> http://www.internetworkexpert.com/resources/01700368.htm
>
> HTH
> Petr
>
> 2006/4/5, Todd.Osterberg@compucom.com <Todd.Osterberg@compucom.com>:
> >
> > I am trying to understand how IOS works under the hood, so to speak,
> > when performing frts. I understand the formula of T=Bc/CIR. If I
> > configure a map-class with a CIR value why do I need to specify a Bc.
> > Since the default of T is .125 seconds and I have then provided the CIR,
> > why doesn't IOS solve for Bc? Here is my configuration example:
> >
> >
> >
> > Initial configuration:
> >
> >
> >
> > map-class frame-relay frts
> >
> > frame-relay cir 128000
> >
> >
> >
> > Rack1R1#sh traffic-shape
> >
> >
> >
> > Interface Se0/0
> >
> > Access Target Byte Sustain Excess Interval Increment
> > Adapt
> >
> > VC List Rate Limit bits/int bits/int (ms) (bytes)
> > Active
> >
> > 105 128000 2000 128000 0 125 2000 -
> >
> >
> >
> >
> > When the map-class is modified to include a Bc, the results are
> > different:
> >
> >
> >
> > map-class frame-relay frts
> >
> > frame-relay cir 128000
> >
> > frame-relay bc 16000
> >
> >
> >
> > Rack1R1#sh traffic-shape
> >
> >
> >
> > Interface Se0/0
> >
> > Access Target Byte Sustain Excess Interval Increment
> > Adapt
> >
> > VC List Rate Limit bits/int bits/int (ms) (bytes)
> > Active
> >
> > 105 128000 2000 16000 0 125 2000 -
> >
> >
> >
> >
> > Any thoughts as to why FRTS works this way?
> >
> >
> >
> >
> >
> > Todd
> >
> >
> >
> >
> >
> >
> >
> > Todd Allen Osterberg
> > Senior Consultant, Professional Services US Western Region
> >
> > CompuCom
> > eMail: todd.osterberg@compucom.com
> > T: (916) 577-1066
> > C: (916) 316-4650
> > www.CompuCom.com
> > <outbind://4-0000000078027C4F809C5F448BBD4AD06CC1CD9207005BA671B4ADEFD54
> > 18728E128462975250000000D51F50000B7CF08D69463BB4FA89400956DFA551A0000010
> > 7CF9A0000/exchweb/bin/redir.asp?URL=http://www.CompuCom.com>
> >
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