From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Tue Jan 16 2001 - 23:37:11 GMT-3
Don't forget about Generic Traffic Shaping (GTS), which is always an
option.
Brian
On Tue, 16 Jan 2001, Roger Dellaca wrote:
> as far as CAR, I think it's a good solution, but the lab was written in Sep 9
9 (se the "topology" page), was CAR even around? The best solution now may not
be the answer at that time.
>
> I can see the logic of wanting to put the traffic-shape on both ends. In the
answer given, the access-l has telnet as the destination, and it's on the rout
er with the referenced token-ring, so the packets are sourced from the token ri
ng with destinations of telnet daemons somewhere else in the network, as you st
ate.
>
> So the logic I would attach to this is that it will slow down the input to te
lnet if you cut & paste large volumes of commands! - but has no effect on the
speed with which you receive back screens.
>
> >>> "Connary, Julie Ann" <jconnary@cisco.com> 01/10 2:17 PM >>>
> That's what I thought of doing at first - and then the lab answer was
> to use traffic -rate shaping on the serial so I questioned why only on
> one side.
>
> This is the fatkid lab on performance and queing at fatkid.com
>
> Also - does token-ring support CEF? The docs say you have to have CEF to do
> CAR.
>
> Julie ann
>
> At 08:04 PM 1/10/2001 +0200, you wrote:
> >Ann,
> >
> >What about using input and output CAR on R3?
> >This way shouldn't you force telnet (TCP) to back-off due to the windowing
> >mechanism?
> >Objections?
> >
> >-----Original Message-----
> >From: Connary, Julie Ann [mailto:jconnary@cisco.com]
> >Sent: Wednesday, January 10, 2001 3:53 PM
> >To: ccielab@groupstudy.com
> >Subject: traffic shaping on a serial line
> >
> >
> >Hi,
> >
> >if you have the following:
> >
> >
> >
> >R1 --------serial at 64K ---------------R3 --------Token Ring
> >
> >You want to limit the users on the token ring from telnet using over 32K of
> >the bandwidth,
> >
> >So I know on R3 you would use GTS to limit telnet to 32K.But what about the
> >reverse traffic coming from R1?
> >
> >Don't you have to traffic shape there too? The fatkid labs only shape on
> >one side of the link - the R3 side.
> >Seems to me that in telnet you issue a command and get a screenfull of data
> >- so more traffic would
> >be coming back and you would want to also limit on the R1 side. Thoughts?
> >
> >I guess you would assume that the telnets are ONLY sourced from the
> >TokenRing - so
> >your access-list on R1 would have to be:
> >
> >access-list 101 permit tcp any eq telnet any
> >
> >vs. the access-list on R3:
> >
> >access-list 101 permit tcp any any eq telnet.
> >
> >
> >Julie Ann
> >
> >------------------------------------------------------------------------
> > Julie Ann Connary
> > | | Network Consulting Engineer
> > ||| ||| Federal Support Program
> > .|||||. .|||||. 13635 Dulles Technology Drive,
> >Herndon VA 20171
> > .:|||||||||:.:|||||||||:. Pager: 1-888-642-0551
> > c i s c o S y s t e m s Email: jconnary@cisco.com
> >
> >------------------------------------------------------------------------
> >
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