From: Roland Acra <acra@cisco.com>
Subject: Re: Mixed traffic - x25 and Ethernet
Date: 6 Jan 93 10:28:54 PST
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Willi,

Indeed, I had assumed that the output interface was a 2M leased
line, NOT an X.25 @ 2M interface. Priority queueing over X.25 is
not supported in current software.

I have no answer yet on availability of priority queueing applied
on an X.25 interface.

Thanks for the clarification.
Roland
> 
> Hallo,
> 
> in your E-Mail you are advising Lars Kalsen to look into using
> priority queuing in his environment. 
> 
> The 9.0 router manual states on page '7-4':
> 
> 	'... Also note that priority queuing does not operate 
> 	     over X.25'
> 
> This would mean that if Lars Kalsens router is connected to
> a 2 Mbit X.25 access point and not to a leased line,
> priority queing is not possible.
> 
> Has this changed for 9.1 or is there any change intended in the future?
> 
> 
> -- Willi Porten
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> E-Mail: Willi.Porten@gmd.de, Tel: +49 2241 14 3190
> GMD (German National Research Center for Computer Science)
> Dept: ISA.NW, Rathausallee 10, D-W-5205 St. Augustin 1 (Germany)
> 
> > From: Roland Acra <acra@cisco.com>
> > Message-Id: <9301051512.AA24265@ash.cisco.com>
> > Subject: Re: Mixed traffic - x25 and Ethernet
> > To: dalk@login.dkuug.dk (Lars Kalsen)
> > Date: Tue, 5 Jan 93 7:12:10 PST
> > Cc: cisco@spot.colorado.edu
> > In-Reply-To: <dalk.725926686@login.dkuug.dk>; from "Lars Kalsen" at Jan 1, 93
> >  10:18 pm
> > X-Mailer: ELM [version 2.3 PL11]
> > 
> > > We are considering a new network which connect all of our different
> > > sites through a WAN. We will probably buy some CISCO routers.
> > >
> > > The trafic which is routed through the CISCO equipment is split
> > > in two
> > >
> > >        - FTAM trafic based on x25 connections
> > >
> > >        - Interactive terminal sessions based on TCP/IP on an Ethernet.
> > >
> > > Like this:
> > >
> > >                            IIIIIIIIIIIIIIII
> > >        FTAM/X25----------> I              I
> > >                            I CISCO ROUTER I------- 2 MBit --->
> > >        TCP/IP/ETHERNET---> I              I
> > >                            IIIIIIIIIIIIIIII
> > >
> > >
> > > The CISCO routers can mix these two kinds of input intp one 2Mbit channel
> > > which connects the different sites.
> > >
> > > My concern is now : Will the interactive traffic suffer when a heavy
> > > FTAM transport is taking place ?. Will the file transfers affect the
> > > responsetimes for the interactive traffic to a large extend ?.
> > >
> > > If YOU have any experience with this please E-mail (or fax) me the
> > > information. Or if you have a reference to the litterature about this
> > > kind of setup I will appreciate that too. Or just youre opinion from
> > > your experience.
> > 
> > Hello Lars,
> > 
> > You can apply the "Priority Queueing" mechanisms on your outbound
> > interface on the router. With that, you can specify that, in case
> > of congestion, your IP traffic should take precedence over your OSI
> > traffic.
> > 
> > Priorities can be set based on protocol (IP, CLNS, DECNET, etc),
> > or application (specify TCP or UDP port numbers), or the interface
> > through which the packets entered the router, or the packet sizes.
> > 
> > Look for the keywords "priority-list" and "priority-group" in your
> > router manual.
> > 
> > Finally, please note that priority queueing is mostly useful on
> > "low-speed" interfaces (+/- up to 64Kbps), which are likely to
> > be congested. Be sure the extra overhead introduced by priority
> > queueing is worth it on a 2Mbps link.
> > 
> > Roland Acra
> > Cisco Systems, Europe
> 

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