From: John Underhill (stepnwlf@magma.ca)
Date: Wed Jan 08 2003 - 19:59:24 GMT-3
This is to 'match' traffic that already has the dscp bits 'set' in the ip
header, and then process them via a queuing algorithm, wred, cbwfq, wfq
etc.. What I was looking for was either a mapping instrument for cos/prec to
dscp values, or a way to set dscp bits, like 'set ip dscp' in a policy map,
available only in 2600 and up.. Good reading is.. (yes they are urls.. :o)
There's always QOS for voice to get you started, (only a couple of pages,
promise..)
http://www.cisco.com/application/pdf/en/us/guest/products/ps4032/c1069/ccmig
ration_09186a008011dfed.pdf
The 3550 configuration guide, (one of the best books I've read on switching,
and lots of QOS..)
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration
_guide_book09186a008007f368.html
Lots of stuff on this page is good..
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuratio
n_guides_books_list.html
And for QOS, cisco QOS config guide..(real page turner..)
http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_white_paper
09186a00800d6b73.shtml
Also QOS for Avvid networks is good, but I couldn't find the url.. :o(
----- Original Message -----
From: "Jennifer Bellucci" <Jennifer_bellucci@hotmail.com>
To: "John Underhill" <stepnwlf@magma.ca>; <ccielab@groupstudy.com>
Sent: Wednesday, January 08, 2003 12:57 PM
Subject: Re: DSCP
> I could be wrong or just do not understand the question. Have a look
> below...is this what you are looking for? It was taken from my c2500. Am I
> totally off the mark?
>
> Thanks
>
> r1#v
> Cisco Internetwork Operating System Software
> IOS (tm) 2500 Software (C2500-JOS56I-L), Version 12.1(5)T9, RELEASE
> SOFTWARE (f
> c1)
> TAC Support: http://www.cisco.com/tac
> Copyright (c) 1986-2001 by cisco Systems, Inc.
> Compiled Mon 25-Jun-01 01:43 by cmong
> Image text-base: 0x0307EE20, data-base: 0x00001000
>
> ROM: System Bootstrap, Version 11.0(10c), SOFTWARE
> BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c),
RELEASE
> SOFT
> WARE (fc1)
>
> r1 uptime is 37 minutes
> System returned to ROM by power-on
> System image file is "flash:c2500-jos56i-l.121-5.T9.bin"
>
> cisco 2522 (68030) processor (revision M) with 14336K/2048K bytes of
memory.
> Processor board ID 05375389, with hardware revision 00000003
> Bridging software.
> X.25 software, Version 3.0.0.
> SuperLAT software (copyright 1990 by Meridian Technology Corp).
> TN3270 Emulation software.
> Basic Rate ISDN software, Version 1.1.
> 1 Ethernet/IEEE 802.3 interface(s)
> 2 Serial network interface(s)
> 8 Low-speed serial(sync/async) network interface(s)
> 1 ISDN Basic Rate interface(s)
> 32K bytes of non-volatile configuration memory.
> 16384K bytes of processor board System flash (Read ONLY)
>
> Configuration register is 0x2102
>
> r1#t
> Enter configuration commands, one per line. End with CNTL/Z.
> r1(config)#class-map jbell
> r1(config-cmap)#match ip dscp 46
> r1(config-cmap)#match ip dscp 46 ?
> <0-63> Differentiated services codepoint value
> af11 Match packets with AF11 dscp (001010)
> af12 Match packets with AF12 dscp (001100)
> af13 Match packets with AF13 dscp (001110)
> af21 Match packets with AF21 dscp (010010)
> af22 Match packets with AF22 dscp (010100)
> af23 Match packets with AF23 dscp (010110)
> af31 Match packets with AF31 dscp (011010)
> af32 Match packets with AF32 dscp (011100)
> af33 Match packets with AF33 dscp (011110)
> af41 Match packets with AF41 dscp (100010)
> af42 Match packets with AF42 dscp (100100)
> af43 Match packets with AF43 dscp (100110)
> cs1 Match packets with CS1(precedence 1) dscp (001000)
> cs2 Match packets with CS2(precedence 2) dscp (010000)
> cs3 Match packets with CS3(precedence 3) dscp (011000)
> cs4 Match packets with CS4(precedence 4) dscp (100000)
> cs5 Match packets with CS5(precedence 5) dscp (101000)
> cs6 Match packets with CS6(precedence 6) dscp (110000)
> cs7 Match packets with CS7(precedence 7) dscp (111000)
> default Match packets with default dscp (000000)
> ef Match packets with EF dscp (101110)
> <cr>
>
> r1(config-cmap)#match ip ?
> dscp Match IP DSCP (DiffServ CodePoints)
> precedence Match IP precedence
> rtp Match RTP port nos
>
> r1(config-cmap)#match ip
> ----- Original Message -----
> From: "John Underhill" <stepnwlf@magma.ca>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, January 07, 2003 3:38 PM
> Subject: DSCP
>
>
> > Okay, with the 3550, you can map cos/tos bits to dscp values with the
mls
> qos
> > map command, but I can't find anything similar in 12.1 on a 2500.. What
I
> need
> > to know is.. how do you make the mappings between precedence values and
> dscp,
> > and/or, how do you mark incoming flows with the dscp values? With 12.2,
> you
> > can mark a flow with a class-map, but in 12.1 the option is not
available,
> > only to map with a precedence, yet, you can still use the dscp marker in
> wred
> > CBWFQ.. Any ideas?
> > .
> .
.
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