And I do mean long. I printed out the QoS configuration guide some weeks
ago, all 245 pages worth. Add to that the command reference, sitting in a
box on the floor. Check the switches. Check the routers. Good to go.
CCIE Lab not withstanding, QoS is looking more and more important to my
customers and potential customers. Rate shaping, policy routing, committed
access rates, I've had conversations on all of these topics lately. I did a
design for a university with a number of what they described as "inet
customers" to whom they wanted to limit available bandwidth based on certain
criteria.
I've warned before about betting anything on any particular topic being in
the Lab. However, given what the 3550 switch is capable of, I would find it
difficult to believe that there would not be some QoS tasks associated with
the device.
So what did I learn today? Not much. Just reading the definitions. I got
sidetracked with a couple of RFC's about DiffServ. Cisco's documentation
continues to talk about IP ToS bits. If I understand what I am reading from
the IETF, this is obsolete thinking, and DiffServ is the current term for
that field. 6 bits. zero thru five. count on my fingers values of 0-63.
Cisco commands show 63. RFC doesn't help. What does this al mean?
InTheZone(config)#access-list 191 permit ip any any dscp ?
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)
Peaceful thoughts. The end of another long day on the Long Road. Gentle
breezes. Cool winds. It was a beautiful day today.
Good night, everyone.
--
www.chuckslongroad.info
still a work in progress,
but at least the book list is now on line
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=52266&t=52266
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