RE: 3550 QoS

From: Snow, Tim (timothy.snow@eds.com)
Date: Wed Jan 21 2004 - 00:38:57 GMT-3


The values are used internally when the switch maps cos to dscp for queueing
purposes.

T
#12042

-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Tuesday, January 20, 2004 7:13 PM
To: Group Study
Subject: 3550 QoS

Hi,

If you do a "show mls qos map", one of the tables you'll find according to
the 3550 command reference is the DSCP-to-Switch Priority and it looks like
this:

Dscp-switch priority map:
     d1 : d2 0 1 2 3 4 5 6 7 8 9
     ---------------------------------------
      0 : 00 00 00 00 00 00 00 00 00 00
      1 : 00 00 00 00 00 00 01 01 01 01
      2 : 01 01 01 01 01 01 01 01 01 01
      3 : 01 01 02 02 02 02 02 02 02 02
      4 : 02 02 02 02 02 02 02 02 03 03
      5 : 03 03 03 03 03 03 03 03 03 03
      6 : 03 03 03 03

See the following link:

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12119ea1/3550cr/cl
i
2.htm#2418454

It seems to me that this Switch Priority has nothing to do with Spanning
Tree (true?). I tried finding out what they mean by "Switch Priority", but
didn't come up with anything. Can anybody tell me what "Switch Priority" is
and where I can find additional info on it?

Thanks in advance, dt



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