RE: QoS on 3550

From: Kenneth Wygand (KWygand@customonline.com)
Date: Thu Apr 22 2004 - 13:21:46 GMT-3


I'm trying to test this out as we speak. I'm trying to set the IP
Precedence in a route map assigned to a local policy in a 2500 series
router, but I'm receiving the following... is this because I cannot set
ISL or DOT1Q encapsulation on a 2500-series router? I believe I should
be able to set the TOS bit on any platform because there is a TOS field
in all IP packets.

<snip>

ip local policy route-map SETFLASH

route-map SETFLASH permit 10

 set ip precedence flash

r1#ping 10.0.0.2

*Mar 1 00:12:43.951: %SYS-5-CONFIG_I: Configured from console by
console

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:

*Mar 1 00:12:47.163: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy match

*Mar 1 00:12:47.167: IP: route map SETFLASH, item 10, permit

*Mar 1 00:12:47.171: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy reject

ed -- normal forwarding.

*Mar 1 00:12:49.163: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy match

*Mar 1 00:12:49.167: IP: route map SETFLASH, item 10, permit

*Mar 1 00:12:49.167: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy reject

ed -- normal forwarding.

*Mar 1 00:12:51.163: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy match

*Mar 1 00:12:51.167: IP: route map SETFLASH, item 10, permit

*Mar 1 00:12:51.171: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy reject

ed -- normal forwarding.

*Mar 1 00:12:53.163: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy match

*Mar 1 00:12:53.167: IP: route map SETFLASH, item 10, permit

*Mar 1 00:12:53.167: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy reject

ed -- normal forwarding.

*Mar 1 00:12:55.163: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy match

*Mar 1 00:12:55.167: IP: route map SETFLASH, item 10, permit

*Mar 1 00:12:55.167: IP: s=10.0.0.1 (local), d=10.0.0.2, len 100,
policy reject

ed -- normal forwarding.

Success rate is 0 percent (0/5)

</snip>

Any ideas?

Kenneth E. Wygand
Systems Engineer, Project Services

CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
Network+, A+
Custom Computer Specialists, Inc.

"I am not really smart. I just stick with problems longer."
-Albert Einstein

Custom Computer Specialists, Inc.

"Celebrating 25 Years of Excellence"

-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Thursday, April 22, 2004 11:57 AM
To: Group Study
Subject: QoS on 3550

Hi guys,

I'm trying to understand something which has me confused.

Recall these facts:

At layer 2, only ISL or 802.1q trunks have fields to carry layer 2 QoS
info.

Regular ethernet frames don't and can't carry any QoS info.

Given the above,

Q1) Can cos be set on frames coming into or going out of regular access
port on a 3550?

Q2) If so, how does this work?

Q3) Can someone confirm that's there's no problem or Gotcha's on
setting layer 3 QoS on frames coming into or leaving a regular access
port?

Thanks in advanced, Tim

[GroupStudy removed an attachment of type image/gif which had a name of image001.gif]



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