Cisco Router PQ problem

[defireman]

Hi,

I am having a problem trying to specify PQs in a Cisco 7300 router.

I am using access lists to specify matching rules for packets to go into a high priority queue. However, despite the packets matching the access-list (indicated in logs), those packets does not seem to be entered into the high priority queue at all, and there was no difference in loss rates.

These are the commands I used to configure the PQ:
access-list 102 permit tcp any eq 1000 any log
!
priority-list 4 protocol ip high list 102
!
interface gigabitethernet0/1
priority-queue 4



Typing "show interfaces" shows that the policy is indeed applied to the interface. Is there something I did wrong?

 

[KiscoKid]

On the interface, I believe the command is:

interface gigabitethernet0/1
priority-group 4

 

[defireman]

Oops, I meant priority-group 4.

Yes. I used show interfaces to check that the group is indeed assigned. It's just that the router seems to refuse to heed the rules and put the packets into the high priority queue. Is there anything else that I missed?

Thanks anyway!

 

[jneiberger]

It appears that you've done it correctly. I would suspect a bug. What IOS are you running?

 

[defireman]

I'm using Cisco IOS 12.3(b) RELEASE

This is the output of "show version":
Cisco Internetwork Operating System Software
IOS (tm) 7301 Software (C7301-IS-M), Version 12.3(3b), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Wed 05-Nov-03 23:24 by kellythw
Image text-base: 0x60008954, data-base: 0x61B7E000

ROM: System Bootstrap, Version 12.2(8r)B3, RELEASE SOFTWARE (fc1)
BOOTLDR: 7301 Software (C7301-BOOT-M), Version 12.2(14)SZ2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

r-c7300-32-a uptime is 44 weeks, 3 days, 57 minutes
System returned to ROM by power-on
System restarted at 12:19:16 cdt Fri Apr 22 2005
System image file is "disk0:c7301-is-mz.123-3b.bin"

Does it help in analyzing my problem?

 

[jneiberger]

I just took a quick look and saw a few priority queueing bugs in that release but I didn't see this specific one. You might want to upgrade, though, because early releases of 12.3 are very buggy. The release you're using isn't available from CCO any longer. If you have CCO access, try upgrading to 12.3(17a) and seeing if that resolves the problem.

 

[defireman]

jneiberger, thanks for the info!

If you can point me to the source of your information, I'd be extremely thankful.

 

[jneiberger]

http://www.cisco.com

Seriously, if you have CCO access, look for the Software Bug Toolkit. That will allow you to search for bugs. The Software Center area has the currently available IOS releases.

 

[jneiberger]

Here's another thought. I'm not a big fan of priority queueing. Have you tried Class-based Weighted Fair Queuing or LLQ?

 

[defireman]

It's a part of my experiment I'm doing for research, so I'd have to use PQ to run some tests on my testbed. I'll keep it in mind though, thanks!