01-04-2014 01:15 PM - edited 03-07-2019 05:22 PM
Hi Everyone,
I've got a C6504 Chassis with Sup2T with default qos configuration (auto qos default gobal command). When I use the "show platform qos ip" command I can see the following output:
QoS Summary [IPv4]: (* - shared aggregates, Mod - switch module, Sid - Switch Id, E - service instance)
(^ - class-copp keyword)
Int Sid Mod Dir Class-map DSCP Agg Trust Fl AgForward AgPoliced
Id Id
-------------------------------------------------------------------------------
CPP 1 1 In ^mcast-v4- 0 1 No 0 0 0
CPP 1 1 In ^match-igm 48 2 No 0 0 0
......
All 1 1 - Default 0 0* No 0 11780258945376 0
All 1 4 - Default 0 0* No 0 28254137334635 0
1. ¿Why I can only see traffic with DSCP=0 if I know there are traffic with different DSCP markings passing through my C6504?
The interfaces are properly configured to trust cos markings and queue traffic
MLS#show queueing interface gi1/1/1
Interface GigabitEthernet1/1/1 queueing strategy: Weighted Round-Robin
Port QoS is enabled globally
Queueing on Gi1/1/1: Tx Enabled Rx Enabled
MLS#interface GigabitEthernet1/1/1
switchport
platform qos trust cos
2. Does the Sup2T with default qos configuration rewrite to 0 all DSCP markings by default?
Thank you in advance.
01-04-2014 02:10 PM
Hi,
The architecture of QOS with Sup-2T has completely changed form Sup-720. I suggest going through this document and see what is default and what is not. As far as I know, the default ports is to trust COS, DSCP marking.
HTH
01-04-2014 02:38 PM
Yes, by default Sup2T will trust what ever QoS value (CoS for trunk port & DSCP for access port) of a incoming packet. So you do not want specific config to do so.
Below Ciscolive presentation will also help you (it is applicable for other switch platform as well) & keep it as a good reference.
BRKCRS-2501: Campus QoS Design—Simplified
HTH
Rasika
**** Pls rate all useful responses ****
01-05-2014 03:08 AM
Hi Reza Sharifi and rasikanayanajith,
Thank you for your quicky responses. I had already read the links you suggest me but I'm still confused.
1. The first link says that QoS markings (CoS or DSCP) of the incoming packet are trusted by default. Ok
2. The document also says : "Queueing behavior identical to auto qos default. Policing/marking and DSCP/CoS rewrite is disabled". Then....It seems that DSCP/CoS markings are not changed by the sup2T. Ok
3. In my network I know there is traffic with different markings (EF,CS3,....)
Then ....why does the output of the command "show platform qos ip" show only traffic with DSCP=0?
QoS Summary [IPv4]: (* - shared aggregates, Mod - switch module, Sid - Switch Id, E - service instance)
(^ - class-copp keyword)
Int Sid Mod Dir Class-map DSCP Agg Trust Fl AgForward AgPoliced
Id Id
-------------------------------------------------------------------------------
CPP 1 1 In ^mcast-v4- 0 1 No 0 0 0
CPP 1 1 In ^match-igm 48 2 No 0 0 0
......
All 1 1 - Default 0 0* No 0 11780258945376 0
All 1 4 - Default 0 0* No 0 28254137334635 0
01-05-2014 12:07 PM
What is the IOS version you are running & what is the line card in your chassis module 1 ?, the commands output seems different what I am seeing in one of my Sup2T.
CR01#sh ver | in Soft
Cisco IOS Software, s2t54 Software (s2t54-ADVENTERPRISEK9-M), Version 15.1(2)SY, RELEASE SOFTWARE (fc4)
CR01#show platform qos ip
QoS is in queueing-only mode
CR01#show queueing interface g6/1
Interface GigabitEthernet6/1 queueing strategy: Weighted Round-Robin
Port QoS is enabled globally
Queueing on Gi6/1: Tx Enabled Rx Enabled
Trust boundary disabled
Trust state: trust DSCP
Trust state in queueing: trust COS
Extend trust state: not trusted [COS = 0]
Default COS is 0
Queueing Mode In Tx direction: mode-cos
Transmit queues [type = 1p3q4t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
01 WRR 04
02 WRR 04
03 WRR 04
04 Priority 01
WRR bandwidth ratios: 100[queue 1] 150[queue 2] 200[queue 3]
queue-limit ratios: 50[queue 1] 20[queue 2] 15[queue 3] 15[Pri Queue]
queue tail-drop-thresholds
--------------------------
1 70[1] 100[2] 100[3] 100[4]
2 70[1] 100[2] 100[3] 100[4]
3 100[1] 100[2] 100[3] 100[4]
queue random-detect-min-thresholds
----------------------------------
1 40[1] 70[2] 70[3] 70[4]
2 40[1] 70[2] 70[3] 70[4]
3 70[1] 70[2] 70[3] 70[4]
queue random-detect-max-thresholds
----------------------------------
1 70[1] 100[2] 100[3] 100[4]
2 70[1] 100[2] 100[3] 100[4]
3 100[1] 100[2] 100[3] 100[4]
WRED disabled queues:
queue thresh cos-map
---------------------------------------
1 1 0
HTH
Rasika
**** Pls rate all useful responses ****
01-05-2014 03:23 PM
Advanced ip services 15.0(1)SY2
Sent from Cisco Technical Support Android App
01-06-2014 06:51 PM
Hi
Do you have "platform qos queueing-only " in your configuration ? If not see the output with this command in your config.
If you look at this document it describe what this does "Queueing behavior identical to auto qos default. Policing/marking and DSCP/CoS rewrite is disabled."
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-652042.html
HTH
Rasika
**** Pls rate all useful responses ****
01-07-2014 08:03 AM
No, I don't have the "platform qos queueing-only " command in the running-config, just the "auto qos default" global command.
This is the output of the "show auto qos default ":
#show auto qos default
"auto qos default" is configured
Earl qos Enabled port qos Enabled queueing-only No
01-13-2014 03:16 AM
Any update?
01-16-2014 01:50 PM
Hi,
Try configuring this command & see
platform qos queueing-only
See this post as well, I have replied with sample configuration that I got
https://supportforums.cisco.com/thread/2257458
HTH
Rasika
*** Pls rate all useful responses ****
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide