Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Trying to trust cos value on a 2821 port

I am trying to trust the cos value for trunk port fa 0/0/0 on a 2821 router. The trunk port is on a HWIC-4ESW 4 port switch module. I have configured the port to trust cos, but when I run the command "show mls qos interface" the port state shows "untrusted".

router#show mls qos interface

FastEthernet0/0/0

trust state: not trusted

trust mode: trust cos

COS override: dis

default COS: 0

pass-through: none

Here is the interface config:

interface FastEthernet0/0/0

switchport mode trunk

duplex full

speed 100

mls qos trust cos

arp timeout 270

hold-queue 300 in

hold-queue 300 out

!

Any ideas if the port is actually trusted and passing QOS markings?

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Trying to trust cos value on a 2821 port

"mls qos trust" command does not support. But the port should put the packet with COS 4-7 into high priority queue automatically.

Please refer to the following Q&A.

http://www.cisco.com/en/US/prod/collateral/routers/ps5853/prod_qas0900aecd8016c026_ps5855_Products_Q_and_A_Item.html

3 REPLIES

Re: Trying to trust cos value on a 2821 port

HWIC-4-ESW does not support mls qos trust options ( cos or dscp ). These CLIs are successfullt taken giving the impression that configurations are effective .. but they are not.

New Member

Re: Trying to trust cos value on a 2821 port

Ok, so I can only tag the traffic on the HWIC-4-ESW on a per-port basis? There is no way for the port to trust the COS markings that are already on the traffic passing through the port?

Here is what the product page says.

http://www.cisco.com/en/US/prod/collateral/routers/ps5853/product_data_sheet0900aecd8016bf0b_ps5855_Products_Data_Sheet.html

802.1P QoS (Traffic Prioritization) This feature provides support for QoS based on the IEEE class of service (CoS) and port-based prioritization, allowing the switch to change the CoS settings of tagged packets on a per-port basis.

Re: Trying to trust cos value on a 2821 port

"mls qos trust" command does not support. But the port should put the packet with COS 4-7 into high priority queue automatically.

Please refer to the following Q&A.

http://www.cisco.com/en/US/prod/collateral/routers/ps5853/prod_qas0900aecd8016c026_ps5855_Products_Q_and_A_Item.html

432
Views
0
Helpful
3
Replies