Look at "show mls qos map" to see the defaults that may be rewriting your information depending on trust (or non-trust) mechanisms you have configured.
If you trust CoS, a frame received with cos5 and dscp46 will get rewritten to dscp 40 with default maps... "show mls qos interface (intf)" is also good to see status. Scott Bogdan wrote: > hello > > indeed, a fellow nanoger gave me this hint. > > 1. i had to enable mls qos globally in "network" switches > 2. set the mls qos trust dscp on the uplinks (ingress port) > > > thanks > > ps thanks to andrey.gordon too :) > > > > > > On 11/12/2009 03:21 PM, Brian Feeny wrote: > >> You should make sure that any links that go between devices have trust >> set. In your case if your doing DSCP, >> then make sure each link that goes between devices which must carry >> tagged packets have trust dscp set. >> >> Brian >> >> On Nov 12, 2009, at 5:11 AM, Bogdan wrote: >> >> >>> hello >>> >>> i am playing with qos on some devices >>> - cisco 3560 >>> - cisco 7609 >>> and i have some things that i don't seem to understand. >>> >>> 1. in 3560, i enable mls qos, on the ingress port applyed policy map, >>> classify the packets with acl, mark, all good. on the egress ports i use >>> srr-queue with shape/share, everything is fine, it is working. >>> >>> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_20_se/configuration/guide/swqos.html#wp1028614 >>> >>> >>> >>> 2. reset to defaults the 3560 >>> in 7606 i pick up a vlan, and apply a policy-map and set dscp 40 on >>> egress of that vlan >>> 3560 in uplinked in 7609 >>> in 3560 i can see the "marked" packets, and i have matches on the dscp >>> set earlier (sh mls qos int xx stat). >>> the problem is: when i apply the srr-queue in 3560 on egress (towards >>> the test port), it does not work. >>> if i enable mls qos on 3560, i cannot match anymore the dscp 40 from the >>> 7609 >>> >>> is it normal? do i have to apply the qos stuff (point1) on all switches >>> i want qos on? i mean, i cannot set dscp in one "core" device and use >>> that in the whole network ? >>> >>> >>> thanks >>> >>> >>> >> > > > > >
