cos behavior

Question is why is there an Cos0 when having R1 with cos6 and Sw1 with cos2,
it does not matter if the vlan is tagged or untagged as expected.

I am doing some testing and config.

Topology

R1---------
                |
                |---------SW1--------SW2-----------R3
                |
R2---------

R1
!
interface FastEthernet0/0.100
 encapsulation dot1Q 100 native
 ip address 10.1.1.1 255.255.255.0
 service-policy output Ecos6
end

SW1 different but trunk to R1 only the Cos that changes

R3 just a verification point
!
interface FastEthernet0/1.100
 encapsulation dot1Q 100
 ip address 10.1.1.3 255.255.255.0
 service-policy input cos0-7
end

This is the result

One
MLS QoS enabled on switch and q-tagged vlan
R1 always cos6 out
R3 just verification
SW1 diffrent config.

-Sw1 cos2
 result cos0 on R3 = why?
-Sw1 cos2 and trust cos
 result cos6 on R3 = OK
-Sw1 cos2 and override
 result cos2 on R3 = OK

Two
MLS QoS enabled on switch and Native Vlan
R1 always cos6 out
R3 just verification
SW1 diffrent config.

-Sw1 cos2
 result cos0 on R3 = why?
-Sw1 cos2 and trust cos
 result cos2 on R3 = OK
-Sw1 cos2 and override
 result cos6 on R3 = OK

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Received on Wed Jan 04 2012 - 16:47:06 ART