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Configuting QoS on switch - IP Phone

Hi,

Switch port is configured as follows

mls qos

int fast eth 0/2

switchport mode access

mls qos trust device cisco-phone

spanning-tree portfast

Default Cisco IP phone marks CoS = 5 decimal and DSCP = 46 Decimal.

CoS can be used only on trunk frames. So with the above mentioned configuration of interface as access and portfast. If the interface receives a trunk frame from IP phone with the VLAN-ID and CoS marking of 5. How does the switch will respond?

Does the switch ignoes the VLAN tag and CoS marking in the 802.1 Q frame ( 802.1 P - marking).

Please share the experience.

Thanks

Subodh

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Bronze

Re: Configuting QoS on switch - IP Phone

The switch will trust the QoS value from the phone and internally perform a COS->DSCP map translation.

Regards

Edison

1 REPLY
Hall of Fame Super Bronze

Re: Configuting QoS on switch - IP Phone

The switch will trust the QoS value from the phone and internally perform a COS->DSCP map translation.

Regards

Edison

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