Class-map: Difference between 'match vlan' and 'match input-interface vlan'

[mkato]

Does anyone know the difference between using 'match vlan' and 'match input-interface vlan' in a class-map on a Cat 4500?

I want to set the DSCP value based on VLAN ID. The Cat 3550 offers 'vlan' as a match selection inside the class-map, while the 4500 doesn't, unless you further qualify it with 'input-interface.' The help description says "Catalyst VLAN..." The docs appear weak on this issue.

[umedryk]

Hi Kato,

Probably, one way it to set dscp statically for the porth while you keep it as untrusted.

[mkato]

Thanks for the reply. As it turns out, 'match input-interface' isn't supported on the C4500 (probably 4000 as well) platform. So basically, matching on the VLAN ID isn't an option on that platform. Another platform-related quirk is CEF, hence ip routing, needs to be enabled to set the dscp value.