Re: Catalyst QoS trust DSCP with double tagged Ethernet frames
You are right DSCP is not modified.
But question is if at all switch recognizes IP inside double tagged Ethernet frame.
To be more precise. If for example one IP packet inside double tagged frame has DSCP 46 (EF)value and other 34 (AF21) will these Ethernet frame mapped to different egress queue or to the same queue.
Normally switch should map to differnet queues according to switch default DSCP to output queue map.
But again I am asking if switch correctly recognize IP traffic.
I suppose switch logic is following:
Check first Ethertype field. It is 8100 for VLAN. Next check second Ethertype. And again switch see 8100, because frame is double tagged. What next step? Will switch check next Etyhertype field or simply assume, that this is non IP traffic, because second Ethertype is not IP (0080).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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