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New Member

How to verify COS setting on 802.1q header

have the following setup:

ESR10k===dot1Q.GE====CAT6K

there is an outgoing QoS policy on the ESR10K that does "set cos 5" on traffic that belongs to a certain qos-group..

how can i verify that this L2 cos value is set correctly via the CAT6K ? is there any show or debug commands on the CAT6K that will let me verify this value ?

BTW, i have tried to use SPAN and monitor incoming traffic on CAT6K by using a Sniffer Pro.. however, the captured packets does not include the vlan tag.

thanks,

arnel

1 REPLY
New Member

Re: How to verify COS setting on 802.1q header

to sniff the COS Field , you have to configure the Monitor Port as a trunk. It is a little bit tricky, you have to verify that the Monitor Port is really trunking.

Can´t remember exacly but on a native IOS 65XX you need something like "no trunk negotiate" on the monitor Port.

Without trunking the Switch forwards the pakets to the monitor port without the dot1q tag.

(testet with ethereal Analyzer)

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