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CatOS - capture dot1q header?

Can I configure a SPAN session on CatOS such that I can capture the dot1q headers? I am interested in the CoS markings and I have not yet been able to view the headers. I'm not sure if this is because the SPAN session isn't capturing them or the Network General Sniffer isn't displaying them. Any ideas?

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Re: CatOS - capture dot1q header?

Could you tell us what series you are using and its show tech output.

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