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Wireshark-users: Re: [Wireshark-users] Capturing VLAN tags with Wireshark

From: Steve Bertrand <steve@xxxxxxxxxx>
Date: Thu, 10 Jul 2008 10:51:17 -0400
Sheahan, John wrote:
Apparently, Cisco says port monitoring is available through the web
browswer but I've never tried it

The switch itself does port monitoring, however, on this switch, the monitor port must statically be configured as a specific VLAN access port.

This unfortunately monitors only a single VLAN, and has the effect of stripping out the VLAN information from the frame before egress to the Wireshark box.

Steve