Dave, what you wrote is correct for 802.1q trunks. However, ISL tags all frames, and 'native vlan' in ISL context is vlan to which the port will be assigned if trunking is disabled (by DISL, DTP, or via CLI). See: http://www.cisco.com/warp/public/793/lan_switching/2.html Regards, Sasa Dave wrote: > > Trunking is means of transporting multiple VLANs over a single link. This > is done by the tagging the frames according to which VLAN they belong to at > both ends of the trunk so they can be separated at the other end. If 10 > VLANs are being trunked, how many need to be tagged? Just nine, because > both ends agree that the untagged VLAN is the native VLAN. > > Since both ends believe that any untagged frames belong to the VLAN that is > configured as the native VLAN, you can see this could cause some serious > problems if different VLANs are configured as the native VLAN at each end of > the trunk. > > Native VLAN mismatches can also cause some really nasty bridging loops in a > large switched enviorment if you get multiple Spanning Tree negotiations > going at the same time. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=18569&t=18543 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
