difference between native vlan in ISL & dot1q

[zesum]

what is difference native vlan between ISL and dot1q ?

In dot1q, two switch's trunk port must be same native v lan

but

In ISL, two switch's trunk port is not same native vlan

two sentence is true or false? why? plz..

thanks.

[Prashanth Krishnappa]

Unlike an ISL trunk, on a 802.1q trunk, one VLAN is NOT tagged. This VLAN, named the native VLAN, must be configured the same on each side of the trunk. This way, we can deduce to which VLAN a frame belongs when we

receive a frame with no tag. You can find more info on this at

http://www.cisco.com/warp/public/473/27.html#basic

http://www.cisco.com/warp/public/473/741_4.html