I know that Native VLAN concept in used only in 802.1Q Trunk and not in ISL.
Then how cisco handles the packets without tagging, For instance PC connected to IP Phone.
In which VLAN it puts this PC.?
shall anybody throw light on this concept.
Hello R.B. Kumar,
ISL is Cisco proprietary so it cannot be used by a PC.
However, I suppose that untagged ethernet frames shouldn't be accepted on an ISL trunk port it should accept only ISL frames (each of them carry an ethernet frame inside)
The only note is that ISL in its bigger overhead has space for connections via an hub it is necessary that the link has to be point-to-point.
So if you connect a PC to a port configured to be an ISL trunk the PC NIC should be isolated from the network.
Hope to help