But lets understand its differences with 802.1Q. Personally, I don't use ISL and you shouldn't either. Trunk ports can be configured in two ways, the Cisco proprietary Inter-Switch Link, ISL, or with the standard IEEE 802.1Q. A trunk will allow multiple VLANs to transport between switches.These ports must be access mode.(We want to connect these ports to users-customers) And 2 ports in trunk mode to communicate other switches. We have 10 Alcatel Omniswitch 6250 and we need to create one vlan for one switch port.(to separate all ports).VLAN 10) and use that as the native VLAN on trunk ports (but not on any access ports).
A best practice is to change this to something other than VLAN 1 (e.g. You should be using a VLAN interface for management access.
