المشاركة الأصلية كتبت بواسطة KiDmAn
on Catalyst 2950 series the only encapsulation type is 802.1q.
on catalyst 1900 series the only encapsulation type is ISL.
so on both series you can't specified which type of encapsulation you want.
but as an example on Catalyst 3550 series "the 3550 can run both ISL and the IEEE 802.1Q trunking
encapsulation method—the 2950 can only run 802.1Q" from SYBEX 5th edition
so if you connect a 3550 with either 1900 or 2950 you shouldn't do any configuration on the trunk.
and cause ISL is a cisco proprietary SYBEX 5th edition said "IEEE 802.1Q
Created by the IEEE as a standard method of frame tagging, it actually inserts
a field into the frame to identify the VLAN. If you’re trunking between a Cisco switched link
and a different brand of switch, you have to use 802.1Q for the trunk to work"
I hope that my idea is clear.