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What is the difference between ISL and 802.1Q as regards vlan identification?

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Question added by Micheal Egereugwu , IT TECHNICAL SUPPORT ENGINEER , AFRI-HUB ICT CENTER
Date Posted: 2017/07/12
Micheal Egereugwu
by Micheal Egereugwu , IT TECHNICAL SUPPORT ENGINEER , AFRI-HUB ICT CENTER

ISL Cisco proprietary. add 26 bytes header to frame. source vlan identified with a 15 bit vlan id field. also called double tagging. while

802.1q is an open standard. embeds its tagging information within layer 2 frame. referred to as single tagging. add 4 bytes tag field just after source mac address.

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