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ISL vs 802.1Q which Trunk protocol to ch

By ggreynolds ·
I was wondering if anyone could enlighten me on the diffrences between 802.1Q and Cisco's ISL. I have done a bit of research, but couldn't find any direct comparisions. Any help would be helpful, keep in mind I am working in a all Cisco shop for switches and routers.

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ISL vs 802.1Q which Trunk protocol to ch

by danlav65 In reply to ISL vs 802.1Q which Trunk ...

ISL is basically Cisco's version of the 802.1q standard. Cisco add's an extra frame (the ISL frame) to the packet. Since you are in an all Cisco shop you don't have to worry about your other equipment being able to handle ISL but this would be a consideration if you weren't. Normally the equipment would handle 802.1q. There are not many NIC's that handle ISL (Intel is the only one that comes to mind) but there are a few that handle 802.1q.
Hope this answers your question.

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ISL vs 802.1Q which Trunk protocol to ch

by ggreynolds In reply to ISL vs 802.1Q which Trunk ...
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