srue Fri, 04/06/2007 - 19:17

I can't say for sure. I'd want to see it in a lab. But, I'm guessing the two sides wouldn't even communicate due to incompatible encapsulation types. ie no trunk would be formed.

scottmac Fri, 04/06/2007 - 21:16

It might, depending on the size of the frame ISL is fed. ISL adds a tag to the front of the frame ... if the frame is already near max size, the additional tag could make it big enough to be a "giant" (dot1q could too, but it stuffs the tag inside instead of tacking it to the front)

Good Luck


srue Sat, 04/07/2007 - 08:09

The trunk won't even come up anyway due to mismatched encapsulations. I forgot I had this happen to me when trying to trunk an older switch to a 6500.

scottmac Sat, 04/07/2007 - 14:40

There will still be some traffic on the link (administrative & control), the the counters on the receiving side will still see the "giants" or "malformed" frames.



amanuddin80 Mon, 04/16/2007 - 03:02


Actually, by default, trunk mode is dynamic desireable, it will get any type of encapsulation or tagging.


This Discussion