26xx series jumbo frame support?

With the support of 802.1p Priority Tagging, the 2600 series switch would have to support at least 1522 byte frames (1518 for standard ethernet frame + 4 bytes for the frame tag).

Using two 3300 series switches with a 2600 series switch in between, I verified that the 2600 series will pass 802.1q tagged frames. The tags were not stripped and the frames were not dropped. I was not able to test a 1548 byte frame using ISL, but I would not suspect the switch to forward the frame.

However, none of our unmanaged gigabit switches support jumbo frames (9000 bytes). They are not able to dynamically allocate the buffers to support frames of this size. Only our 5200 and 6000 series switches are capable of supporting jumbo frames.