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[–] JunOS 0 points 1 points (+1|-0) ago  (edited ago)

I feel that this info is missed, even for some network pros. Here's a quick n' dirty for others.

100 Full-

Im set to 100 Full, you're set to 100 Full. We negotiate @ 100 Full.

Im set to 100 Full, you're set to Auto. We Negotiate @ 100 Half.

Im set to Auto, You're set to 100 Full. We Negotiate @ 100 Half.

Im set to Auto, You're set to Auto, We Negotiate @ 1Gig Full(or the highest speed avail on both cards)

10 Full-

Im set to 10 Full, you're set to 10 Full. We negotiate @ 10 Full.

Im set to 10 Full, you're set to Auto. We Negotiate @ 10 Half.

Im set to Auto, You're set to 10 Full. We Negotiate @ 10 Half.

Im set to Auto, You're set to Auto, We Negotiate @ 1Gig Full (or the highest speed avail on both cards)

So, 2 devices need to match, always.

10 vs. 100 vs. 1gig -

Im set to 100 Full, you're set to 10 Full. Link Down

Im set to 10 Full, you're set to 100 Full. Link Down

Im set to 1Gig Full, you're set to 10Full. Link Down (I could go on, but the speed needs to match, otherwise it's a down state)