CCIE - mixing 100 and 1000 trunks

Author

mixing 100 and 1000 trunks

darthfeces

2003-03-08, 10:11 pm

i'd like to ask a switching question.
we have a switch fabric of
2 6500's in the core
mffc's on each
and gb and 100mb line cards.
we have 20 2820's 100mb trunk
20 cat5000's 100mb trunk
and we are integrating
some 3548's
and 82 3550's
at gb to the core.
are there any potential issues with mixing 100/mb and 1000/mb trunks in the network without pruning ?
i have been noticing that cat5000's see a lot of in-discards
when i looked it up it seemed to say that they are frames that could not be switched.
also on some100/mb trunks off a 3548 i see giants and input errors.
the gb trunks show no problems.
could the 100mb be "choke points" until we go all gb ?
thanks.

LANlord

2003-03-20, 12:57 pm

I have not heard of any problems with that scenario.

I would try aggregating your 100mb trunks to another 3550, and trunking the 3550 back to the core over a gb port. That will probably cut down on some errors. With the IOS on the 3550, it makes it easier (in my opinion) to control broadcasts, and other types of traffic on the interfaces...do some traffic engineering.

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