I don't think that's what Dan is asking for, routing information can pass through layer 2 switches too. I would really like to hear some solution but i don't think its possible to do what Dan is asking for.
I agree with Rick in that i would have thought you could apply a VACL per interface.
Interestingly enough another approach could be to block unknown broadcast and multicast traffic on the switch ports. As IGP's generally send out routing updates with either multicast or broadcast this could effectively stop routing updates being sent out. Of course it could also break any number of other things so it would need careful testing.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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