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i may have missed it, but one of my fave features of is-is is that it is a link-local non-ip protocol. hard to disrupt/attack remotely. This is overlooked far too often IMNSHO. As is the comparison of error/attack surface of "feature-rich" OSPF against "lean" IS-IS.

i just wish the is-is protocol folk had not suffered from so much ospf feature envy and garbaged it up in a futile attempt to penetrate the enterprise. randy