Hey Folks, I'm looking for information on various core network architectures that could harden a control plane or prevent/isolate the propagation of say a malformed packet/control plane issue. I know that a part of the problem can be solved with edge filtering, ebgp, defense in depth and MD5 auth, but I am looking for a solution that might involve multi-level IS-IS. Any pointers would be a help. Thanks Frank -- ========================= Frank P. Troy frank@troy-networks.com =========================