On 7/24/13 6:15 PM, Marc, LX1DUC wrote:
(BTW IS-IS probably wouldn't work that well over Layer3 tunnels AFAIK, as it is itself a Layer3 protocol and would need to be transported over a Layer2 link (please correct me if I'm wrong))
IS-IS will work fine over GRE. GRE forms an interface over which IP/CLNS can function. Multicast and broadcast traffic works over this as well.