> The IETF picked OSPF. Certain vendors pushed IS-IS onto large ISP > customers, during the mid-90s, in part to give themselves a proprietary > advantage (at the time only 1 or 2 vendors had a solid IS-IS > implementation). puhleeze! is-is worked at scale. ospf did not. heck, when most large isps were starting (late '80s and early '90s), ospf barely worked at all. and perhaps one should not accuse a company of a "proprietary" advantage for implementing a well-known standardized protocol. but it sure is cheering to see that old wars and old warriors are not dead. randy