Patent ID: 8537817

Claim:
A method comprising: receiving a Link State Advertisement (LSA) from a first router in a network at a second router in the network, the LSA advertising an address of an interface of the first router; determining whether the LSA includes a transit-only identification that indicates the interface of the first router is a transit-only interface, wherein a transit-only interface is an interface that directly connects to only interfaces of one or more other routers to transmit data from router to router; if the LSA does not include a transit-only identification that indicates the interface of the first router is a transit-only interface, installing the advertised address of the interface of the first router in a Routing Information Base (RIB) of the second router; and if the LSA does include a transit-only identification that indicates the interface of the first router is a transit-only interface, declining to install the advertised address of the interface of the first router in the RIB of the second router.