Patent ID: 7929524

Claim:
A method comprising: receiving an advertisement from a first routing system in a network at another routing system in said network, said advertisement including an address of an interface of said first routing system and an indication that said interface of said first routing system is a transit-only interface of said first routing system, wherein a transit-only interface is an interface that directly connects to only interfaces of one or more other routing systems to transmit data between said first routing system and said other routing systems; reading said advertisement by said another routing system; determining that said advertisement includes said indication; and declining to store said address of said interface of said first routing system included in said advertisement in a Router Information Base (RIB) of said another routing system, in response to determination said advertisement includes said indication that said interface of said first routing system is a transit-only interface, wherein said advertisement is an Open Shortest Path First (OSPF) Link State Advertisement (LSA) and said indication in said advertisement that said interface of said first routing system is a transit-only interface is a particular valid network mask.