Patent ID: 9270574
Filing Date: 2016-02-23
CPC Classification: H04L

Claim Text:
1. A computer-implemented method in which a computer system performs operations comprising: sending, by a first network device to at least one of a plurality of other network devices in a network, link state information directing receivers of said link state information, when computing routes transiting though said first network device, to refrain from using said first network device on at least one of the group consisting of per Network Layer Protocol Identifier (NLPID), per address family, and per service within an address family; wherein said link state information comprises a Type Length Value (TLV) that is flooded to all devices in said network; wherein calculation of routes through said first network device are delayed as long as said TLV value indicates that routes should not be calculated through said first network device; and wherein said TLV indicates to other network devices not to use said first network device for Layer 2 (L2) routing but said first network device can be used for L3 routing.