METHOD TO ACHIEVE THE USE OF AN EXTERNAL METRIC AS THE PRIMARY TIE-BREAKER IN INTERMEDIATE SYSTEM TO INTERMEDIATE SYSTEM (ISIS) ROUTE SELECTIONS

摘要

A method, apparatus and computer program product for providing the use of an external metric as the primary tie-breaker in ISIS route selections is presented. A set of routes are identified that are to be advertised by the router as external routes within a network. The routes are advertised by the router using a Type Length Variable (TLV), wherein the TLV contains metric information to be used as a first tiebreaker when selecting routes. The network is running an Intermediate System To Intermediate System (ISIS) protocol. The TLV includes a 32-bit or a 64-bit administrative tag sub-TLV, the TLV comprising TLV#135, TLV#235, TLV#236, and TLV#237.

主权项

1. A computer-implemented method in which a router performs operations comprising:
identifying a set of routes that are to be advertised by said router as external routes within a network; and advertising said routes by said router using a Type Length Variable (TLV), wherein said TLV contains metric information to be used as a first tiebreaker when selecting routes.