Intra-domain source address validation fast reroute using igps

A method implemented by a network node in an interior gateway protocol (IGP) domain, comprising:

• receiving a first message from a second network node in the IGP domain, wherein the first message identifies a backup path to be used by the second network node upon detection of a failure in the IGP domain;
• updating a source address validation (SAV) table to include a backup port corresponding to the backup path;
• and
• receiving a second message from the second network node, wherein the second message notifies the network node to use the backup port in the SAV table on the second network node to validate packets received on the backup path.

A network node in an interior gateway protocol (IGP) domain, comprising:

• a memory configured to store instructions;
• and
• one or more processors coupled to the memory and configured to execute the instructions to cause the network node to:
• receive a first message from a second network node in the IGP domain, wherein the first message identifies a backup path to be used by the second network node upon detection of a failure in the IGP domain,
• update a source address validation (SAV) table to include a backup port corresponding to the backup path, and
• receive a second message from the second network node, wherein the second message notifies the network node to use the backup port in the SAV table on the second network node to validate packets received on the backup path.