LDP Authentication MD5

This feature introduces support for an MD5 signature for an LDP TCP connection to protect against the introduction of spoofed TCP segments into LDP session connection streams. A router using the MD5 signature option is configured with a password for each peer for which authentication is required. The password is stored encrypted. LDP hello adjacencies can be created even when peering interfaces are configured with different security signatures. However, the LDP TCP session cannot be authenticated and is never established.