The MSDP peers must be configured with the same authentication password; otherwise, the TCP connection cannot be set up between MSDP peers and MSDP messages cannot be transmitted. The authentication password on peers can be in different forms, that is, the password on one end can be in the cipher text while the password on the peer can be in the plain text. By default, MSDP MD5 authentication is not configured for MSDP. Configuring MSDP MD5 authentication is recommended to ensure system security.
You must configure Key-Chain authentication on both MSDP peers. Encryption algorithms and passwords configured for Key-Chain authentication on both peers must be the same; otherwise, the TCP connection cannot be set up between MSDP peers and MSDP messages cannot be transmitted. By default, MSDP Key-Chain authentication is not configured for MSDP. Configuring MSDP Key-Chain authentication is recommended to ensure system security.