BFD Version Support

The JunosE Software supports both BFD Version 0 and BFD Version 1. When establishing a BFD neighbor session, the E Series router attempts to establish version 0 or version 1 sessions based on the capability of the BFD neighbor. Table 15 indicates how the routers establish sessions based on BFD version support:

Table 15: Determining BFD Versions

  E Series Routers Running JunosE 7.2.x (and later)E Series Routers Running Software Versions Earlier than JunosE 7.2.x
 BFD Version Support

Version 0 and Version 1

Version 0 Only

E Series Routers Running JunosE 7.2.x (and later) and Other Routers

Version 0 and Version 1

Result = Version 1

Result = Version 0

E Series Routers Running Software Versions Earlier than JunosE 7.2.x and Other Routers

Version 0 Only

Result = Version 0

Result = Version 0

Other Routers

Version 1 Only

Result = Version 1

No session
(version mismatch)

Note: You cannot configure the JunosE Software to send BFD Version 0 or BFD Version 1 packets. The JunosE Software determines the BFD version through auto-negotiation.