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.