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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 7 indicates how the routers establish sessions based on BFD version support:

Table 7: 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.

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