Enabling BFD in only one side

Answered Question
Oct 13th, 2009

Hi Everybody

The theory tells that if BFD stops to receive keepalives, it informs to the routing protocols that the neihgbor is down. If I configure BFD only in one side and associate BFD with the routing protocol, the neighborship goes down?

Thanks

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Correct Answer by Laurent Aubert about 7 years 3 months ago

Hi,

You need BFD on both side but you could use echo mode on one side only.

I tested it with 12.2(33)SRC2, and configuring BFD on one side only doesn't bring down the IGP adj. The BFD session stays in AdminDown state.

HTH

Laurent.

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Correct Answer
Laurent Aubert Wed, 10/14/2009 - 18:35

Hi,

You need BFD on both side but you could use echo mode on one side only.

I tested it with 12.2(33)SRC2, and configuring BFD on one side only doesn't bring down the IGP adj. The BFD session stays in AdminDown state.

HTH

Laurent.

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