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Configuring BFD for LDP LSPs

You can configure Bidirectional Forwarding Detection (BFD) for LDP LSPs. BFD can be turned on for all or a subset of LDP IPv4 FECs.

An error is logged whenever a BFD session for a path fails. The following shows how BFD for LDP LSP log messages might appear:

RPD_LDP_BFD_UP: LDP BFD session for FEC  10.255.16.14/32 is up
RPD_LDP_BFD_DOWN: LDP BFD session for FEC  10.255.16.14/32 is down

You can also configure BFD for RSVP LSPs, as described in Configuring BFD for RSVP LSPs.

To enable BFD for LDP LSPs, include the oam and bfd-liveness-detection statements. You can enable BFD for all LDP LSPs on the router or just for the LDP LSPs associated with a specific FEC.




oam {



bfd-liveness-detection {
ecmp;
minimum-interval milliseconds;
minimum-receive-interval milliseconds;
minimum-transmit-interval milliseconds;
multiplier detection-time-multiplier;
}


fec fec-address;
}

For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.

The oam statement includes the following option:

fec—Specify the FEC address.

The bfd-liveness-detection statement includes the following options:

ecmp—Causes LDP to establish BFD sessions for all ECMP paths configured for the specified FEC. If you configure the ecmp option, you must also configure the periodic-traceroute statement for the specified FEC. If you do not do so, the commit fails. You can configure the periodic-traceroute statement at the global hierarchy level ([edit protocols ldp oam]) while only configuring the ecmp option for a specific FEC ([edit protocols ldp oam fec address bfd-liveness-detection]).
minimum-interval—Specifies the minimum transmit and receive interval. If you configure the minimum-interval option, you do not need to configure the minimum-receive-interval option or the minimum-transmit-interval option.
minimum-receive-interval—Specifies the minimum receive interval. The range is from 1 through 255,000 milliseconds.
minimum-transmit-interval—Specifies the minimum transmit interval. The range is from 1 through 255,000 milliseconds.
multiplier—Specifies the detection time multiplier. The range is from 1 through 255.

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