Label Distribution Protocol
460
MPLS Guide
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
3HE 18686 AAAB TQZZA
export-tunnel-table
Syntax export-tunnel-table policy-name [policy-name...(up to 5 max)]
no export-tunnel-table
Context config>router>ldp
Description This command enables exporting of SR tunnels from the TTM into LDP (IGP) for the purpose
of stitching an LDP FEC to an SR tunnel for the same destination IPv4 /32 IS-IS prefix.
The no form of the command disables the exporting of SR tunnels to LDP.
Default no export-tunnel-table
Parameters policy-name — the export-tunnel-table route policy name; must be an existing
policy-statement name
fast-reroute
Syntax fast-reroute [backup-sr-tunnel]
no fast-reroute
Context config>router>ldp
Description This command enables LDP Fast Reroute (FRR). LDP FRR provides local protection for an
LDP FEC by precalculating and downloading a primary and a backup NHLFE for the FEC to
the LDP FIB.
This command is limited to IPv4 /32 prefixes in both LDP and SR.
When LDP FRR is enabled and an LFA backup next hop exists for the FEC prefix in the RTM,
or for the longest prefix the FEC prefix matches to when the aggregate-prefix-match
command is enabled, LDP programs the data path with both a primary NHLFE and a backup
NHLFE for each next hop of the FEC.
The backup NHLFE is enabled for each affected FEC next hop when any of the following
events occurs:
• an LDP interface goes operationally down or is administratively shut down
• an LDP session to a peer goes down because the Hello timer or keepalive timer has
expired over an interface
• the TCP connection used by a link LDP session to a peer goes down
The tunnel-down-damp-time command, when enabled, does not cause the corresponding
timer to be activated for a FEC as long as a backup NHLFE is still available.
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