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The no form of this command disables LDP FRR.
Default
no fast-reroute
export-tunnel-table
Syntax
[no] export-tunnel-table policy-name
Context
config>router>ldp
Description
This command applies a tunnel table export policy to LDP for the purpose of learning BGP labeled
routes from the CPM tunnel table and stitching them to LDP FEC for the same prefix.
The user enables the stitching of routes between LDP and BGP by configuring separately tunnel table
route export policies in both protocols and enabling the advertising of RFC 3107, Carrying Label
Information in BGP-4, formatted labeled routes for prefixes learned from LDP FECs.
The route export policy in BGP instructs BGP to listen to LDP route entries in the CPM Tunnel Table.
If a /32 LDP FEC prefix matches an entry in the export policy, BGP originates a BGP labeled route,
stitches it to the LDP FEC, and re-distributes the BGP labeled route to its iBGP neighbors.
The user adds LDP FEC prefixes with the statement 'from protocol ldp' in the configuration of the
existing BGP export policy at the global level, the peer-group level, or at the peer level using the
commands:
To indicate to BGP to evaluate the entries with the 'from protocol ldp' statement in the export policy
when applied to a specific BGP neighbor, a new argument is added to the existing advertise-label
command:
configure>router>bgp>group>neighbour>advertise-label ipv4 include-ldp-prefix
Without the new include-ldp-prefix argument, only core IPv4 routes learned from RTM are
advertised as BGP labeled routes to the neighbor. No stitching of LDP FEC to the BGP labeled route
will be performed for this neighbor even if the same prefix was learned from LDP.
The tunnel table route export policy in LDP instructs LDP to listen to BGP route entries in the CPM
Tunnel Table. If a /32 BGP labeled route matches a prefix entry in the export policy, LDP originates
an LDP FEC for the prefix, stitches it to the BGP labeled route, and re-distributes the LDP FEC to its
iBGP neighbors.
The user can add BGP labeled route prefixes with the statement 'from protocol bgp' in the
configuration of the LDP tunnel table export policy. Note that the 'from protocol' statement has an
effect only when the protocol value is ldp. Policy entries with protocol values of rsvp, bgp, or any
value other than ldp are ignored at the time the policy is applied to LDP.
The no form of the command removes the policy from the configuration.
Default
no export-tunnel-table — no tunnel table export route policy is specified.
Parameters
policy-name — The export-tunnel-table route policy name. Allowed values are any string up to 32
7950 SR OS MPLS Configuration Guide
• configure>router>bgp>export policy-name
• configure>router>bgp>group>export policy-name
• configure>router>bgp>group>neighbour>export policy-name
characters long composed of printable, 7-bit ASCII characters excluding double quotes. If the
LDP Configuration Commands
Page 403
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