Label Distribution Protocol
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MPLS Guide
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5.12.2.1.2 LDP Global Commands
ldp
Syntax [no] ldp
Context config>router
Description This command enables the context to configure an LDP protocol instance.
When an LDP instance is created, the protocol is enabled (in the no shutdown state). To
suspend the LDP protocol, use the shutdown command. Configuration parameters are not
affected.
The no form of the command deletes the LDP protocol instance, removing all associated
configuration parameters. The LDP instance must first be disabled with the shutdown
command before being deleted.
Default n/a — LDP must be explicitly enabled
aggregate-prefix-match
Syntax [no] aggregate-prefix-match
Context config>router>ldp
Description This command enables LDP to use the aggregate prefix match function rather than requiring
an exact prefix match.
When this command is enabled and an LSR receives a FEC-label binding from an LDP
neighbor for a prefix-address FEC element, FEC1, it will install the binding in the LDP FIB if:
• the routing table (RIB) contains an entry that matches FEC1. Matching can either be a
longest IP match of the FEC prefix or an exact match.
• the advertising LDP neighbor is the next hop to reach FEC1
When the FEC-label binding has been installed in the LDP FIB, LDP programs an NHLFE
entry in the egress data path to forward packets to FEC1. LDP also advertises a new
FEC-label binding for FEC1 to all its LDP neighbors.
When a new prefix appears in the RIB, LDP checks the LDP FIB to determine if this prefix is
a closer match for any of the installed FEC elements. If a closer match is found, this may
mean that the LSR used as the next hop will change; if so, the NHLFE entry for that FEC must
be changed.
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