MPLS Guide Label Distribution Protocol
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When a prefix is removed from the RIB, LDP checks the LDP FIB for all FEC elements that
matched this prefix to determine if another match exists in the routing table. If another match
exists, LDP must use it. This may mean that the LSR used as the next hop will change; if so,
the NHLFE entry for that FEC must be changed. If another match does not exist, the LSR
removes the FEC binding and sends a label withdraw message to its LDP neighbors.
If the next hop for a routing prefix changes, LDP updates the LDP FIB entry for the FEC
elements that matched this prefix. It also updates the NHLFE entry for the FEC elements.
The no form of this command disables the use of the aggregate prefix match function. LDP
then only performs an exact prefix match for FEC elements.
Default no aggregate-prefix-match
prefix-exclude
Syntax prefix-exclude policy-name [policy-name …(up to 5 max)]
no prefix-exclude
Context config>router>ldp>aggregate-prefix-match
Description This command specifies the policy name containing the prefixes to be excluded from the
aggregate prefix match function. Against each excluded prefix, LDP performs an exact match
of a specific FEC element prefix, rather than a longest prefix match of one or more LDP FEC
element prefixes, when it receives a FEC-label binding or when a change to the prefix occurs
in the routing table.
The no form of this command removes all policies from the configuration; therefore, no
prefixes are excluded.
Default no prefix-exclude
Parameters policy-name — specifies the import route policy name. Allowed values are any string up
to 32 characters long composed of printable, 7-bit ASCII characters. If the string
contains special characters (#, $, spaces, etc.), the entire string must be enclosed
within double quotes.
egress-statistics
Syntax egress-statistics
Context config>router>ldp
Description This command enters the context to enable egress data path statistics at the ingress LER for
this FEC.
Default n/a
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