Label Distribution Protocol
464
MPLS Guide
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implicit-null-label
Syntax [no] implicit-null-label
Context config>router>ldp
Description This command enables the implicit null label option for all LDP FECs for which the router is
the eLER.
The implicit null label is signaled by the eLER to the previous-hop LSR during FEC signaling
by the LDP control protocol. When the implicit null label is signaled to the LSR, it pops the
outer label before sending the MPLS packet to the eLER; this is known as penultimate hop
popping.
The no form of the command disables the signaling of the implicit null label.
Default no implicit-null-label
import
Syntax import policy-name [policy-name …(up to 5 max)]
no import
Context config>router>ldp
Description This command specifies import route policies that determine which routes are accepted from
LDP neighbors. Policies are configured in the config>router>policy-options context. Refer
to the “Route Policies” section in the 7705 SAR Router Configuration Guide.
If no import policy is specified, LDP accepts all routes from configured LDP neighbors. Import
policies can be used to limit or modify the routes accepted and their corresponding
parameters and metrics.
If multiple policy names are specified, the policies are evaluated in the order they are
specified. The first policy that matches is applied. If multiple import commands are issued, the
last command entered will override the previous command. A maximum of five policy names
can be specified. The specified names must already be defined.
The no form of the command removes all policies from the configuration.
Default no import
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.
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