Alcatel-Lucent 7750 SR OS - Page 1103

Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1103
Description This command enables the use of split-horizon.
RIP uses split-horizon with poison-reverse to protect from such problems as “counting to infinity”.
Split-horizon with poison reverse means that routes learned from a neighbor through a given interface
are advertised in updates out of the same interface but with a metric of 16 (infinity).
The split-horizon disable command enables split horizon without poison reverse. This allows the
routes to be re-advertised on interfaces other than the interface that learned the route, with the
advertised metric equaling an increment of the metric-in value.
This configuration parameter can be set at three levels: global level (applies to all groups and
neighbor interfaces), group level (applies to all neighbor interfaces in the group) or neighbor level
(only applies to the specified neighbor interface). The most specific value is used. In particular if no
value is set (no split-horizon), the setting from the less specific level is inherited by the lower level.
The no form of the command disables split horizon command which allows the lower level to inherit
the setting from an upper level.
Default enabled
export
Syntax export policy [policy...]
no export
Context config>service>vprn>rip
config>service>vprn>rip>group
config>service>vprn>rip>group>neighbor
Description This command specifies the export policies to be used to control routes advertised to RIP neighbors.
By default, RIP advertises routes from other RIP routes but does not advertise any routes from other
protocols unless directed by an export policy.
The no form of the command removes all route policy names from the export list.
Default no export
Parameters policy — A route policy statement name.
import
Syntax import policy [policy...]
no import
Context config>service>vprn>rip
config>service>vprn>rip>group
config>service>vprn>rip>group>neighbor
Description This command specifies the import policies to be used to control routes advertised from RIP
neighbors. By default, RIP accepts all routes from configured RIP neighbors. Import policies can be
used to limit or modify the routes accepted and their corresponding parameters and metrics.
The no form of the command removes all route policy names from the import list.
Default no import