Alcatel-Lucent 7750 SR Manual page 1414

VPRN Service Configuration Commands
split-horizon
Syntax split-horizon {enable | disable}
no split-horizon
Context config>service>vprn>rip
config>service>vprn>rip>group
config>service>vprn>rip>group>neighbor
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.
Page 1414 7750 SR OS Services Guide