Alcatel-Lucent 7210 SAS-X - Page 832

VPRN Service Configuration Commands
Page 832 7210 SAS-X OS Services Guide
When configuring an NSSA with no summaries, the ABR will inject a type 3 LSA default route into
the NSSA area. Some older implementations expect a type 7 LSA default route.
The no form of the command disables origination of a default route.
Default no originate-default-route — A default route is not originated.
Parameters type-7 — Specifies a type 7 LSA should be used for the default route.
Configure this parameter to inject a type-7 LSA default route instead the type 3 LSA into the
NSSA configured with no summaries.
To revert to a type 3 LSA, enter originate-default-route without the type-7 parameter.
Default Type 3 LSA for the default route.
redistribute-external
Syntax [no] redistribute-external
Context config>service>vprn>ospf>area>nssa
Description This command enables the redistribution of external routes into the Not So Stubby Area (NSSA) or an
NSSA area border router (ABR) that is exporting the routes into non-NSSA areas.
NSSA or Not So Stubby Areas are similar to stub areas in that no external routes are imported into the
area from other OSPF areas. The major difference between a stub area and an NSSA is that the NSSA
has the capability to flood external routes that it learns (providing it is an ASBR) throughout its area
and via an Area Border Router to the entire OSPF domain.
The no form of the command disables the default behavior to automatically redistribute external
routes into the NSSA area from the NSSA ABR.
Default redistribute-external — External routes are redistributed into the NSSA.
summaries
Syntax [no] summaries
Context config>service>vprn>ospf>area>nssa
config>service>vprn>ospf>area>stub
Description This command enables sending summary (type 3) advertisements into a stub area or Not So Stubby
Area (NSSA) on an Area Border Router (ABR). This parameter is particularly useful to reduce the
size of the routing and Link State Database (LSDB) tables within the stub or nssa area. By default,
summary route advertisements are sent into the stub area or NSSA.
The no form of the command disables sending summary route advertisements and, for stub areas,
only the default route is advertised by the ABR.
Default summaries — Summary routes are advertised by the ABR into the stub area or NSSA.