Alcatel-Lucent 7750 SR Manual page 1400

VPRN Service Configuration Commands
redistribute-external
Syntax [no] redistribute-external
Context config>service>vprn>ospf>area>nssa
config>service>vprn>ospf3>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
config>service>vprn>ospf3>area>nssa
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.
stub
Syntax [no] stub
Context config>service>vprn>ospf>area
config>service>vprn>ospf3>area
Description
This command enables access to the context to configure an OSPF stub area and adds/removes the
stub designation from the area. External routing information is not flooded into stub areas. All routers
in the stub area must be configured with the stub command. An OSPF area cannot be both an NSSA
and a stub area. Existing virtual links of a non STUB or NSSA area will be removed when its
designation is changed to NSSA or STUB.
By default, an area is not a stub area.
Page 1400 7750 SR OS Services Guide