User's Manual
39JadeOSUserManual
transmit a link state update packet on an OSPF in-
terface.
Table 6-1 OSPF Interface Parameter
6.7.4 Configuring OSPF Area
JadeOS OSPF supports the following types of area:
z Stub area
Stub areas are areas in to which information on external routes is not sent. Instead,
there is a default external route generated by the area border router, into the stub area
for destinations outside the autonomous system. To take advantage of the OSPF stub
area support, default routing must be in the stub area, you can configure no-summary
on the ABR to prevent it from sending summary link advertisement into the stub area.
To configure a stub area on JadeOS, use the following command:
area <area-id> stub [no-summary]
For example, configure area 1.1.1.1 as stub area on JadeOS:
(JadeOS) (config) #router ospf
(JadeOS) (config-router) # area 2 stub no-summary
z NSSA(Not So Stubby Area) area
NSSA area is similar to OSPF stub area. NSSA does not flood Type 5 (External Link
State Advertisements)LSA form the core into the area, but it has the ability of import-
ing AS external routes in a limited fashion within the area. NSSA allows importing of
Type 7 AS external routes within NSSA area by redistribution. These Type 7 LSAs are
translated into Type 5 LSAs by NSSA ABR which are flooded throughout the whole
routing domain.
To configure a NSSA area on JadeOS, use the following command:
area <area-id> nssa [ no-redistribution ] [no-summary ] [default-information-originate]
Example 1, configure area 1.1.1.1 as totally NSSA area on JadeOS:
(JadeOS)(config)# router ospf
(JadeOS) (config-router) # area 1 nssa no-summary
Example 2, configure area 1.1.1.1 as non-totally NSSA area, not importing type-7 ex-
ternal routes to the area:
(JadeOS)(config)# router ospf area 1.1.1.1
(JadeOS)(config-router) # nssa no-redistribution
Example 3, configure area 1.1.1.1as non-totally NSSA area, importing a default route
to the area:
(JadeOS)(config)# router ospf
(JadeOS)(config-router) # area 1 nssa default-information-originate