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Network OS Command Reference 39

53-1003115-01

area nssa (OSPF)

Creates a not-so-stubby area (NSSA) or modifies its parameters.

Synopsis area {A.B.C.D | decimal} nssa {metric [no-summary]| default-information-originate}

no area nssa

Operands A.B.C.D Area address in dotted decimal format.

decimal Area address In decimal format.

metric Additional cost for using a route to or from this area.

no-summary When configured on the NSSA area border router (ABR), this parameter

prevents any Type 3 and Type 4 summary link-state advertisement (LSA)

from being injected into the area. The only exception is that a default route

is injected into the NSSA by the ABR, and strictly as a Type 3 LSA (not a

Type 7, because that could cause intra-AS traffic to get routed out the AS).

This makes the NSSA an NSSA totally stubby area, which can only have

Type 1, 2 and 7 LSAs.

Note: This parameter is disabled by default, which means the default route

must use a Type 7 LSA.

default-information-originate

When configured on the ABR, this parameter injects a Type 7 default route

into the NSSA area. As a result, the other NSSA routers install the default

route through the advertising NSSA ABR. By default the NSSA ABR does not

originate a default route to the NSSA.

Defaults No areas are created.

Command Modes OSPF VRF router configuration mode

Description Use this command to create an NSSA area or modify its parameters. NSSAs are typically needed

when one-way transmission of Type-5 LSAs (out of the area) is desired but injection of the same

LSAs into the area is not acceptable.

Once created, the type of the area cannot be changed. The only exception to this rule is that an

NSSA or stub area can be changed to a totally NSSA or a totally stub area, respectively.

Usage Guidelines Enter no area nssa to delete an NSSA.

Examples To set an additional cost of 5 on an NSAA identified as 2 (in decimal format), and include the

no-summary parameter:

switch# configure

switch(config)# rbridge-id 5

switch(config-rbridge-id-5)#router ospf

switch(config-router-ospf-vrf-default-vrf)# area 2 nssa 5 no-summary

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