Area Nssa - Allied Telesis SwitchBlade x908 Series Software Reference Manual

OSPF Commands

area nssa

This command sets an area as a Not-So-Stubby-Area (NSSA). By default, no NSSA area is
defined.
Use this command to simplify administration if you are connecting a central site using OSPF to
a remote site that is using a different routing protocol. You can extend OSPF to cover the
remote connection by defining the area between the central router and the remote router as
an NSSA.
There are no external routes in an OSPF stub area, so you cannot redistribute from another
protocol into a stub area. A NSSA allows external routes to be flooded within the area. These
routes are then leaked into other areas. Although, the external routes from other areas still do
not enter the NSSA. You can either configure an area to be a stub area or an NSSA, not both.
The no form removes this designation.
Syntax
area <area-id> nssa [default-information-originate <metric> |
no area <area-id> nssa [default-information-originate |
Parameter
<area-id>
default-information-ori
ginate
<metric>
no-redistribution
no-summary
translator-role
<role>
Router mode
Mode
36.6
no-redistribution | no-summary | translator-role <role> ]
no-redistribution | no-summary | translator-role ]
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Description
The OSPF area that you are configuring as an NSSA. Use one
of the following formats: This can be entered in either dotted
decimal format or normal decimal format.
OSPF Area ID expressed in IPv4
<ip-address>
address format
OSPF Area ID expressed as a decimal
<0-4294967295>
number within the range shown
For example the values dotted decimal 0.0.1.2 and decimal
258 would both define the same area ID.
Originate Type-7 default LSA into NSSA.
The external or internal metric. Specify the following:
The metric value.
metric
<0-16777214>
External metric type.
metric-type
<1-2>
Do not redistribute external route into NSSA.
Do not inject inter-area route into NSSA.
Specify NSSA-ABR translator-role.
The role type. Specify one of the following keywords:
always Router always translate NSSA-LSA to
Type-5 LSA.
candidate Router may translate NSSA-LSA to
Type-5 LSA if it is elected.
Router never translate NSSA-LSA.
never
.
A.B.C.D
C613-50007-01 REV B