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4 not so stubby area (nssa) – Siemens S223 User Manual

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UMN:CLI User Manual

SURPASS hiD 6615 S223/S323 R1.5

344 A50010-Y3-C150-2-7619

10.2.6.4

Not So Stubby Area (NSSA)

NSSA (Not So Stubby Area) is stub Area which can transmit the routing information to
Area by ASBR. On the other hand, Stub Area cannot transmit the routing information to
area. To configure NSSA, use the following command.

Command Mode

Description

area

<0-4294967295> nssa Router

Configures

NSSA.

The following options are configurable for NSSA:

default-information-originate

This option is configuration for allowing default path of Type-7 in NSSA. It means

routing path without routing information will use the interface which is allowed in de-

fault type-7 path. metric is for metric value, metric-type is for type of finding the path.

metric-type 1

uses internal path cost with external path cost as a cost, metric type 2

always uses external cost value only.

no-redistribution

This

option is configuration in NSSA for restriction to retransmit the routing informa-

tion which is from outside.

no-summary

This

option is for restriction to exchange routing information between OSPF areas.

translator-role

NSSA-LSA (Link State Advertisement) has three types according to the way of

process

type.

always

changes all NSSA-LSA into Type-5 LSA. candidate changes

NSSA-LSA into Type-5 LSA when it is translator. never does not change NSSA-LSA.

NSSA uses ASBR when it transmits Stub Area or other routing protocol Area into OSPF.
In this case, if other routing protocol has default path, use default-information-originate
command to configure the all of default path is using the assigned ASBR

To configure NSSA with various features, use command with options. area <0-
4294967295> NSSA command has 4 options as default-information-originate, no-
redistribution

, no-summary, translator-role and it can be selected more than 2 options

without order. default-information-originate has metric <0-16777214> and metric-type
<1-2> as an option, translator-role must choose one of candidate, never, always as an
options

.

The following is explaining options of command:

default-information-originate

or

default-information-originate metric

<0-16777214> or

default-information-originate metric-type

<1-2>

no-redistribution

no-summary

translator-role

{candidate | never | always}

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