Configuring IPv4 OSPFv2 Areas in Gaia Clish

Important - In a Cluster Two or more Security Gateways that work together in a redundant configuration - High Availability, or Load Sharing., you must configure all the Cluster Members in the same way.

For description of OSPFv2 Areas, see IPv4 OSPF Types of Areas.

The configuration is applicable to OSPF Multiple Instances (see Configuring IPv4 OSPFv2 Multiple Instances).

Syntax

set ospf [instance {<1-65535> | default}] area <OSPF Area ID>

nssa

default-cost {<1-16777215> | default}

default-metric-type {1 | 2}

import-summary-routes {off | on}

{off | on}

range <IPv4 Address>/<Mask Length>

{off | on}

restrict {off | on}

redistribution {off | on}

translator-role {always | candidate}

translator-stability-interval {<1-65535> | default}

{off | on}

range <IPv4 Address>/<Mask Length>

{off | on}

restrict {off | on}

stub

default-cost {<1-16777215> | default}

{off | on}

summary {off | on}

stub-network <IPv4 Address>/<Mask Length>

{off | on}

stub-network-cost {<1-65535> | default}

Parameters

Parameter

Description

set ospf [instance {<1-65535> | default}] area <OSPF Area ID>

Specifies an OSPF Area ID (for this OSPF Instance).

>	Best Practice - Enter the area ID as a dotted quad. The area ID 0.0.0.0 is reserved for the backbone.

Range:

backbone

By default, the backbone area is enabled.

You can disable the backbone area if the system does not have interfaces on the backbone area.
integer between 1 and 4294967295
dotted quad form (example: 0.0.0.1 for area id 1)

Default: none

set ospf [instance {<1-65535> | default}] area <OSPF Area ID> nssa

Configures this area as a Not-So-Stubby Area.

A Not-So-Stubby Area is an OSPF Stub Area, which can carry routes learned by other protocols such as BGP or RIP.

Note - The backbone area cannot be an NSSA area.

nssa default-cost {<1-16777215> | default}

Configures the routing cost associated with the default route for this area.

The higher the cost, the less preferred the route.

Range: 1-16777215, or default

Default: 1

nssa default-metric-type {1 | 2}

Configures the default route type for the Not-So-Stubby Area (NSSA).

A type 1 route is internal and its metric can be used directly by OSPF for comparison.
A type 2 route is external and is assumed to have a greater cost than any internal route.

Range: 1, or 2

Default: 1

nssa import-summary-routes {off | on}

Disables (off) or enables (on) the import of routes from Summary LSAs (Type 3 LSAs) into this area.

OSPF routers send packets called Link State Advertisements (LSAs) to all adjacent routers in an area.

Areas are smaller groups within the Autonomous System that can be defined in order to limit the flooding of LSAs.

Many LSA types do not leave the area from which they originated.

This increases efficiency and saves network bandwidth.

Type 3 LSAs are originated by Area Border Routers (ABRs) and are flooded to adjacent routers in a given area.

Each Type 3 LSA describes a route to a network which is external to the area but is internal to the local Autonomous System.

Range: off, or on

Default: on

nssa {off | on}

Removes (off) or configures (on) the Not-So-Stubby option for this area.

Range: off, or on

Default: none

nssa range <IPv4 Address>/<Mask Length> {off | on | restrict {off | on}}

Removes (off), adds (on), or restricts (restrict) the OSPF address range in this area.

off - Removes the given address range from the list of ranges to be advertised into the backbone area.
on - Configures the given address range to be advertised into the backbone area.
restrict - Blocks (off) or allows (on) the given address range from being advertised into the backbone area.

An IPv4 address range is defined by a prefix and a mask length in CIDR notation format (for example, 192.168.1.0/24).

An area can be configured with any number of address ranges.

These ranges are used to reduce the number of routing entries that an area will emit into the backbone area (and hence all areas).

If a given prefix aggregates a number of more specific prefixes within an area, then an address range can be configured and will be the only prefix advertised into the backbone.

Important - Pay attention when you configure an address range that includes addresses, which are not contained within the area. If a range is marked as restricted, then no advertisement is injected into the backbone.

Range: off, on, or restrict

Default: none

nssa redistribution {off | on}

Controls if both Type 5 LSAs and Type 7 LSAs (on), or only Type 5 LSAs (off) are originated by this router.

This is only relevant when the router is an NSSA Border Router.

Range: off, or on

Default: on

nssa translator-role {always | candidate}

Configures the translation of Type 7 LSAs into Type 5 LSAs.

Specifies whether or not this NSSA Border Router unconditionally translates Type 7 LSAs into Type 5 LSAs.

When configured as "always", this router translates LSAs regardless of the translator state of other NSSA routers.
When configured as "candidate", this router participates in the translator election to determine if it performs such duties.

If the NSSA router is not an Area Border Router, this option does not have any effect.

Range: always, or candidate

Default: candidate

nssa translator-stability-interval {<1-65535> | default}

Configures the Translator Stability Interval.

This time controls how long this Type 7 LSA translator continues to perform its translator duties once it determined that it is no longer the elected translator.

Range: 1-655335 seconds, or default

Default: 40 seconds

set ospf [instance {<1-65535> | default}] area <OSPF Area> {off | on}

Removes (off) or creates (on) the area and all related configuration.

set ospf [instance {<1-65535> | default}] area <OSPF Area> range <IPv4 Address>/<Mask Length>

Configures an OSPF address range for this area.

An IPv4 address range is defined by a prefix and a mask length in CIDR notation format (for example, 192.168.1.0/24).

An area can be configured with any number of address ranges.

These ranges are used to reduce the number of routing entries that an area will emit into the backbone area (and hence all areas).

If a given prefix aggregates a number of more specific prefixes within an area, then an address range can be configured and will be the only prefix advertised into the backbone.

range <IPv4 Address>/<Mask Length> {off | on | restrict {off | on}}

Removes (off), adds (on), or restricts (restrict) the OSPF address range in this area.

off - Removes the given address range from the list of ranges to be advertised into the backbone area.
on - Configures the given address range to be advertised into the backbone area.
restrict - Blocks (off) or allows (on) the given address range from being advertised into the backbone area.

Range: off, on, or restrict

Default: none

set ospf [instance {<1-65535> | default}] area <OSPF Area> stub

Configures this area as a Stub Area.

Stub areas do not allow Type 5 LSAs to be propagated into or throughout the area and instead depend on default routing for external destinations.

You can configure an area as a Stub Area to reduce the number of entries in the routing table.

Routes external to the OSPF domain are not added to the routing table.

Note - The backbone area cannot be a stub area.

stub default-cost {<1-16777215> | default}

Configures the routing cost associated with the default route for this area.

The higher the cost, the less preferred the route.

Range: 1-16777215, or default

Default: 1

stub {off | on}

Disables (off) or enables (on) this stub area:

off - Reconfigures the given area to not be a Stub Area.
on - Configures the given area to be a Stub Area.

Range: off, or on

Default: off

stub summary {off | on}

Disables (off) or enables (on) reception of summary LSAs into the area.

A Totally-Stubby Area does not have Type 4 or Type 5 LSAs.

It has only a single Type 3 LSA, which describes a default route.

When this option is disabled, the area is Totally-Stubby.
When this option is enabled, the area is Not Totally-Stubby.

Range: off, or on

Default: on

set ospf [instance {<1-65535> | default}] area <OSPF Area> stub-network <IPv4 Address>/<Mask Length>

Configures a Stub Network for this area.

A network address is defined by a prefix and a mask length in CIDR notation format (for example, 192.168.1.0/24).

OSPF can advertise routes of networks, which are not running OSPF by using a stub network.

The advertised routes appear as OSPF internal routes, and can be filtered for export at area borders using OSPF area ranges.

Any advertised network prefix must be directly connected to the router, where the stub network is configured.

Meaning, one of the router's interface addresses must be within the network to be included in the router LSA.

For OSPFv2, IPv4 Stub hosts may be configured by using a mask length of 32.

For OSPFv3, IPv6 Stub hosts may be configured by using a mask length of 128.

This feature also supports advertising a network that can be activated by the local address of a point-to-point interface. To advertise reachability to such an network, you must configure an IP address for the network along with a non-zero cost.

stub-network <IPv4 Address>/<Mask Length> {off | on}

Controls the stub network for this area:

off - Removes the given stub network from the given area.
on - Adds the given stub network to the given area.

Range: off, or on

Default: none

stub-network <IPv4 Address>/<Mask Length> stub-network-cost {<1-65535> | default}

Configures the cost associated with the stub network as reached through this router.

The higher the cost, the less preferred the route.

Range: 1-65535, or default

Default: 1