Assigning Interfaces To An Area; Configuring Virtual Links - Brocade Communications Systems ICX 6650 Configuration Manual

When you disable the summary LSAs, the change takes effect immediately. If you apply the option
to a previously configured area, the router flushes all of the summary LSAs it has generated (as an
ABR) from the area.
NOTE
This feature applies only when the Brocade device is configured as an Area Border Router (ABR) for
the area. To completely prevent summary LSAs from being sent to the area, disable the summary
LSAs on each OSPF router that is an ABR for the area.
For example, to disable summary LSAs for stub area 40 and specify an additional metric of 99,
enter the following command.
Brocade(config-ospf6-router)#area 40 stub 99 no-summary
Syntax: area number | ipv4-address stub metric [no-summary]
The number | ipv4-address parameter specifies the area number, which can be a number or in
IPv4 address format. If you specify a number, the number can be from 0–18.
The stub metric parameter specifies an additional cost for using a route to or from this area and
can be from 1–16777215. There is no default. Normal areas do not use the cost parameter.
The no-summary parameter applies only to stub areas and disables summary LSAs from being sent
into the area.

Assigning interfaces to an area

After you define OSPF V3 areas, you must assign router interfaces to the areas. All router interfaces
must be assigned to one of the defined areas on an OSPF router. When an interface is assigned to
an area, all corresponding subnets on that interface are automatically included in the assignment.
For example, to assign Ethernet interface 1/1/3 to area 192.168.0.0, enter the following
commands.
Brocade(config)#interface ethernet 1/1/3
Brocade(config-if-e10000-1/1/3)#ipv6 ospf area 192.168.0.0
Syntax: [no] ipv6 ospf area number | ipv4-address
The number | ipv4-address parameter specifies the area number, which can be a number or in
IPv4 address format. If you specify a number, the number can be from 0–18.
To remove the interface from the specified area, use the no form of this command.

Configuring virtual links

All ABRs must have either a direct or indirect link to an OSPF backbone area (0.0.0.0 or 0). If an
ABR does not have a physical link to a backbone area, you can configure a virtual link from the ABR
to another router within the same area that has a physical connection to the backbone area.
The path for a virtual link is through an area shared by the neighbor ABR (router with a physical
backbone connection) and the ABR requiring a logical connection to the backbone.
Two parameters must be defined for all virtual links—transit area ID and neighbor router:
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Brocade ICX 6650 Layer 3 Routing Configuration Guide
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The transit area ID represents the shared area of the two ABRs and serves as the connection
point between the two routers. This number should match the area ID value.
OSPF V3 configuration
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