Extreme Networks ExtremeWare 7.3.0, Command Reference Manual

Page: 1311 / 2254

configure ospf vlan area
ExtremeWare Software 7.3.0 Command Reference Guide 1311
configure ospf vlan area
configure ospf [all | vlan <vlan name>] area <area identifier>
Description
Associates a VLAN (router interface) with an OSPF area. By default, all router interfaces are associated
with area 0.0.0.0.
Syntax Description
Default
Area 0.0.0.0
Usage Guidelines
Any OSPF network that contains more than one area is required to have an area configured as area 0,
also called the
backbone . All areas in an autonomous system must be connected to the backbone. When
designing networks, you should start with area 0, and then expand into other areas.
The backbone allows summary information to be exchanged between ABRs. Every ABR hears the area
summaries from all other ABRs. The ABR then forms a picture of the distance to all networks outside of
its area by examining the collected advertisements, and adding in the backbone distance to each
advertising router.
When a VLAN is configured to run OSPF, by default you must assign it to an area.
Example
The following command associates the VLAN accounting with an OSPF area:
configure ospf vlan accounting area 0.0.0.6
History
This command was available in ExtremeWare 2.0.
Platform Availability
This command is available on all platforms.
all Specifies all VLANs.
vlan name Specifies a VLAN name.
area identifier Specifies an OSPF area.