Riverbed SteelHead 3070-SD, User Manual

Page: 60 / 124

60 | Configuring BGP, OSPF, Static Routing, and Route Retraction on SteelHead SD
Configuring OSPF with ABR on SteelHead SD
3. Click Attach Interface .
Figure 7-12. Attaching an OSPF interface
4. Fill out these interface attributes:
• OSPF Area - Select the OSPF area associated with the interface from the drop-down list.
• Inherit Area Values - Click On to allow the interface to automatically inherit the area settings. When
enabled and this interface area is updated, this interface settings will change to match the
containing OSPF area.
Click Off to define unique settings for the area. This option locks the interface configuration so any
changes to the area do not overwrite the interface parameters. For details on these unique settings,
see
Step 5 on page 57 .
5. Click Submit .
After you attach the interface to the OSPF area, the gateway configures the zone or zones to run OSPF
and establishes OSPF neighbors with LAN routers in the same network segment.
Creating OSPF areas
All of the networks learned from an OSPF zone interfaces are mapped to the OSPF area that the interface
is connected to. For details on dynamic routing with OSPF, we recommend you consult the
SteelConnect Manager User Guide .
A large OSPF domain is broken into separate areas to restrict the multiplication of routes and reduce the
resources required by each router to maintain its link state database. Each area is connected to a central
backbone, typically called area 0. OSPF uses different types of Link State Advertisements (LSAs) to
communicate link state information between neighbors.
SteelHead SD supports these LSA types:
• Standard - Routers in this area accept default and autonomous system boundary router (ASBR)
injected external routes. The backbone is considered a standard area.
• Stub - Routers in this area accept inter-area routes and the default route from their ABR. They do
not accept ASBR injected external routes. A stub type can contain type 1, 2, and 3 LSAs.