Avaya Configuring IP Services Bedienungsanleitung Seite 136

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Configuring IP Services
5-6 114065 Rev. A
Area Internal Routers
A router with interfaces to networks in one area only is considered to be an area
internal router. Internal routers flood each area with complete routing information
about changes that occur within the area. In Area 0.0.0.1, for example, R4, R5,
and R6 are internal routers.
Area Border Router
A router with an interface to the backbone network and interfaces to one or more
additional areas is considered to be a border router. Each border router connects
one or more areas to the backbone. In
Figure 5-1, R3, R8, and R11 are border
routers. Using the backbone, border routers ensure that ASEs and summaries of
routing information for all areas are distributed throughout the AS.
For further information and instructions, see “Configuring an Area Border
Router” on page 5-30.
Area Identifiers
Each area has a unique ID number. (ID 0.0.0.0 is always reserved for the OSPF
backbone.) The AS in
Figure 5-1 has three areas (0.0.0.1, 0.0.0.2, and 0.0.0.3) and
a backbone (0.0.0.0).
For information on associating an OSPF interface with an area ID, see
“Configuring an Area ID” on page 5-14.
Boundary Routers and AS External Routes
OSPF considers the following routes to be AS external (ASE) routes:
A route to a destination outside the AS
A static route
A default route
A route derived by RIP
A directly connected network not running OSPF
A router configured with BGP, RIP, or another protocol to receive information
about external routes and OSFP to inject this information into an OSPF AS is
considered to be an OSPF boundary router.
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