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Chapter 9 - Routing Protocols 72
OSPF Global Configurations
STEP THREE
After completing the OSPF interface configuration for all interfaces (even those that will not use OSPF), navigate
to the OSPF Menu, CONFIG=>IP=>OSPF. Enter into the OSPF Global Commands menu and set the parameters
as indicated in the table below.
OSPF Global Commands Menu CONFIG =>IP =>OSPF =>GLOBAL
Parameter Description
OSPF Protocol Enables OSPF on all interfaces.
Router ID Assigns a unique ID to the router for use by the OSPF protocol. It must be one of the
router's IP addresses.
AS Boundary Router An Autonomous System Boundary Router (ASBR) can convert external routes into
OSPF routes. Which external routes is determined through the following parameters.
In the figure, only Router 5 is an ASBR.
The following parameters apply only to
Autonomous System Boundary Routers
.
Originate Default
Gateway
Advertisement
Router will advertise itself as the Default Gateway (DG).
Default Gateway
External Metric
Applies when
Originate Default Gateway Advertisement
is set to
Yes
. Defines the
metric that will be advertised by OSPF.
Default Gateway
External Metric-Type
Applies when
Originate Default Gateway Advertisement
is set to Yes. For
Type 1
, the
total metric of this route is composed of the internal metric (inside the autonomous
system) and the external metric (provided in the previous parameter). For
Type 2
, the
total metric of this route is the value provided in the previous parameter.
Advertise RIP Routes Routes learned through the RIP protocol will be converted to OSPF as external routes.
RIP External Metric Applies when
Advertise RIP routes
is set to
Yes
. Defines the metric that will be
advertised by OSPF.
this table continued