3Com 4007, Implementation Manual, Page: 468 / 684

468 C
HAPTER
19: O
PEN
S
HORTEST
P
ATH
F
IRST
(OSPF) R
OUTING
Default Route
Metric
An OSPF router always forwards an IP packet to the network that is the
best match for the packet’s destination; best match means the longest or
most specific match. A router that fails to find a specific match for a
packet’s destination forwards the packet to the default router in the area.
To configure an OSPF router to advertise itself as the default router for an
area, you define a default route metric. By default, the default route
metric is not defined, which means that the router does not advertise
itself as the area’s default router.
When you remove the default route metric, the router no longer
advertises itself as the default router.
OSPF Interfaces
You configure OSPF router interfaces by adding OSPF characteristics to
existing IP VLAN interfaces. The OSPF interface has the following
characteristics and statistics, which are discussed in the next sections:
■
Mode
■
Priority
■
Area ID
■
Cost
■
Delay
■
Hello Interval
■
Retransmit Interval
■
Dead Interval
■
Password
■
Statistics
Mode The mode for an interface can be off or active . To run OSPF routing on
the interface, set the mode to
active
.