Mode; Priority - 3Com CoreBuilder 2500 User Manual

Interface You configure OSPF router interfaces by adding OSPF characteristics to
Characteristics existing IP Virtual LAN (VLAN) interfaces. See Chapter 9, "Administering
VLANs," for information about how to configure VLAN interfaces.
The OSPF interface has the following characteristics and statistics, which
are discussed in the next sections:

Mode

The mode for an interface can be off or active. To run OSPF routing on
the interface, set the mode to active.
To set the OSPF interface mode to active, you must enable IP routing. See
Chapter 10 for information about enabling IP routing.
The default mode is off.
Default

Priority

You assign the interface priority to an OSPF router to determine its status
as a designated router. A router can function in one of three ways:
The default priority value is 1.
Default
Mode
Priority
Area ID
Cost
Delay
Hello Timer
Retransmit Timer
Dead Interval
Password
Designated router (DR) — The router with the highest priority value,
unless a designated router already exists on the network segment.
Backup designated router (BDR) — The router with a lower priority
than the DR; the BDR takes over DR functions if the DR fails.
Not a designated router — Any router given a priority 0 or not
elected DR or BDR. Priority 0 routers can never be elected as a DR or
a BDR.
Elements of OSPF Routing 7-9