3Com Router 3031, Справочник по командам

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OSPF Configuration Commands 593
View
OSPF view
Parameter
■
ip-address: IP address of the neighboring point.
■
dr-priority-number: Represents the corresponding value of the network
neighbor priority, being an integer ranging from 0 to 255. The default value is
1.
Description
Using the peer command, you can configure the IP address of adjacent routers
and specify a DR priority on an NBMA network. Using the undo peer command,
you can cancel the configuration.
On the frame relay network, a full-meshed network (i.e. there is a VC directly
connecting any two routers on the network) can be implemented by configuring
map. Thus OSPF can perform in the same way in the frame relay network as in the
broadcast network (such as electing DR and BDR). However, the IP address of
adjacent routers and their election rights must be configured manually for the
interface because adjacent routers cannot be found dynamically by advertising
Hello messages.
Example
Configure the IP address of peer router as 10.1.1.1.
[3Com-ospf-1] peer 10.1.1.1
preference Syntax
preference [ ase ] value
undo preference [ ase ]
View
OSPF view
Parameter
■
value: OSPF protocol route preference, ranging from 1 to 255.
■
ase: Preference of an imported external route of the AS.
Description
Using the preference command, you can configure the preference of an OSPF
protocol route. Using the undo preference command, you can restore the default
value of the OSPF protocol route.
By default, the preference of an OSPF protocol internal route is 10 and the
preference of an external route is 150.
Because multiple dynamic routing protocols could be running on a router, there is
the problem of routing information sharing among routing protocols and
selection. Therefore, a default preference is specified for each routing protocol.
When multiple routes to the same destination are found by different routing
protocols, the route found by high preference routing protocol will be selected to
forward IP packets.