Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 3 OSPF Configuration Commands
3Com Corporation
3-51
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
3.1.48 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 redistributed external route of the AS.
Description
Use the preference command to configure the preference of an OSPF protocol route.
Use the undo preference command to 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.
Example
# Specify the preference of an external redistributed route of the AS as 160.
[3Com -ospf-1] preference ase 160