Preference - 3Com 5500-EI PWR Reference Manual

Description
Use the peer command to specify a neighbor and its DR priority on an NBMA network.
Use the undo peer command to remove this configuration.
On an NBMA network, you can configure mappings to make the network fully meshed (any two routers
have a direct link in between), so OSPF can handle DR/BDR election as it does on a broadcast network.
However, since routers on the network cannot find neighbors via broadcasting hello packets, you need
to specify neighbors and neighbor DR priorities on the routers.
Related commands: ospf dr-priority.
Examples
# Specify a neighbor with IP address 10.1.1.1.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] ospf 1
[Sysname-ospf-1] peer 10.1.1.1

preference

Syntax
preference [ ase ] value
undo preference [ ase ]
View
OSPF view
Parameters
value: OSPF protocol preference, in the range of 1 to 255.
ase: Indicates the preference of a redistributed external route of the AS.
Description
Use the preference command to configure the preference of the OSPF protocol.
Use the undo preference command to restore the default.
By default, the preference of an internal OSPF route is 10 and that of an external OSPF 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 a route is identified by different protocols, the protocol with
the highest preference selected for forwarding IP packets.
Examples
# Specify the preference of an imported external route of the AS as 160.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] ospf 1
[Sysname-ospf-1] preference ase 160
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