Configuring The Adjacent Point; Configuring Ospf To Redistribute Routes - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
By default, OSPF identifies network type by looking at link layer type. After you specify
a network type for the interface, the original network type is removed automatically.

4.2.7 Configuring the Adjacent Point

For an NBMA network, OSPF router cannot discover adjacent routers through
broadcasting Hello packets; you must manually assign an IP address to the adjacent
router and specify whether the adjacent router is eligible for election.
Perform the following configuration in OSPF view.
Table 4-7 Configure the adjacent point
Configure a peer for the NBMA interface
Remove the configured peer for the
NBMA interface
By default, the preference for the neighbor of NBMA interface is 1.
The preference levels set with the ospf dr-priority command and the peer command
are used in different purpose:
The preference levels set with the ospf dr-priority command are for real DR
election.
The preference levels set with the peer command indicate if the neighbors are
authorized to elect. The preference level 0 means the neighbor is not authorized
and no hello messages are sent to the neighbor. This is an effective way to reduce
hello packet number in electing DR and BDR. But if the local router is DR or BDR,
it will still send hello messages to its neighbor with preference level 0, to set up
adjacency relation.

4.2.8 Configuring OSPF to Redistribute Routes

I. Redistributing routes of other protocols
The dynamic routing protocols on the router can share the routing information. As far as
OSPF is concerned, the routes discovered by other routing protocols are always
processed as the external routes of AS. In the import-route commands, you can
specify the type of route cost, cost and tag to overwrite the default route receiving
parameters (refer to "Configure Parameters for OSPF to Redistribute External
Routes").
The OSPF uses the following four types of routes (sequencing in priority):
Intra-area route
Inter-area route
Operation
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4-13
Chapter 4 OSPF Configuration
Command
peer ip-address
dr-priority-number ]
undo peer ip-address
[ dr-priority