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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-10
Command Function
DES-7200 (config-if)# ip ospf
network non-broadcast
Specify the network type of the interface to be
the NBMA type.
DES-7200 (config-if)# exit
Exit to the global configuration mode.
DES-7200 (config)# router ospf 1
Enter the routing process configuration mode.
DES-7200(config-router)# neighbor
ip-address [priority number]
[poll-interval seconds]
Specify the neighbor, its priority and polling
interval of Hello messages.
In a non-broadcast network, if it cannot ensure that any two routers are in direct
connection, the better solution is to set the network type of the OSPF to the
point-to-multipoint non-broadcast network type.
Whether in a point-to-multipoint broadcast or non-broadcast network, all the
neighbors have the same cost, which is the value set by using the ip ospf cost
command. However, the bandwidths of the neighbors may be actually different,
so the costs should be different. Therefore, you can specify the necessary cost for
each neighbor by using the neighbor command. This only applies to the
interfaces of the point-to-multipoint type (broadcast or non-broadcast).
To configure the point-to-multipoint type for the interfaces in a non-broadcast
network, execute the following commands in the interface configuration mode:
Command Function
DES-7200 (config-if)# ip ospf
point-to-multipoint non-broadcast
Specify the network type of the interface
to be the point-to-multipoint
non-broadcast type.
DES-7200 (config-if)# exit
Exit to the global configuration mode.
DES-7200 (config)# router ospf 1
Enter the routing process configuration
mode.
DES-7200(config-router)# neighbor
ip-address [cost number]
Specify the neighbor and the cost to the
neighbor.
Pay attention to step 4. If you have not specified the cost for the neighbor, the
cost referenced by the ip ospf cost command in the interface configuration mode
will be used.
4.2.3.3 Configuring Broadcast Network Type
It is necessary to select the designated router (DR) and backup designated router
(BDR) for the broadcast type network of OSPF. The DR will notify the link status
of this network to outside. All routers keep the neighbor relationship one another
and only the adjacent relationship with the designated routers and backup
designated routers. That is to say, each router only switches the link status