Dell PowerConnect B-RX Configuration Manual page 768

25
Configuring OSPF
You configure NBMAs on an interface. The routers at the other end of that interface must have a
non-broadcast neighbor configured. There is no restriction on the number of routers sharing a
non-broadcast interface (for example, through a hub or switch).
To configure NBMA on an interface, do the following.
1. Create an OSPF area on an interface, then enable NBMA on that interface.
2. Then under the router OSPF level, specify the IP address of the neighbor in the OSPF
For example, to configure the feature in a network with three routers connected by a hub or switch,
each router must have the linking interface configured as a non-broadcast interface, and both of
the other routers must be specified as neighbors.
The output of the show ip ospf interface command has been enhanced to display information
about non-broadcast interfaces and neighbors that are configured in the same sub-net.
For example.
BigIron RX# show ip ospf interface
v20,OSPF enabled
In the Type field, "non-broadcast" indicates that this is a non-broadcast interface. When the
interface type is non-broadcast, the Non-broadcast neighbor config field displays the neighbors
that are configured in the same sub-net. If no neighbors are configured in the same sub-net, a
message such as the following is displayed.
***Warning! no non-broadcast neighbor config in 1.1.100.1 255.255.255.0
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BigIron RX(config)# int ve 20
BigIron RX(config-vif-20)# ip ospf area 0
BigIron RX(config-vif-20)# ip ospf network non-broadcast
BigIron RX(config-vif-20)# exit
Syntax: [no] ip ospf network non-broadcast
configuration. The non-broadcast interface configuration must be done on the OSPF routers on
both ends of the link.
For example, the following commands configure VE 20 as a non-broadcast interface.
The following commands specify 1.1.20.1 as an OSPF neighbor address. The address specified
must be in the same sub-net as a non-broadcast interface.
BigIron RX(config)# router ospf
BigIron RX(config-ospf-router)# neighbor 1.1.20.1
Syntax: neighbor <ip-address>
IP Address 1.1.20.4, Area 0
OSPF state BD, Pri 1, Cost 1, Options 2, Type nbma Events 6
Timers(sec): Transit 1, Retrans 5, Hello 10, Dead 40
DR: Router ID 1.1.13.1
BDR: Router ID 2.2.2.1
Neighbor Count = 1, Adjacent Neighbor Count= 2
Non-broadcast neighbor config: 1.1.20.1, 1.1.20.2, 1.1.20.3, 1.1.20.5,
Neighbor: 1.1.20.5
Authentication-Key:None
MD5 Authentication: Key None, Key-Id None, Auth-change-wait-time 300
Interface Address 1.1.20.5
Interface Address 1.1.20.4
BigIron RX Series Configuration Guide
53-1001810-01