Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - 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. 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 2. Then under the router OSPF level, specify the IP address of the neighbor in the OSPF 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 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 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 Interface Address 1.1.20.5 BDR: Router ID 2.2.2.1 Interface Address 1.1.20.4 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 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 1.1.100.1 255.255.255.0 696 BigIron RX Series Configuration Guide 53-1001810-01