Enterasys C5G124-24

Basic OSPF Topology Configuration
Fixed Switch Configuration Guide 22-5
Router 1(su)->router(Config-if(Vlan 2))#no shutdown
Router 1(su)->router(Config-if(Vlan 2))#exit
Router 1(su)->router(Config)#interface loopback 0
Router 1(su)->router(Config-if(Lpbk 0))#ip address 10.10.10.10 255.255.255.255
Router 1(su)->router(Config-if(Lpbk 0))#no shutdown
Router 1(su)->router(Config-if(Lpbk 0))#exit
Router 1(su)->router(Config)#router id 10.10.10.10
Router 1(su)->router(Config)#router ospf 1
Router 1(su)->router(Config-router)#
Router 2 CLI Input
Router 2(su)->router(Config)#interface vlan 2
Router 2(su)->router(Config-if(Vlan 2))#ip address 172.10.2.2 255.255.255.0
Router 2(su)->router(Config-if(Vlan 2))#ip ospf areaid 0.0.0.1
Router 2(su)->router(Config-if(Vlan 2))#ip ospf enable
Router 2(su)->router(Config-if(Vlan 2))#no shutdown
Router 2(su)->router(Config-if(Vlan 2))#exit
Router 2(su)->router(Config)#interface vlan 3
Router 2(su)->router(Config-if(Vlan 3))#ip address 172.2.1.1 255.255.255.0
Router 2(su)->router(Config-if(Vlan 3))#ip ospf areaid 0.0.0.0
Router 2(su)->router(Config-if(Vlan 3))#ip ospf enable
Router 2(su)->router(Config-if(Vlan 3))#no shutdown
Router 2(su)->router(Config-if(Vlan 3))#exit
Router 2(su)->router(Config)#interface loopback 0
Router 2(su)->router(Config-if(Lpbk 0))#ip address 20.20.20.20 255.255.255.255
Router 2(su)->router(Config-if(Lpbk 0))#no shutdown
Router 2(su)->router(Config-if(Lpbk 0))#exit
Router 2(su)->router(Config)#router id 20.20.20.20
Router 2(su)->router(Config)#router ospf 1
Router 2(su)->router(Config-router)#
Configuring the Designated Router
In the process of implementing OSPF, a large number of multi-access links to routers across the
network may cause too many adjacencies to form. To avoid this problem, a Designated Router
(DR) is elected per multi-access network to build adjacencies to all other routers on that network.
A Backup Designated Router (BDR) is also elected in case the Designated Router (DR) fails, in
which case the BDR will become the DR.
Note: A DR is required only for multi-access networks. Point-to-Point links do not need a DR
because only a single adjacency is required.