ar1 ---
sys
sysna ar1
int g0/0/0
ip add 10.0.15.1 24
int l0
ip add 1.1.1.1 32
ospf 1 rou 1.1.1.1
a 0
netw 10.0.15.1 0.0.0.0
netw 1.1.1.1 0.0.0.0

ar2 ---
sys
sysna ar2
int l0
ip add 2.2.2.2 32
int g0/0/0
ip add 10.0.15.2 24
int g0/0/1
ip add 10.0.25.1 24
ospf 1 rou 2.2.2.2
a 0
netw 10.0.15.2 0.0.0.0
netw 10.0.25.1 0.0.0.0
netw 2.2.2.2 0.0.0.0


ar3 --- 
sys
sysname ar3
int l0
ip add 3.3.3.3 32
int g0/0/0
ip add 10.0.25.2 24
ospf 1 rou 3.3.3.3
a 0
netw 10.0.25.2 0.0.0.0 
netw 3.3.3.3 0.0.0.0

在ar2上 
dis ospf peer brief