NBMA网络OSPF路由协议配置

R1：

interface Serial1/0/0
link-protocol fr
undo fr inarp//禁止反向arp地址学习
fr map ip 10.10.123.2 102 broadcast
fr map ip 10.10.123.3 103 broadcast
ip address 10.10.123.1 255.255.255.0

interface LoopBack0
ip address 10.10.1.1 255.255.255.255

ospf 1
peer 10.10.123.2 //宣告对端接口地址
peer 10.10.123.3
area 0.0.0.0
network 10.10.1.1 0.0.0.0
network 10.10.123.0 0.0.0.255
R2

interface Serial1/0/0
link-protocol fr
undo fr inarp
fr map ip 10.10.123.1 201 broadcast
fr map ip 10.10.123.3 201 broadcast
ip address 10.10.123.2 255.255.255.0
ospf dr-priority 0 //手工配置接口OSPF优先级，确定指定路由器为DR

interface LoopBack0
ip address 10.10.2.2 255.255.255.255

ospf 1
peer 10.10.123.1
area 0.0.0.0
network 10.10.2.2 0.0.0.0
network 10.10.123.0 0.0.0.255
R3:

interface Serial1/0/0
link-protocol fr
undo fr inarp
fr map ip 10.10.123.1 301 broadcast
fr map ip 10.10.123.2 301 broadcast
ip address 10.10.123.3 255.255.255.0
ospf dr-priority 0

interface LoopBack0
ip address 10.10.3.3 255.255.255.255

ospf 1
peer 10.10.123.1
area 0.0.0.0
network 10.10.3.3 0.0.0.0
network 10.10.123.0 0.0.0.255
验证：
查看OSPF信息
< R1>dis ospf peer

 OSPF Process 1 with Router ID 10.10.123.1Neighbors

Area 0.0.0.0 interface 10.10.123.1(Serial1/0/0)'s neighbors
Router ID: 10.10.2.2 Address: 10.10.123.2
State: Full Mode:Nbr is Slave Priority: 0
DR: 10.10.123.1 BDR: None MTU: 0
Dead timer due in 113 sec
Retrans timer interval: 5
Neighbor is up for 00:11:44
Authentication Sequence: [ 0 ]

Router ID: 10.10.3.3 Address: 10.10.123.3
State: Full Mode:Nbr is Slave Priority: 0
DR: 10.10.123.1 BDR: None MTU: 0
Dead timer due in 98 sec
Retrans timer interval: 8
Neighbor is up for 00:11:15
Authentication Sequence: [ 0 ]

查看OSPF路由表
< R1>dis ospf routing

 OSPF Process 1 with Router ID 10.10.123.1Routing Tables

Routing for Network
Destination Cost Type NextHop AdvRouter Area
10.10.1.1/32 0 Stub 10.10.1.1 10.10.123.1 0.0.0.0
10.10.123.0/24 48 Transit 10.10.123.1 10.10.123.1 0.0.0.0
10.10.2.2/32 48 Stub 10.10.123.2 10.10.2.2 0.0.0.0
10.10.3.3/32 48 Stub 10.10.123.3 10.10.3.3 0.0.0.0

Total Nets: 4
Intra Area: 4 Inter Area: 0 ASE: 0 NSSA: 0

查看路由表
< R1>dis ip routing-table
Route Flags: R - relay, D - download to fib

Routing Tables: Public
Destinations : 12 Routes : 12

Destination/Mask Proto Pre Cost Flags NextHop Interface

  10.10.1.1/32  Direct  0    0           D   127.0.0.1       LoopBack010.10.2.2/32  OSPF    10   48          D   10.10.123.2     Serial1/0/010.10.3.3/32  OSPF    10   48          D   10.10.123.3     Serial1/0/0
10.10.123.0/24  Direct  0    0           D   10.10.123.1     Serial1/0/0
10.10.123.1/32  Direct  0    0           D   127.0.0.1       Serial1/0/0
10.10.123.2/32  Direct  0    0           D   10.10.123.2     Serial1/0/0
10.10.123.3/32  Direct  0    0           D   10.10.123.3     Serial1/0/0

10.10.123.255/32 Direct 0 0 D 127.0.0.1 Serial1/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0

注意：NBMA网络中指定DR后其它非DR路由器优先级降为0；
NBMA网络中运行OSPF协议时要执行PEER命令宣告对端接口地址。