搭建实验环境：
1）公司网络中运行了多种路由协议
2）配置重发布实现公司内部网络互通
3）总公司R1上重发布默认路由实现全网访问Internet
实现此案例需要按照如下步骤进行。
interface GigabitEthernet0/0/0
ip address 192.168.11.1 255.255.255.252
interface GigabitEthernet0/0/1
ip address 192.168.12.1 255.255.255.0
interface GigabitEthernet0/0/2
ip address 192.168.13.1 255.255.255.0
ospf 1 router-id 1.1.1.1
default-route-advertise always cost 200 type 1
area 0.0.0.0
network 192.168.12.0 0.0.0.255
area 0.0.0.1
network 192.168.13.0 0.0.0.255
ip route-static 0.0.0.0 0.0.0.0 192.168.11.2
interface GigabitEthernet0/0/0
ip address 192.168.2.254 255.255.255.0
interface GigabitEthernet0/0/1
ip address 192.168.12.2 255.255.255.0
interface GigabitEthernet0/0/2
ospf 1 router-id 2.2.2.2
import-route direct cost 50 type 2
area 0.0.0.0
network 192.168.12.0 0.0.0.255
interface GigabitEthernet0/0/0
ip address 192.168.34.3 255.255.255.0
interface GigabitEthernet0/0/1
interface GigabitEthernet0/0/2
ip address 192.168.13.3 255.255.255.0
ospf 1 router-id 3.3.3.3
import-route static cost 100 type 2
area 0.0.0.1
network 192.168.13.0 0.0.0.255
ip route-static 192.168.4.0 255.255.255.0 192.168.34.4
interface GigabitEthernet0/0/0
ip address 192.168.34.4 255.255.255.0
interface GigabitEthernet0/0/1
ip address 192.168.4.254 255.255.255.0
interface GigabitEthernet0/0/2
ip route-static 0.0.0.0 0.0.0.0 192.168.34.3
interface GigabitEthernet0/0/0
ip address 192.168.11.2 255.255.255.252
interface GigabitEthernet0/0/1
ip address 1.1.1.254 255.255.255.0
interface GigabitEthernet0/0/2
ip route-static 192.168.2.0 255.255.255.0 192.168.11.1
ip route-static 192.168.4.0 255.255.255.0 192.168.11.1
<AR1>dis ip ro
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 16 Routes : 16
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 Static 60 0 RD 192.168.11.2 GigabitEthernet
0/0/0
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
192.168.2.0/24 O_ASE 150 50 D 192.168.12.2 GigabitEthernet
0/0/1
192.168.4.0/24 O_ASE 150 100 D 192.168.13.3 GigabitEthernet
0/0/2
192.168.11.0/30 Direct 0 0 D 192.168.11.1 GigabitEthernet
0/0/0
192.168.11.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.11.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.12.0/24 Direct 0 0 D 192.168.12.1 GigabitEthernet
0/0/1
192.168.12.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.13.0/24 Direct 0 0 D 192.168.13.1 GigabitEthernet
0/0/2
192.168.13.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/2
192.168.13.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/2
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
<AR1>dis ospf ro
OSPF Process 1 with Router ID 1.1.1.1
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
192.168.12.0/24 1 Transit 192.168.12.1 1.1.1.1 0.0.0.0
192.168.13.0/24 1 Transit 192.168.13.1 1.1.1.1 0.0.0.1
Routing for ASEs
Destination Cost Type Tag NextHop AdvRouter
192.168.2.0/24 50 Type2 1 192.168.12.2 2.2.2.2
192.168.4.0/24 100 Type2 1 192.168.13.3 3.3.3.3
Total Nets: 4
Intra Area: 2 Inter Area: 0 ASE: 2 NSSA: 0
<AR2>dis ip ro
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 13 Routes : 13
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 O_ASE 150 201 D 192.168.12.1 GigabitEthernet
0/0/1
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
192.168.2.0/24 Direct 0 0 D 192.168.2.254 GigabitEthernet
0/0/0
192.168.2.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.2.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.4.0/24 O_ASE 150 100 D 192.168.12.1 GigabitEthernet
0/0/1
192.168.12.0/24 Direct 0 0 D 192.168.12.2 GigabitEthernet
0/0/1
192.168.12.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.12.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.13.0/24 OSPF 10 2 D 192.168.12.1 GigabitEthernet
0/0/1
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
<AR2>dis ospf ro
OSPF Process 1 with Router ID 2.2.2.2
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
192.168.12.0/24 1 Transit 192.168.12.2 2.2.2.2 0.0.0.0
192.168.13.0/24 2 Inter-area 192.168.12.1 1.1.1.1 0.0.0.0
Routing for ASEs
Destination Cost Type Tag NextHop AdvRouter
0.0.0.0/0 201 Type1 1 192.168.12.1 1.1.1.1
192.168.4.0/24 100 Type2 1 192.168.12.1 3.3.3.3
Total Nets: 4
Intra Area: 1 Inter Area: 1 ASE: 2 NSSA: 0
<AR3>dis ip ro
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 14 Routes : 14
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 O_ASE 150 201 D 192.168.13.1 GigabitEthernet
0/0/2
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
192.168.2.0/24 O_ASE 150 50 D 192.168.13.1 GigabitEthernet
0/0/2
192.168.4.0/24 Static 60 0 RD 192.168.34.4 GigabitEthernet
0/0/0
192.168.12.0/24 OSPF 10 2 D 192.168.13.1 GigabitEthernet
0/0/2
192.168.13.0/24 Direct 0 0 D 192.168.13.3 GigabitEthernet
0/0/2
192.168.13.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/2
192.168.13.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/2
192.168.34.0/24 Direct 0 0 D 192.168.34.3 GigabitEthernet
0/0/0
192.168.34.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.34.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
<AR3>dis ospf ro
OSPF Process 1 with Router ID 3.3.3.3
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
192.168.13.0/24 1 Transit 192.168.13.3 3.3.3.3 0.0.0.1
192.168.12.0/24 2 Inter-area 192.168.13.1 1.1.1.1 0.0.0.1
Routing for ASEs
Destination Cost Type Tag NextHop AdvRouter
0.0.0.0/0 201 Type1 1 192.168.13.1 1.1.1.1
192.168.2.0/24 50 Type2 1 192.168.13.1 2.2.2.2
Total Nets: 4
Intra Area: 1 Inter Area: 1 ASE: 2 NSSA: 0
<AR4>dis ip ro
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 11 Routes : 11
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 Static 60 0 RD 192.168.34.3 GigabitEthernet
0/0/0
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
192.168.4.0/24 Direct 0 0 D 192.168.4.254 GigabitEthernet
0/0/1
192.168.4.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.4.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.34.0/24 Direct 0 0 D 192.168.34.4 GigabitEthernet
0/0/0
192.168.34.4/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.34.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
<ISP>dis ip ro
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 12 Routes : 12
Destination/Mask Proto Pre Cost Flags NextHop Interface
1.1.1.0/24 Direct 0 0 D 1.1.1.254 GigabitEthernet
0/0/1
1.1.1.254/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
1.1.1.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
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
192.168.2.0/24 Static 60 0 RD 192.168.11.1 GigabitEthernet
0/0/0
192.168.4.0/24 Static 60 0 RD 192.168.11.1 GigabitEthernet
0/0/0
192.168.11.0/30 Direct 0 0 D 192.168.11.2 GigabitEthernet
0/0/0
192.168.11.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.11.3/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
PC2、PC4、Server1可以互相ping通。
