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一、路由器OSPF协议-路由汇总

注意：ospf仅支持手动汇总

1.仅在ABR（区域边界路由器）上 进行 OSPF协议路由汇总

计算过程如下： |  

128 64 32 16   8| 4 2 1
 0     0    0   0  0 | 0 0 1
 0     0    0   0  0 | 0 1 0
 0     0    0   0  0 | 1 1 1
                          |    

1      1    1   1  1 | 0 0 0           = 248

实验1：

[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]display this
[V200R003C00]
#
interface GigabitEthernet0/0/0ip address 192.168.12.1 255.255.255.0 
#
return[R1]ospf 1
[R1-ospf-1]area 1
[R1-ospf-1-area-0.0.0.1]network 192.168.12.1 0.0.0.0

[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]dis this
[V200R003C00]
#
interface GigabitEthernet0/0/0ip address 192.168.12.2 255.255.255.0 
#
return
[R2-GigabitEthernet0/0/0]q
[R2]int g0/0/1
[R2-GigabitEthernet0/0/1]dis this
[V200R003C00]
#
interface GigabitEthernet0/0/1ip address 192.168.23.2 255.255.255.0 
#
return[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 192.168.23.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]q
[R2-ospf-1]area 1
[R2-ospf-1-area-0.0.0.1]network 192.168.12.2 0.0.0.0

[R3]int g0/0/01
[R3-GigabitEthernet0/0/1]display this
[V200R003C00]
#
interface GigabitEthernet0/0/1ip address 192.168.23.3 255.255.255.0 
#
return
[R3]ospf 1
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 192.168.23.3 0.0.0.0
[R3-ospf-1-area-0.0.0.0]q[R3]int LoopBack 1
[R3-LoopBack1]ip add 192.168.1.1 24
[R3-LoopBack1]ospf network-type broadcast 
[R3-LoopBack1]q[R3]interface LoopBack 7
[R3-LoopBack7]ip address 192.168.7.1 24
[R3-LoopBack7]ospf network-type broadcast 
[R3-LoopBack7]q[R3]ospf 1
[R3-ospf-1]area 2
[R3-ospf-1-area-0.0.0.2]net	
[R3-ospf-1-area-0.0.0.2]network 192.168.1.0 0.0.0.255
[R3-ospf-1-area-0.0.0.2]network 192.168.7.0 0.0.0.255

检查

此时在R3进行OSPF的路由汇总

[R3]ospf 1
[R3-ospf-1]are 2
[R3-ospf-1-area-0.0.0.2]abr-summary 192.168.0.0 255.255.248.0 cost  8

检查

<R2>ping 192.168.7.1       

<R2>ping 192.168.1.1

2.