1、简介:
在一个大型的OSPF网络中,往往会有很多的路由条目,这无疑会给网络的管理带来不便,同时也影响路由器的效率,对于一些连续的子网,我们可以在区域边界路由器(ABR)上将他们汇总成一条路由,这样做既减少了路由条目,又不会影响网络的连通性。
2、拓扑规划:
3、IP地址规划:
设备
接口
IP地址及其子网掩码
R1(Quidway S3526)
E0/9
192.168.1.1/24
Loopback 1
172.16.4.1/24
172.16.5.1/24
172.16.6.1/24
172.16.7.1/24
R2(Quidway S3526)
E0/9
192.168.1.2/24
E0/17
192.168.2.1/24
R3(Quidway 2600s)
E1
192.168.2.2/24
E0
192.168.3.1/24
R4(Quidway AR-28-31)
E0/0
192.168.3.2/24
4、案例实施:
1)、配置IP地址与ospf区域信息
R1配置:
sysname R1
local-user admin
password cipher %K/T]3SXOF$[FR9&2:*aF1!!
service-type telnet level 3
user-interface vty 0 4
authentication-mode scheme
vlan 10
#
interface Vlan-interface10
ipaddress 192.168.1.1 255.255.255.0
interface Ethernet0/9
portaccess vlan 10
interface LoopBack1
ipaddress 172.16.4.1 255.255.255.0
ipaddress 172.16.5.1 255.255.255.0 sub #sub表示启用多个IP
ipaddress 172.16.6.1 255.255.255.0 sub
ipaddress 172.16.7.1 255.255.255.0 sub
ospf
area0.0.0.2
network 192.168.1.1 0.0.0.0
network 172.16.4.1 0.0.0.0
network 172.16.5.1 0.0.0.0
network 172.16.6.1 0.0.0.0
network 172.16.7.1 0.0.0.0
R2配置:
sysname R2
local-user admin
password cipherQ_E4WOL3a+&AYP51,NO;"A!!
service-type telnet level 3
user-interface vty 0 4
authentication-mode scheme
vlan 10
vlan 20
#
interface Vlan-interface10
ipaddress 192.168.1.2 255.255.255.0
#
interface Vlan-interface20
ipaddress 192.168.2.1 255.255.255.0
interface Ethernet0/9
portaccess vlan 10
interface Ethernet0/17
portaccess vlan 20
ospf
area0.0.0.2
network 192.168.1.2 0.0.0.0
#
area0.0.0.0
network 192.168.2.1 0.0.0.0
R3配置:
local-user admin service-type administratorpassword cipher /P.G'J<G@HG-JEXJQ<%DJQ!!
sysname R3
interface Ethernet0
ip address 192.168.3.1 255.255.255.0
ospf enable area 0.0.0.1
!
interface Ethernet1
ip address 192.168.2.2 255.255.255.0
ospf enable area0.0.0.0
ospf enable
R4配置:
sysname R4
local-user admin
password cipher.]@USE=B,53Q=^Q`MAF4<<"TX$_S#6.NM(0=0\)*5WWQ=^Q`MAF4<<"TX$_S#6.N
service-type telnet terminal
level 3
user-interface vty 0 4
authentication-mode scheme
interface Ethernet0/0
ipaddress 192.168.3.2 255.255.255.0
ospf 1
area0.0.0.1
network 192.168.3.2 0.0.0.0
2)、在ABR(区域边界路由器)上做路由汇总,减少路由表条目
在R4上查看完整的路由表:
在R2的区域2上做路由汇总:
ospf
area0.0.0.2
network 192.168.1.2 0.0.0.0
abr-summary 172.16.4.0 255.255.252.0 advertise
#表示在ABR上做汇总,汇总后的网段和子网掩码
在R4上查看路由表:
汇总后只能看到172.16.4.0/22,但是其内含的网段依然能ping通: