一、浮动静态路由
浮动静态路由的作用是实现备份路由
1、原理:如果链路发生故障,浮动静态路由即为主要静态或动态路由提供备份路径的静态路由。 浮动静态路由仅在主路由不可用时使用。 为了完成此操作,浮动静态路由配置了比主路由更高的管理距离
2、操作:浮动静态路由可配置为通过控制管理距离值来备份主链路。 通过配置浮动静态路由做到路由备份,实现在网络中路由的有备无患。
3、简单的例子
拓扑结构:
主机的IP地址:
PC1
PC2
路由器的配置
Router 1:
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#host
R2(config)#hostname R1
R1(config)#int g 0/0
R1(config-if)#ip add
R1(config-if)#ip address 192.168.1.254 255.255.255.0(接口0/0 的IP地址)
R1(config-if)#no shu
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up
R1(config-if)#e
R1(config-if)#exit
R1(config)#int g 0/1
R1(config-if)#ip address 192.168.12.1 255.255.255.0(接口0/1 的IP地址)
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up
R1(config-if)#e
R1(config)#int g 0/2
R1(config-if)#ip address 192.168.21.1 255.255.255.0(接口0/2 的IP地址)
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
R1(config-if)#e
R1(config)#
R1(config)#ip route 192.168.2.0 255.255.255.0 192.168.12.2(配置静态路由)
R1(config)#ip route 192.168.2.0 255.255.255.0 192.168.21.2 10(10代表的是开销,只要比1大就好)(这一条就是备份的,也是浮动静态路由)
R1(config)#do show ip route(查看路由表信息)
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, GigabitEthernet0/0
L 192.168.1.254/32 is directly connected, GigabitEthernet0/0
S 192.168.2.0/24 [1/0] via 192.168.12.2([1/0] 1代表的是管理距离(管理距离越小,优先级越高)0代表的是开销 )
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/1
L 192.168.12.1/32 is directly connected, GigabitEthernet0/1
192.168.21.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.21.0/24 is directly connected, GigabitEthernet0/2
L 192.168.21.1/32 is directly connected, GigabitEthernet0/2
R1(config)#
路由器2的配置跟1差不多相同
Router 2 :
R2(config-if)#e
R2(config-if)#exit
R2(config)#int g 0/1
R2(config-if)#ip address 192.168.12.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
R2(config-if)#e
R2(config)#int g 0/2
R2(config-if)#ip address 192.168.21.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up
R2(config-if)#e
R2(config)#ip route 192.168.1.0 255.255.255.0 192.168.12.1
R2(config)#ip route 192.168.1.0 255.255.255.0 192.168.21.1 10
R2#show ip route (特权模式下不用加 do)
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
S 192.168.1.0/24 [1/0] via 192.168.12.1
192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.2.0/24 is directly connected, GigabitEthernet0/0
L 192.168.2.254/32 is directly connected, GigabitEthernet0/0
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/1
L 192.168.12.2/32 is directly connected, GigabitEthernet0/1
192.168.21.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.21.0/24 is directly connected, GigabitEthernet0/2
L 192.168.21.2/32 is directly connected, GigabitEthernet0/2
结果验证
PC1 ping PC2
二、缺省路由
什么时候用到缺省路由呢?
答:当数据无论想去那个网络,都得通过那个路由器,这时候就可以把路由器设置成缺省(默认)路由。
例子:
相关代码:
Route 1:
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host
Router(config)#hostname R1
R1(config)#in
R1(config)#int g
R1(config)#int gigabitEthernet 0/0
R1(config-if)#ip add
R1(config-if)#ip address 192.168.1.254 255.255.255.0
R1(config-if)#no sh
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up
R1(config-if)#e
R1(config-if)#exit
R1(config)#int g 0/1
R1(config-if)#ip add
R1(config-if)#ip address
R1(config-if)#ip address 192.168.3.254 255.255.255.0
R1(config-if)#no sh
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
R1(config-if)#e
R1(config-if)#exit
R1(config)#int g0/2
R1(config-if)#ip add
R1(config-if)#ip address 192.168.12.1 255.255.255.0
R1(config-if)#no sh
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
R1(config-if)#e
R1(config-if)#exit
R1(config)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 (配置缺省路由,所有的目标网络表达为0.0.0.0 掩码为0.0.0.0)
R1(config)#do show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 192.168.12.2 to network 0.0.0.0
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, GigabitEthernet0/0
L 192.168.1.254/32 is directly connected, GigabitEthernet0/0
192.168.3.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.3.0/24 is directly connected, GigabitEthernet0/1
L 192.168.3.254/32 is directly connected, GigabitEthernet0/1
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/2
L 192.168.12.1/32 is directly connected, GigabitEthernet0/2
S* 0.0.0.0/0 [1/0] via 192.168.12.2 (说明缺省路由配置成功)
Route 2: (跟R1大致一样)
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host
Router(config)#hostname R2
R2(config)#int g 0/0
R2(config-if)#ip add
R2(config-if)#ip address 192.168.2.254 255.255.255.0
R2(config-if)#no sh
R2(config-if)#no shutdown
R2(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up
R2(config-if)#e
R2(config-if)#exit
R2(config)#int g 0/1
R2(config-if)#ip add
R2(config-if)#ip address 192.168.4.254 255.255.255.0
R2(config-if)#no sh
R2(config-if)#no shutdown
R2(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
e
R2(config-if)#exit
R2(config)#int g 0/2
R2(config-if)#ip add
R2(config-if)#ip address 192.168.12.2 255.255.255.0
R2(config-if)#no s
R2(config-if)#no sh
R2(config-if)#no shutdown
R2(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/2, changed state to up
R2(config-if)#e
R2(config-if)#exit
R2(config)#ip rou
R2(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.1
R2(config)#do show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 192.168.12.1 to network 0.0.0.0
192.168.2.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.2.0/24 is directly connected, GigabitEthernet0/0
L 192.168.2.254/32 is directly connected, GigabitEthernet0/0
192.168.4.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.4.0/24 is directly connected, GigabitEthernet0/1
L 192.168.4.254/32 is directly connected, GigabitEthernet0/1
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/2
L 192.168.12.2/32 is directly connected, GigabitEthernet0/2
S* 0.0.0.0/0 [1/0] via 192.168.12.1
结果:
所有网络可以互相Ping通
嘿嘿,这篇文章就到这结束啦,加油。