浮動靜態路由
實驗目的：
1． 使用浮動靜態路由實現路由備份
2． 觀察動態路由EIGRP與靜態路由之間的轉換
3． 浮動靜態路由本身是靜態路由，浮動是指當原來的路由失效才啓用該路由，在配置靜態路由時需要將其管理距離做相應的調整，使其大於正常使用的其他路由協議獲悉的路由。
實驗拓撲：
實驗配置：
R1# show running-config
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface Serial0/1
ip address 16.16.16.1 255.255.255.0
!
interface Ethernet1/1
ip address 192.168.0.1 255.255.255.0
half-duplex
router eigrp 1
network 1.1.1.0 0.0.0.255
network 16.16.16.0 0.0.0.255
no auto-summary（如果不關閉自動彙總，則EIGRP宣告彙總的1.0.0.0/8網絡，此時在R6上配置的到1.1.1.0/24的靜態路由，EIGRP認爲這是2個不同的網絡，R6上的靜態路由將被認爲是普通的靜態路由而非浮動靜態路由）
ip route 6.6.6.0 255.255.255.0 192.168.0.2 200
R6#show running-config
interface Loopback0
ip address 6.6.6.6 255.255.255.0
interface Serial0/1
ip address 16.16.16.6 255.255.255.0
interface Ethernet1/1
ip address 192.168.0.2 255.255.255.0
half-duplex
!
router eigrp 1
network 6.0.0.0
network 16.16.16.0 0.0.0.255
no auto-summary
!
ip route 1.1.1.0 255.255.255.0 192.168.0.1 200
!
實驗驗證：
R1#sh ip route
Gateway of last resort is not set
16.0.0.0/24 is subnetted, 1 subnets
C 16.16.16.0 is directly connected, Serial0/1
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
6.0.0.0/24 is subnetted, 1 subnets
D 6.6.6.0 [90/2297856] via 16.16.16.6, 00:05:20, Serial0/1
C 192.168.0.0/24 is directly connected, Ethernet1/1
可見在R1的路由表上沒有顯示到6.6.6.0/24網絡的靜態路由，如果配置帶送出藉口的靜態路由，路由器會認爲該網絡是直連的。
R6#sh ip route
16.0.0.0/24 is subnetted, 1 subnets
C 16.16.16.0 is directly connected, Serial0/1
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/2297856] via 16.16.16.1, 00:06:38, Serial0/1
6.0.0.0/24 is subnetted, 1 subnets
C 6.6.6.0 is directly connected, Loopback0
C 192.168.0.0/24 is directly connected, Ethernet1
在R1上:
R1#ping 6.6.6.6 repeat 1000 在R6上關閉s0/1接口在開啓
R1#ping 6.6.6.6 repeat 1000
Sending 1000, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!.......!!!!!!!!!
Jul 20 19:56:49.019: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 16.16.16.6 (Serial0/1) is down: holding time expired!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Jul 20 19:56:58.971: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 16.16.16.6 (Serial0/1) is up: new adjacency!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!!!!!
Jul 20 19:57:03.051: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
Jul 20 19:57:03.179: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 16.16.16.6 (Serial0/1) is down: interface down!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Jul 20 19:57:12.543: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 16.16.16.6 (Serial0/1) is up: new adjacency
Jul 20 19:57:13.051: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
Success rate is 99 percent (992/1000), round-trip min/avg/max = 4/44/208 ms在R6上:
R6(config)#int s0/1
R6(config-if)#sh
R6#sh ip route
1.0.0.0/24 is subnetted, 1 subnets
S 1.1.1.0 [200/0] via 192.168.0.1（當s0/1鏈路失效時就啓用備份路由）
6.0.0.0/24 is subnetted, 1 subnets
C 6.6.6.0 is directly connected, Loopback0
C 192.168.0.0/24 is directly connected, Ethernet1/1