EIGRP 2010-05-24 08:59:23 閱讀83 評論0 字號:大中小 訂閱
R4模擬一個外網(wǎng)網(wǎng)絡(luò),在內(nèi)網(wǎng)做一個默認(rèn)路由!
配置好各個端口的IP后,通告路由
R1
Router eigrp 100
Net 172.16.0.0
R2
Router eigrp 100
Net 172.16.0.0
R3
Router eigrp 100
Net 172.16.0.0
而后在R3上配置一條通向R4的缺省路由
R3(config)#ip route 0.0.0.0 0.0.0.0 11.1.1.2
這樣在R3就能通向外網(wǎng)了
R3#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
但在R1R2是不通的
路由器R3作為邊境路由器配置了靜態(tài)路由,可以直接訪問外部,但是內(nèi)部的R1和R2路由器由于缺少路由,因此無法訪問外網(wǎng)。
我們在R1R2上配置靜態(tài)路由
當(dāng)然并也要在R4上配置一個靜態(tài)路由
R1(config)#ip route 0.0.0.0 0.0.0.0 172.16.1.2
R2(config)#ip route 0.0.0.0 0.0.0.0 172.16.2.2
R4(config)#ip route 0.0.0.0 0.0.0.0 192.168.10.1
R1#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/60/112 ms
R2#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/51/96 ms
如果內(nèi)網(wǎng)中路由器很多的話,配置逐個靜態(tài)路由就太過繁瑣
則可以用“ip default network” 命令
R3(config)#router eigrp 100
R3(config-router)#net 11.0.0.0 //在這個AS中通告這個默認(rèn)出口的網(wǎng)絡(luò)
R3(config)#ip default-network 11.0.0.0
在R1 R2上查看路由表
R1
Gateway of last resort is 172.16.1.2 to network 11.0.0.0
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Serial1/0
D 172.16.2.0 [90/2681856] via 172.16.1.2, 00:56:58, Serial1/0
D* 11.0.0.0/8 [90/2681856] via 172.16.1.2, 00:00:05, Serial1/0
R2
Gateway of last resort is 172.16.2.2 to network 11.0.0.0
172.16.0.0/24 is subnetted, 2 subnets
D 172.16.1.0 [90/2681856] via 172.16.2.2, 00:57:40, Serial1/0
C 172.16.2.0 is directly connected, Serial1/0
D* 11.0.0.0/8 [90/2681856] via 172.16.2.2, 00:01:08, Serial1/0
在ping外部網(wǎng)段就可以ping的通了
ip default network 命令可以向全網(wǎng)絡(luò)通告缺省網(wǎng)絡(luò)
注意:在工大瑞工的論壇上 ,使用ip default-network其指出默認(rèn)網(wǎng)絡(luò),建議采用主類網(wǎng)絡(luò)。如果使用無類網(wǎng)絡(luò),則可能會出現(xiàn)無法解釋的問題。
確實如此