水平分割之eigrp split horizon(1)(2)
查看帧中继建立情况
- R1#sh frame map
- Serial0/0 (up): ip 11.1.1.2 dlci 102(0x66,0x1860), static,
- broadcast,
- CISCO, status defined, active
- Serial0/0 (up): ip 11.1.1.3 dlci 103(0x67,0x1870), static,
- broadcast,
- CISCO, status defined, active
- R2#sh frame map
- Serial0/0 (up): ip 11.1.1.1 dlci 201(0xC9,0x3090), static,
- broadcast,
- CISCO, status defined, active
- R3#sh frame map
- Serial0/0 (up): ip 11.1.1.1 dlci 301(0x12D,0x48D0), static,
- broadcast,
- CISCO, status defined, active
已经建立完毕
测试连通性:
- R3#ping 11.1.1.1
- Type escape sequence to abort.
- Sending 5, 100-byte ICMP Echos to 11.1.1.1, timeout is 2 seconds:
- Success rate is 100 percent (5/5), round-trip min/avg/max = 48/77/96 ms
帧中继有水平分割,在rip协议中,帧中继的水平分割默认是被关闭的,在eigrp协议中 帧中继的水平分割默认是被打开的 可查看R1的S0/0接口
- R1#sh ip int s0/0
- Serial0/0 is up, line protocol is up
- Internet address is 11.1.1.1/24
- Broadcast address is 255.255.255.255
- Address determined by setup command
- MTU is 1500 bytes
- Helper address is not set
- Directed broadcast forwarding is disabled
- Multicast reserved groups joined: 224.0.0.9
- Outgoing access list is not set
- Inbound access list is not set
- Proxy ARP is enabled
- Local Proxy ARP is disabled
- Security level is default
- Split horizon is disabled
- ICMP redirects are always sent
- ICMP unreachables are always sent
- ICMP mask replies are never sent
- IP fast switching is enabled
- IP fast switching on the same interface is enabled
- IP Flow switching is disabled
我们分别用 rip 和 eigrp做同样的实验,首先每台路由器启动RIP,通过查看路由表可以发现,R2 R3会学到对方的路由。
- R2#sh ip route
- 1.0.0.0/24 is subnetted, 1 subnets
- R 1.1.1.0 [120/1] via 11.1.1.1, 00:00:04, Serial0/0
- 2.0.0.0/24 is subnetted, 1 subnets
- C 2.2.2.0 is directly connected, Loopback0
- 3.0.0.0/24 is subnetted, 1 subnets
- R 3.3.3.0 [120/2] via 11.1.1.3, 00:00:04, Serial0/0
- 11.0.0.0/24 is subnetted, 1 subnets
- C 11.1.1.0 is directly connected, Serial0/0
可以看到3.3.3.0的路由
- R3#sh ip route
- 1.0.0.0/24 is subnetted, 1 subnets
- R 1.1.1.0 [120/1] via 11.1.1.1, 00:00:06, Serial0/0
- 2.0.0.0/24 is subnetted, 1 subnets
- R 2.2.2.0 [120/2] via 11.1.1.2, 00:00:06, Serial0/0
- 3.0.0.0/24 is subnetted, 1 subnets
- C 3.3.3.0 is directly connected, Loopback0
- 11.0.0.0/24 is subnetted, 1 subnets
- C 11.1.1.0 is directly connected, Serial0/0
可以看到有2.2.2.0 的路由
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