Experiment simple application of EIGRP
1. Purpose of experiment
Through this experiment, you can:
1) master the basic configuration of EIGRP
2) understand EIGRP’s neighbor table , The meaning of the topology table and the routing table
3) Master and view the relevant information of the EIGRP routing protocol
4) Master the meaning of FD, AD, S, FS and FC
5) Understand the role of EIGRP’s hello message
6) Understand the meaning of fast routing convergence
7) Understand EIGRP’s unequal-cost load balancing
2, experimental requirements
1) Refer to the logical topology , Use appropriate cables to complete the physical topology.
2) Complete the basic configuration of each router to realize that each directly connected device can ping each other. It is required that the IP address of PC1 is set to 172.16.1.1/24, the gateway is set to 172.16.1.254, and that of PC2 is set to
br>The IP address is set to 172.16.3.1/24, the gateway is set to 172.16.3.254, and the addresses between the router interfaces are planned by themselves.
3) Enable EIGRP on the entire network, advertise their directly connected network routes, and turn off automatic summarization.
4) Use the show ip protocols command on R1 to observe and understand the output information of the command.
5) Check the neighbor table, topology table and routing table of each router to find out important information such as FD, AD, and S
.
6) Test the connectivity between PC1 and PC2.
7) Add a loopback1 interface on R2 with an address of 200.200.200.200/24, and then advertise in
EIGRP to observe whether R1 and R3 can immediately learn the newly added loopback1
network segment on R2 , And test the connectivity between each host and the loopback1.
8) Use wireshark to capture EIGRP packets and understand the meaning of each field in EIGRP packets.
9) Add a loopback1 interface on R1 with an address of 100.100.100.100/24, and then announce it in
EIGRP.
10) Disconnect the connection between R1 and R3 and each host, connect the Ethernet interface between R1 and R3,
complete the necessary configuration to realize the unequal value of 200.200.200.200 access to 100.100.100.100< br>Load balance.
3. Experimental steps
Network topology:
Step One
After setting up the network topology, configure an IP address for each interface of each device.
Note: The two PCs in the picture are the router closes the routing function and change the symbol
PC machine configuration
IOU5#enable ——Enter the privileged mode
IOU5#configure——Enter the configuration mode< br>IOU5(config)#interface e0/0——Enter interface e0/0
IOU5(config-if)#no shutdown——Open the interface
IOU5(config-if)#ip address 172.16.2.1 255.255 .255.0 ——Add IP address and subnet mask
IOU5(config)#no ip routing——Close routing function
Router configuration
IOU1#enable
IOU1#configure
IOU1(config)#interface e0/1
IOU1(config-if)#no shutdown
IOU1(config-if)#ip address 172.16.1.254 255.255.255.0
Step two
Currently, only direct The connected interfaces can ping each other, and the entire network has not been interoperable yet. Now we enable EIGRP throughout the entire network.
After each router is configured.
Basic configuration:
IOU1(config)#router eigrp 90——Enable EIGRP routing protocol, 90 is the selected AS number
IOU1(config-router)#network 172.16.1.0 0.0.0.255——Notification
IOU1(config-router)#network 192.168.12.0——Notify the network segment, the default is the main network segment
IOU1(config-router)#no auto-summary —— Turn off automatic summary
Note: Announce the network segment, the selected AS number for enabling EIGRP must be consistent to communicate (90 is also the internal management distance, for the convenience of remembering)
Enable EIGRP, advertise their directly connected network routes, and turn off automatic aggregation. Now the entire network can communicate.
Step three
IOU1(config)#do show ip eigrp neighbors——View the EIGRP neighbors discovered by the router
EIGRP-IPv4 Neighbors for AS(90)——AS number is 90
IOU1(config)#do show ip eigrp topology ——Check the router’s network topology table
P 192.168 .23.0/24, 1 successors, FD is 2195456——The distance to the successor (S) of the 192.168.23.0/24 network segment is 1, and the FD is 2195456
Note: FD–feasibility distance: to reach the destination metric.
AD–Advertising distance: the metric value of the next hop to reach the destination. IOU1(config)#do show ip route eigrp ——View the EIGRP route learned by the router
Step 4
IOU2(config)#interface loopback 0——Enter a loopback interface
IOU2(config-if)#ip address 200.200.200.200 255.255 .255.0——Add an IP address and subnet mask to the interface
IOU2(config-if)#no shutdown ——Open the interface
IOU2(config)#router eigrp 90——Enable EIGRP routing protocol, AS No. 90
IOU2(config-router)#network 200.200.200.200 0.0.0.255——Announce 200.200.200.0/24 network segment
IOU2(config-router)#no auto-summary ——Turn off auto-summary
You can learn this new addition immediately on R2 and R3 , And can ping through.
Step 5
Disconnect the connection between R1 and R3 and each host, and connect the Ethernet interface between R1 and R3
to achieve 200.200.200.200 access to 100.100.100.100 unequal load balancing
Access 100.100.100.0/24, only from the interface IP of 192.168.12.1, In order to achieve unequal cost load balancing, let R2 access from 192.168.23.1.
The FD (feasibility distance) value from R2 to R1 is 409600, and the FD value from R3 to R1 is also 409600, because the FD value from R3 to R1 is equal to the AD (advertised distance) of R2. So FC (feasibility condition) is not met, so there is no FS (feasibility successor), so we can increase the FD from R2 to R2, because by default FD = bandwidth + delay, so we only need to increase the delay Make FD>AD.
IOU2(config)#do show interfaces e0/0——View e0/0 interface information
IOU2(config)#interface e0/0——Enter e0/0 interface
IOU2(config-if) #delay 200——Modify the bandwidth to 200×10
IOU2#clear ip eigrp neighbors ——Rebuild neighbors
We can see that there are two paths to access 100.100.100.100.
Commands used
IOU5#enable ——Enter privileged mode
IOU5#configure——Enter configuration mode
IOU5(config)#interface e0 /0——Enter interface e0/0
IOU5(config-if)#no shutdown——Turn on interface
IOU5(config-if)#ip address 172.16.2.1 255.255.255.0 ——Add IP address and subnet Mask
IOU5(config)#no ip routing——Close routing function
IOU1#enable
IOU1#configure
IOU1(config)#interface e0/1
IOU1(config-if )#no shutdown
IOU1(config-if)#ip address 172.16.1.254 255.255.255.0
IOU1(config)#router eigrp 90——Enable EIGRP routing protocol, 90 is the selected AS number
IOU1 (config-router)#network 172.16.1.0 0.0.0.255-advertised network segment, and reverse mask
IOU1(config-router)#network 192.168.12.0-advertised network segment, the default is the main class network segment
IOU1(config-router)#no auto-summary-turn off auto-summary
IOU1(config)#do show ip eigrp neighbors-view EIGRP neighbors discovered by the router
IOU1(config)#do show ip eigrp topology ——Check the network topology table of the router
IOU1(config)#do show ip route eigrp ——Check the EIGRP routes learned by the router
IOU2(config)#interface loopback 0——Enter a loopback Interface
IOU2(config-if)#ip address 200.200.200.200 255.255.255.0——Add an IP address and subnet mask to the interface
IOU2(config-if)#no shutdown ——Open the interface
IOU2(con fig)#router eigrp 90——Enable EIGRP routing protocol, AS number 90
IOU2(config-router)#network 200.200.200.200 0.0.0.255——Notify 200.200.200.0/24 network segment
IOU2(config- router)#no auto-summary ——Turn off automatic summary
IOU2(config)#do show interfaces e0/0——View e0/0 interface information
IOU2(config)#interface e0/0——Enter e0 /0interface
IOU2(config-if)#delay 200——Modify the bandwidth to 200*10
IOU2#clear ip eigrp neighbors ——Rebuild neighbors
Troubleshooting commands< /strong>
do show run | section router eigrp//View the configuration command of eigrp in the configuration file
show ip protocols//View the status of the eigrp protocol running on the current router
show ip route summary//View eigrp Route summary status
show ip eigrp neighbors//View eigrp neighbor status
show ip eigrp interface//View the status of each running eigrp
show ip eigrp interface detail//View the detailed status of each running eigrp
show ip route eigrp//View the routing table learned by the eigrp protocol
show ip eigrp topology//View the topology table of eigrp
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