Lab21 (1130260)
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Лабораторная работа № 21. Изучение маршрутных петель
Objectives:
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Configure a WAN connection between Lab-A and Lab-E.
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Demonstrate your ability to configure Serial interfaces.
Step 1 - Verify that all physical connections are correct.
Review the standard semester 2 Lab diagram in the overview section of this lab. You will add a 4th set of V.35 WAN serial cables (DTE male/ DCE female) to connect from router Lab-A interface S1 to router Lab-E interface S0.
Step 2 - Configure Lab-A serial 1 interface.
Login to the router and enter the interface configuration mode. Configure interface serial 1 with the following information (this is a new class C IP address):
IP address 220.68.33.2
Subnet Mask 255.255.255.0
Bandwidth of 56
Step 3 - Configure IP host and RIP networks.
After you have finished the configuration for the interface, you will need to add the 220.68.33.0 network with the network command to all 5 routers. Also, add the new IP address to the host table entry for routers Lab-A and Lab-E for name resolution to all routers.
Step 4 - Configure Lab-E serial 0 interface.
Repeat steps 2 and 3 for Lab-E interface serial 0 with the following information:
IP address 220.68.33.1
Subnet Mask 255.255.255.0
Clock rate 56000
Bandwidth of 56
Step 5 - Test your setup.
When you have configured Lab-A's and Lab-E's interfaces, check off the items in the list:
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Ping from all routers to 220.68.33.1
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Ping from all routers to 220.68.2
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Ping from all Workstations to 220.68.33.1
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Ping from all Workstations to 220.68.33.2
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Telnet from Lab-C to 220.68.33.1
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Telnet from Lab-C to 220.68.33.2
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Telnet from Workstation to 220.68.33.1
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Telnet from Workstation to 220.68.33.2
Step 6 - Troubleshooting.
If you were not able to finish step 5 then use your troubleshooting skills learned in previous labs to correct the problem. After you have successfully finished step 5 save the running configuration to the startup configuration for all routers.
Lab 21.2 Preventing routing loops
Estimated time: 45 min.
Objectives:
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Understand methods of controlling routing loops including hold-down timers, defining a maximum hop count, counting to infinity, poison reverse and split-horizon.
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Adjust the RIP maximum hop count to control routing loops.
Step 1 – Turn on debugging.
Working with router Lab-C, turn on debugging with the debug ip rip command.
Step 2 – Shutdown Lab-A’s Ethernet 0 interface.
Shutdown Lab-A’s Ethernet 0 interface. From Lab-C, watch the routing information and use the show ip route command to see how many routing updates it takes to flush out Lab-A’s Ethernet 0 network.
1. How many updates did it take to converge?
Step 3 – Enable Lab-A’s Ethernet 0 interface.
On Lab-A bring Ethernet 0 back up and allow enough time for the network to converge.
Step 4 – Configure default metric, timers basic and split-horizon on Lab-C.
There are other timers that can be modified to help avoid routing loops. This lab focuses on hop count. Change the RIP maximum hop count on router Lab-C to 10 (the default is 16), adjust the routing timers and split horizon using the following commands:
Lab-C#conf t
Lab-C(config)#router rip
Lab-C(config-router)#default-metric 10
Lab-C(config-router)#timers basic 30 60 150 30
Lab-C(config-router)#exit
Lab-C(config)#int s0
Lab-C(config-if)#ip split-horizon
Lab-C(config-if)#int s1
Lab-C(config-if)#ip split-horizon
Lab-C(config-if)#^Z
Lab-C#
Step 5 - Shutdown Lab-A's Ethernet 0 interface.
Shutdown Lab-A's Ethernet 0 interface. From Lab-C, watch the routing information and use the show ip route command to see how many routing updates it takes to flush out Lab-A's Ethernet 0 network.
2. How many updates did it take to converge?
3. Compare question 1 and 2 and explain why the network converged faster after changing the default metric, timers and split horizon.
3
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