PR AC T IC E L A B : I n T ROD UC T IOn TO I P ROU T I nG in .NET

Implement USS Code 128 in .NET PR AC T IC E L A B : I n T ROD UC T IOn TO I P ROU T I nG
PR AC T IC E L A B : I n T ROD UC T IOn TO I P ROU T I nG
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7. Repeat the necessary steps above to build a static route on PE2 that points to the system interface on PE1. Be sure to confirm that it appears correctly in the route table on PE2.
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*A:PE2# configure router static-route 140.10.0.1/32 next-hop 140.10.0.97 *A:PE2#
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8. Repeat the test of pinging the system interface of PE2 from PE1. (You may want to turn off debugging to make it easier to distinguish the output.) 8a. Did PE1 successfully transmit a ping request How do you know 8b. Did PE2 successfully receive a ping request How do you know 8c. What are the exact source and destination addresses in the ping packets 8d. Does PE1 have a correct, functioning route to the system address of PE2 Does PE2 have a functioning route to the system interface of PE1 8e. Was the ping command successful How do you know 8f. Explain why the ping was successful or not. 9. Test both PE routers to determine whether you can ping the loopback interfaces of the remote PE router. 9a. Which loopback interfaces are reachable, if any Explain why or why not 10. Removing a static route requires typing the exact route again, except with the option no in front of static-route. Remove the static route. (Try making some intentional typing mistakes in the addresses, to see what kind of error messages you get.)
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*A:PE2# configure router no static-route 140.10.0.1/32 next-hop 140.10.0.97 *A:PE2#
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10a. How can you confirm that a static route has been successfully removed 11. As the last step, use the ping command to verify that both PE routers have a correct, functioning static route to the other router s system interface. 11a. What did you learn For successful communication, how many routes are required between a source and destination Do not forget this important rule!!!
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C h a p t e r 8 n I n t roduC t Ion t o I p rou t I ng
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Lab Section 8.2: Default Routes and Router Logic
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In the previous exercise, the static routes were fairly simple: Traffic destined for a particular subnet was sent to a particular next-hop address. In this lab, we use three different kinds of static routes. These are shown in Figure 8.21 as aggregate routes, default routes, and simple routes. Together they provide enough flexibility to handle just about every situation.
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Figure 8.21 Three different types of static routes are used from CE to PE and from PE to PE in this lab exercise.
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CE1 ISP 1 140.10.0.0/24 simple static routes PE1 ISP 2 150.10.0.0/24 aggregate route PE2
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Consider for a moment the CE1 router. Since there is only one single connection to the rest of the (Inter)network, the next-hop address would always be the same for every single static route. It seems pointless to have many, many static routes all giving the same next hop. A default route provides a solution a single routing entry that effectively says: Any other destination uses [PE1] as the next hop. This route will be used for any destination subnet that isn t local to CE1. next, let s look at the network from PE2 s perspective. All hosts in the subnet 140.10.0.0/24 exist somewhere within ISP 1. Exactly where a host resides within ISP 1 isn t a concern for PE2; that s PE1 s job to sort out. All PE2 needs to know is that any address within 140.10.0.0/24 should be forwarded to PE1 as the next hop. PE2 uses an aggregate route for the /24 subnet without considering whether every single possible
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PR AC T IC E L A B : I n T ROD UC T IOn TO I P ROU T I nG
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host within that range actually exists. (In fact, there may be many addresses and entire blocks for which no hosts exist!) The key point of the aggregate route is that there are no hosts outside of ISP 1 for the 140.10.0.0/24 range. Likewise for PE1: It should be configured so that traffic for all possible hosts in the 150.10.0.0/24 range is sent via PE2. This set of lab exercises makes use of all three types of routes (simple, aggregate, and default) to get full connectivity between the routers with a minimum number of entries in each router s routing table. The CE device uses a default route toward PE1; PE1 will use simple static routes toward the subnets associated with CE1; and both PE routers will use aggregate routes for the neighbor s IP subnet. Objective In this exercise, you will become more familiar with static routes by configuring a variety of static routes to provide full connectivity to all interfaces from all routers. Validation You will know you have succeeded if every router can ping every interface on every other router. 1. Figure 8.21 shows only the static routes for CE1, PE1, and PE2. Complete the figure by drawing the static routes that ISP 3 and ISP 4 would use to reach 140.10.0.0/24. Label each route with its type (simple, aggregate, or default) and the next-hop interface. 1a. For the shortest path, how many alternatives are there for ISP 3 to reach 140.10.0.0/24 1b. For the shortest path, how many alternatives are there for ISP 4 to reach 140.10.0.0/24 1c. If ISP 3 does not use the shortest path, can traffic still reach 140.10.0.0/24 2. Remove all previously configured static routes (see the previous exercise). Confirm that all static routes have been removed (see the previous exercise; all routes should have a type of Local). 3. Configure aggregate static routes between PE1 and PE2. Confirm that you can ping every interface on PE2 from PE1 and vice versa.
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*B:PE1# configure router static-route 150.10.0.0/24 next-hop 140.10.0.98 *B:PE1# *A:PE2# configure router static-route 140.10.0.0/24 next-hop 140.10.0.97 *A:PE2#
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