Lab Section 9.1: Single Area OSPF in .NET

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Lab Section 9.1: Single Area OSPF
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This exercise uses the routers in a new configuration. They are all now part of the same domain, belonging to a single ISP as shown in Figure 9.11. (Imagine this is due
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to a corporate merger.) For the purposes of this lab section, CE1 is considered as belonging to part of the ISP core. There are no changes to the addressing scheme. Objective In this exercise, you will configure a single area OSPF network. This lab will demonstrate the different databases that are created by the OSPF routing protocol. Validation You will know you have succeeded if every router can ping every interface on every other router.
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Figure 9.11 This configuration of three routers allows us to explore the key aspects of OSPF routing.
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CE1 Single-domain ISP PE1 PE2
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ISP 3
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Please remove all static routes configured on CE1 and the PE devices in the previous labs. Refer to Lab Section 8.1 in 8. Confirm that all routes have been removed by ensuring that each router s routing table contains only routes of type Local.
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1. The first step is to enable the OSPF routing process on the router:
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*B:PE1# configure router ospf *B:PE1>config>router>ospf$
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2. Next define the area that the interfaces will be placed in. Remember that the area must match on the interfaces on both ends of a link for OSPF to establish an
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C H A P T E R 9 : OPE N SHO RT E S T PAT H F I R S T (O SPF )
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adjacency. The objective of this exercise is to configure a single area OSPF network; therefore, you should use the same area number.
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*B:PE1>config>router>ospf$ area 0 *B:PE1>config>router>ospf>area$
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3. within this area, enter all the interfaces on which OSPF should be running and sending out its advertisements. The system interface is a special case and should always be included in OSPF. In this case, place all the local interfaces into the OSPF process area 0. Do not include the loopback interfaces; they are used to demonstrate another feature of OSPF in a later step.
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*B:PE1>config>router>ospf>area$ interface system *B:PE1>config>router>ospf>area>if$ exit *B:PE1>config>router>ospf>area# interface toPE2 *B:PE1>config>router>ospf>area>if$ exit *B:PE1>config>router>ospf>area# interface toCE1 *B:PE1>config>router>ospf>area>if$ exit *B:PE1>config>router>ospf>area# exit *B:PE1>config>router>ospf#
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4. Continue with configuring OSPF on all other routers in the domain. Don t forget to include the system interfaces! 4a. How many routes are in each route table 4b. what is the preference and metric value of each OSPF route 5. Use a show command to look at the OSPF neighbors of each router.
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*B:PE1>config>router>ospf# show router ospf neighbor ======================================================= OSPF Neighbors ======================================================= Interface-Name Rtr Id State Pri RetxQ TTL ------------------------------------------------------toPE2 150.10.0.1 Full 1 0 35 toCE1 140.10.0.3 Full 1 0 34 ------------------------------------------------------No. of Neighbors: 2 ======================================================= *B:PE1>config>router>ospf#
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5a. How many neighbors do you see on PE1 PE2 CE1 5b. what is the state of the adjacencies what should they be why 6. Use a show command to display the OSPF Link State database. This database is a listing of all LSAs that have been received by the router. It is these LSAs that the SPF algorithm uses to create the forwarding table.
*B:PE1>config>router>ospf# show router ospf database ================================================================== OSPF Link State Database (Type : All) ================================================================== Type Area Id Link State Id Adv Rtr Id Age Sequence Cksum -----------------------------------------------------------------Router 0.0.0.0 140.10.0.1 140.10.0.1 522 0x80000008 0x1b9b Router 0.0.0.0 140.10.0.3 140.10.0.3 515 0x80000005 0xd83d Router 0.0.0.0 150.10.0.1 150.10.0.1 502 0x80000005 0xae57 Network 0.0.0.0 140.10.0.97 140.10.0.1 522 0x80000001 0xefa4 Network 0.0.0.0 140.10.0.101 140.10.0.1 537 0x80000001 0x7523 -----------------------------------------------------------------No. of LSAs: 5 ================================================================== *B:PE1>config>router>ospf#
6a. what type of LSAs are in the database 6b. Is the database consistent on all routers Is the database identical on all routers 7. The previous command only showed a summary of each LSA. Use the detail option at the end of the command to see the full LSA information.
*B:PE1# show router ospf database detail [... OR ...] *B:PE1 # show router ospf database 140.10.0.1 detail
8. Confirm using ping, and optionally traceroute, that each router can reach every interface configured in OSPF on every other router. Note that the loopbacks have not been configured in OSPF and therefore should not be reachable from remote routers. If any interface isn t reachable, double-check that you have correctly configured that interface into OSPF.
C H A P T E R 9 : OPE N SHO RT E S T PAT H F I R S T (O SPF )
9. we will use loopback interfaces to demonstrate how to distribute external or static routes into OSPF. To enable a router to distribute external routes, it must be identified as an Autonomous System Border Router (ASBR). Each router will distribute its loopback interface, so make each router an ASBR.
*B:PE1>config>router>ospf# asbr *B:PE1>config>router>ospf#
9a. Can the ASBR designation be limited to a particular area Try issuing the asbr command within the context config router ospf area 0. 10. A routing policy defines which external routes are distributed into OSPF. It is impossible to distribute external routes without a policy. A lengthy discussion of policy implementation on the Alcatel-Lucent 7750/7450 products is a topic for an advanced course. For this exercise, please follow the commands below, which create and apply an export policy to OSPF. Repeat this process on all routers.
*B:PE1# configure router policy-options [For layout considerations, the prompt is shorted below.] >policy-options# begin >policy-options# policy-statement DistributeLB >policy-options>policy-statement$ entry 10 >policy-options>policy-statement>entry$ from protocol direct >policy-options>policy-statement>entry# action accept >policy-options>policy-statement>entry>action# exit >policy-options>policy-statement>entry# exit >policy-options>policy-statement# exit >policy-options# commit >policy-options# exit all [...The full prompt is shown again below...] *B:PE1# *B:PE1# configure router ospf *B:PE1>config>router>ospf# export DistributeLB *B:PE1>config>router>ospf#
10a. Can the export policy be assigned only to a particular area Try issuing the export command within the context config router ospf area 0. 11. Confirm using ping, and optionally traceroute, that each router can reach every interface configured in OSPF on every other router, including loopbacks. If any