2. DECENTRALISING UNDER PRESSURE: THE SPANISH
2.2 Research design
Technologies Covered
Stub area
Totally not so stubby area
NSSA
NSSA type 5 to type 7 translation
LSA filtering
FA Suppression
Reliable conditional default routing
Overview
The knowledge of implementation OSPF Area Types is critical for this lab. You have to know the differences between the Stub/Total Stub/NSSA areas and how they affect redistribution in general. Other features, like LSA Filtering, FA Suppression and Reliable Conditional Default Routing are also part of this lab.
Estimated Time to Complete: 4 hours
iPexpert’s Recommended Reading Material
How OSPF Injects a Default Route into a Normal Area:
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/47868-ospfdb9.html
How OSPF Injects a Default Route into a Stub or Totally Stub Area:
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/47869-ospfdb10.html
How OSPF Injects a Default Route into a Not So Stubby Area:
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/47870-ospfdb11.html
How does OSPFgenerate Default Routes:
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13692-21.html
OSPF Commands & Features:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/command/iro-cr-book.html
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iPexpert’s Recommended Video Training
iPexpert’s Video on Demand training library contains a wealth of videos pertaining to the CCIE Routing & Switching lab exam. We recommend watching the following learning videos which cover the topics seen in this lab scenario.
Video Title: OSPF Area Types
Video Title: OSPF Summarization and Filtering
Video Title: OSPF LSA Types 4,5, and 7
Video Title: OSPF Advanced Configuration and Filtering
Video Title: OSPF Stub Area Configurations
Video Title: OSPF Inter-Area and External Routes in the Database
Video Title: OSPF Forward Address
Topology Details
Logically connect and configure your network as displayed in the drawing below. You may also refer to the diagram located within your configuration files for topology information.
The topology used in the lab will be the following:
Diagram 16.1: OSPF Topology
Lab 16 Setup
This lab is intended to be used with online rack access. Connect to the terminal server for the online rack, and complete the configuration tasks as detailed below.
NOTE
Load the initial configuration files before starting to work on the tasks.
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Configuration Tasks
1. R1, R2, and R3 are in a hub and spoke topology where R1 is the hub and R2 and R3 are the spokes. DMVPN is the underlying used technology. Get OSPF routing up and routing with process 1 area 0 in this DMVPN network. The election of a DR should not take place in this network. Do not modify any OSPF timers.
2. Add the loopback0 of R1, R2, and R3 into the area 0 process as network statements.
3. On R2, R3, and R6, configure the network 10.1.236.0/24 as part of OSPF area 236. Add the loopback0 of R6 into the area 236 process as a network statement.
4. In the R6 routing-table, the only IA OSPF-learned route should be a default route with the ABRs as the next-hop.
5. On R6, configure static routing to ensure the reachability of the loopback0, loopback1, and loopback2 networks of R9. R9 should be configured with a default route.
6. On R6, redistribute the static routes configured in Task 5 (except loopback2) into OSPF. In the routing-table of R1, 10.1.9.0/24 should show as E1 and 10.11.9.0/24 should show as E2. On R1, ensure that you can ping the loopback0 and loopback1 of R9 from the loopback0 of R1 as a source.
7. Area 236 is a totally Not-so-stub area having two ABRs to area 0. By manipulating OSPF cost, ensure that the default route in the R6 routing table is using R3 as a next hop. The cost of the default route to R2 should be modified and this cost should be the default cost +1.
8. On R1 and R4, configure the network 10.1.14.0/24 as part of OSPF area 14. Add loopback0 of R4 into the area 14 process as a network statement.
9. Configure Area 14 in a way that it does not receive any LSA 5 updates. Ensure full reachability and test that you can ping from R4 the loopback 0 of R9 from the loopback 0 of R4 as a source.
10. Area 35 is a totally NSSA area. On R3 and R5, configure the network 10.1.35.0/24 as part of OSPF area 35. Inject the loopback0 of R5 into the area 35 process as a network statement.
11. Redistribute loopback1, loopback2, loopback3, and loopback4 of R5 into the area 35 each as a N2 route and each with a metric of 55. Make sure that on R5, you can ping to the loopback0 of R9 with the ping sourcing from loopback 4 of R5.
12. Block the LSA 7 to LSA 5 translation for the network 10.11.5.0/24 using a summary-address command.
13. Filter the forwarding address for the type-7 LSAs originated at R5 using the area 35 range not-advertise in command on the ABR.
restored, that is to say check that you can ping to the loopback0 of R9 with the ping using as a source the loopback4 of R5.
15. On R1, there is a default route pre-configured. This default route should be redistributed into OSPF only if the network 10.21.5.0/24 is present in the routing table of R1. Use IP SLA to track, in a reliable way, this network. You are allowed to add one static route in this task.
Helpful Verification Commands
Show ip protocols
Show ip ospf
Show ip ospf database
Show ip ospf interface
Show ip ospf neighbor
Show ip ospf border-routers
Technical Verification and Support
To verify your configurations please ensure that you have downloaded the latest “final configurations” from within the iPexpert Member’s Area.
You may also verify your configurations and obtain a detailed overview of why specific commands were used within the accompanying Detailed Solution Guide.
For instructor and developer support, please be sure to submit questions through our interactive support community that’s accessible from the Member’s Area.
This concludes Lab 16 of iPexpert's CCIE Routing & Switching Workbook, Volume 1, Section 2 Copyright© iPexpert. All Rights Reserved.
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