Build a stable OSPF campus network

Lab Name: Building a Stable OSPF Campus Network Lab Topology: (Unified Topology Graph) Lab Requirements:

1. If shown, interface IP addresses are configured and there is a loopback 0 on each router,

IP address: 10.10.x.x/24 , X is the number of each router; for example, loopback 0 of R1 is 10.10.1.1/24;

2. If shown, plan the OSPF network area to ensure network-wide interoperability;

3. OSPF area 80, the OSPF process number used by each router is ospf 80 ; other routers have no explicit restrictions.

4. Route entries for Area 80, in other OSPF common areas, exist as OSPF external routes;

[Need to import OSPF 80 into OSPF 1 on R7;(mutual import)]

【ospf 1: import-route ospf 80】

【ospf 80 : import-route ospf 1 】

5. protect zones 156, 112 and 137 from adverse effects caused by unstable links in zone 80;

At the same time, region 112 cannot be affected by unstable links in other general regions

[Configure area 156/112/137 as special area-stub]

[At the same time, you have to configure Area 112 as totally stub]

【R11/12, ospf 1 -> area 112 -> stub】

【R2，ospf 1 --> area 112 --> stub no-summary】

【R13/7, ospf1 -> area 137 --> stub 】

【R1/R5/R6，ospf 1 --> area 156 --> stub】

6. Ensure that routers in Area 69 interoperate with other OSPF areas;

[Import routes from Area 69 into OSPF Area 156]

[Because area 156 is a special area, this area does not support the establishment of virtual links]

[Therefore, we can only talk about the route of Area 69, which is introduced in the form of an external route.]

[First delete the previous configuration related to the stub in area 156]

【R1/R5/R6，ospf 1 --> area 156 --> nssa】

Create two OSPF processes on R6, such as OSPF 69 between R6 and R9

Between R6 and R5, OSPF process 1 is used.

【ospf 1 -> import-route ospf 69】

【ospf 69 --> import-route ospf 1 】

7. Ensure that Area 137 intercommunicates with other areas and that R13 learns the internal route of OSPF.

[That is, the routes in the other areas seen in Area 137 are required to be represented in the form of Type 3 LSAs]

So, in region 137, we have to interconnect it with region 0.

[Therefore, on R7, traverse region 47 and establish a virtual link with R4]

【R4,ospf 1 -> area 47 -> vlink-peer 7.7.7.7】

【R7,ospf 1 -> area 47 -> vlink-peer 4.4.4.4】

8. Ensure that OSPF's regular area routers access Loopback 0 on R8 and R10,

The route entry used is 10.10.0.0/16,

Not 10.10.8.0/24 and www.example.com. 10.10.10.0/24

[Examined is a summary of OSPF's five types of LSA]

[Configure on ASBR that generates detailed routes]

【R7,ospf 1 -> asbr-summary 10.10.0.0 255.255.0.0】

9. Ensure that routers in Area 0 establish OSPF neighbors quickly and that no Type 2 LSAs occur;

[Change the network type of all interconnection links in zone 0 to p2p]

【interface gi0/0/x --> ospf network-type p2p】

10. Ensure that in region 47, R4 must always be DR and that there is no BDR;

[Examining the election principles of OSPF DR]

【DR/BDR/DRother】

【R7:interface gi0/0/1 --> ospf dr-priority 0】

Lab steps: (OSI model)

1. Equipment interconnection, and power-on start;

2. Configure a Layer 2 switched network (not available for this topology, do not consider)

3. Configure the interconnect IP address of the interface;

4. Configuration Routing Protocol (OSPF)

backbone area

nonbackbone areas

normal domain

special area