OSPF configuration special area Total Stub
OSPF routing protocol is a typical link-state (Link-state) routing protocol, generally used in the same routing domain. In one area, only one OSPF backbone area, there may be a plurality of regions of non-backbone, the backbone area of the region number 0. Between non-backbone area is not the exchange of information, they are only connected to the backbone area, to exchange information with each other via the backbone area. Routing is connected between the non-backbone areas and backbone area called border routes. It totally peripheral area from the routing protocol redistribution between OSPF routing entry to the area and learning to replace all of the routing default route to the backbone area. Backbone area and divided into non-backbone areas and greatly reduce the burden of work in the area of the route.
(1) is completely distal tip region is a region of a more economical, it does not accept the type 3 (Summary LSA), 4 (Summary ASB LSA), 5 (External LSA) of the LSA, the router will use the information destined for external 0.0.0.0 default route sent out.
(2) five common LAS:
1.Router LSA、
2.Network LSA、
3.Summary LSA、
4.Summary ASB LSA、
5.External LSA
(3)Router LSA：
Not only in the region propagating through the ABR (ABR);
Each router belonging to a region are based on a region-based advertisement 1 LSA.
First, the experiment name
OSPF special areas arranged Toal STUB
Second, the intellectual preparation
(1) mastered the principle of OSPF dynamic routing.
(2) mastered the concepts, classifications and special purpose OSPF special areas.
Second, the purpose of the experiment
1, the basic configuration master router special area OSPF STUB area.
Fourth, the experiment content
1, the basic configuration ZTE Toal STUB area OSPF router 1800 a special area and verification results.
Fifth, experiment
(1) experimental mission statement
1, the router R1, R2, running OSPF protocol R3, and the R1 is loopback1 and gei-2/6 interfaces divided Area 0, and the remaining interface selection redistribution network, R2 is loopback1 and gei-2/6 divided area area 0, gei-2/5 divided region area, and the R3 is loopback1 gei-2/5 divided region area.
2, to modify the IP address of PC1, to verify connectivity.
3, see the router's routing table, neighbors, and port information OSPF database.
4, modify the Area 1 region as a Special Area --TOAL STUB (totally stubby area), view the routing table, routing table changes observed to explore the reasons for changes in the routing table.
(2) service configuration flowchart
3, experiment configuration
1 , the basic configuration of the router R1
2 , the basic configuration of the router R2
3, the basic configuration of the router R3
(3) Configuration special area
R1 router configuration:
R2 router configuration:
R3 router configuration:
(4) review and verification
Routing table comparison
R1 :
Before modification:
after modification:
R2 :
Before modifying
after modification:
R3 - :
Before modification:
after modification:
Routing table changes:
1 , R3 routing table 10.31.1.1,10.31.1.2,10.31.2.0,10.31.3.0 routes disappear, add a default route 0.0.0.0
2 , the newly added default routing cost of 2.
Reasons for the change:
Complete peripheral role is: do not accept Type 3 (Summary LSA), 4 (Summary ASB LSA), 5 (External LSA) of the LSA, and the router will use the information destined for the external default route 0.0.0.0 transmitted. So 10.21.1.1,10.21.1.2,10.21.2.0,10.21.3.0 four road outside the local autonomous system destined to disappear by the information, add a default route, the router within the autonomous system via the default route to access external router.