HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 110
Configuring an OSPF NSSA area, Network requirements
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[SwitchC-ospf-1] quit # Display OSPF routing information on Switch C [SwitchC] display ospf routing OSPF Process 1 with Router ID 10.4.1.1 Routing Tables Routing for Network Destination Cost 0.0.0.0/0 4 10.2.1.0/24 3 10.3.1.0/24 7 10.4.1.0/24 3 10.5.1.0/24 17 10.1.1.0/24 5 Type NextHop Inter 10.2.1.1 Transit 10.2.1.2 Inter 10.2.1.1 Stub 10.4.1.1 Inter 10.2.1.1 Inter 10.2.1.1 AdvRouter 10.2.1.1 10.2.1.1 10.2.1.1 10.4.1.1 10.2.1.1 10.2.1.1 Area 0.0.0.1 0.0.0.1 0.0.0.1 0.0.0.1 0.0.0.1 0.0.0.1 Total Nets: 6 Intra Area: 2 Inter Area: 4 ASE: 0 NSSA: 0 The output shows that when Switch C resides in the stub area, a default route takes the place of the external route. # Filter Type-3 LSAs out the stub area [SwitchA] ospf [SwitchA-ospf-1] area 1 [SwitchA-ospf-1-area-0.0.0.1] stub no-summary [SwitchA-ospf-1-area-0.0.0.1] quit # Display OSPF routing information on Switch C. [SwitchC] display ospf routing OSPF Process 1 with Router ID 10.4.1.1 Routing Tables Routing for Network Destination Cost 0.0.0.0/0 4 10.2.1.0/24 3 10.4.1.0/24 3 Type NextHop Inter 10.2.1.1 Transit 10.2.1.2 Stub 10.4.1.1 AdvRouter 10.2.1.1 10.4.1.1 10.4.1.1 Area 0.0.0.1 0.0.0.1 0.0.0.1 Total Nets: 3 Intra Area: 2 Inter Area: 1 ASE: 0 NSSA: 0 After this configuration, routing entries on the stub router are further reduced, containing only one default external route. Configuring an OSPF NSSA area Network requirements Figure 37 shows an AS is split into three areas, where all switches run OSPF. Switch A and Switch B act as ABRs to forward routing information between areas. 100
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