4-59[SwitchB-ospf-1] asbr-summary 10.0.0.0 8# Display the OSPF routing table of Switch A.[SwitchA] display ip routing-tableRouting Tables: PublicDestinations : 5 Routes : 5Destination/Mask Proto Pre Cost NextHop Interface10.0.0.0/8 O_ASE 150 2 11.2.1.1 Vlan10011.2.1.0/24 Direct 0 0 11.2.1.2 Vlan10011.2.1.2/32 Direct 0 0 127.0.0.1 InLoop0127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0The output shows that routes 10.1.1.0/24, 10.2.1.0/24, 10.3.1.0/24 and 10.4.1.0/24 are summarizedinto one route 10.0.0.0/8.Configuring an OSPF Stub AreaNetwork requirementsThe following figure shows an AS is split into three areas, where all switches run OSPF. Switch A andSwitch B act as ABRs to forward routing information between areas. Switch D acts as the ASBR toredistribute routes (static routes).It is required to configure Area 1 as a Stub area, reducing LSAs to this area without affecting routereachability.Figure 4-25 Network diagram for OSPF Stub area configurationArea 0Area 1StubArea 2Switch CVlan-int10010.1.1.2/24Vlan-int10010.1.1.1/24Vlan-int30010.4.1.1/24Vlan-int20010.2.1.2/24Switch BVlan-int20010.3.1.1/24Vlan-int20010.3.1.2/24Switch AVlan-int20010.2.1.1/24Vlan-int30010.5.1.1/24 Switch DASBRConfiguration procedure1) Configure IP addresses for interfaces (omitted).2) Configure OSPF basic functions (see Configuring OSPF Basic Functions).3) Configure Switch D to redistribute static routes. system-view[SwitchD] ip route-static 3.1.2.1 24 10.5.1.2[SwitchD] ospf[SwitchD-ospf-1] import-route static[SwitchD-ospf-1] quit# Display ABR/ASBR information on Switch C. display ospf abr-asbr
