Filtering LSA (1) of Type 3 on the ABR in OSPF Environment)

Filter the LSA-topology of Type 3 on the abr in the ospf Environment

LSA-requirement for filtering Type 3 in the OSPF Environment

Start OSPF on two routers, and make the frame relay interface participate in Area 0. Add three loopback interfaces on each router, loop0, loop1, and loop2, three loopback interfaces of R1 participate in ospf region 1, and three loopback interfaces of R2 participate in ospf Region 2.

Filtering LSA-configuration process of Type 3 in the OSPF Environment

 
 

  
  
R1(config)#interface s 0  
  
  
R1(config-if)#encasulation frame-relay  
  
  
R1(config-if)#no frame-relay inverse  
  
  
R1(config-if)#no arp frame-relay  
  
  
R1(config-if)#ip address 10.1.1.1 255.255.255.0  
  
  
R1(config-if)#frame-relay map ip 10.1.1.2 102 broadcast  
  
  
R1(config-if)#no shutdown  
  
  
R1(config)#interface loop0  
  
  
R1(config-if)#ip address 192.168.1.1 255.255.255.0  
  
  
R1(config-if)#ip ospf network point-to-point  
  
  
R1(config-if)#interface loop1  
  
  
R1(config-if)#ip address 192.168.2.1 255.255.255.0  
  
  
R1(config-if)#ip ospf network point-to-point  
  
  
R1(config-if)#interface loop2  
  
  
R1(config-if)#ip address 192.168.3.1 255.255.255.0  
  
  
R1(config-if)#ip ospf network point-to-point  
  
  
 
  
  
R2(config)#interface s 0  
  
  
R2(config-if)#encasulation frame-relay  
  
  
R2(config-if)#no frame-relay inverse  
  
  
R2(config-if)#no arp frame-relay  
  
  
R2(config-if)#ip address 10.1.1.2 255.255.255.0  
  
  
R2(config-if)#frame-relay map ip 10.1.1.1 201 broadcast  
  
  
R2(config-if)#no shutdown  
  
  
R2(config)#interface loop0  
  
  
R2(config-if)#ip address 192.168.4.2 255.255.255.0  
  
  
R2(config-if)#ip ospf network point-to-point  
  
  
R2(config)#interface loop1  
  
  
R2(config-if)#ip address 192.168.5.2 255.255.255.0  
  
  
R2(config-if)#ip ospf network point-to-point  
  
  
R2(config)#interface loop2  
  
  
R2(config-if)#ip address 192.168.6.2 255.255.255.0  
  
  
R2(config-if)#ip ospf network point-to-point  
  
  
 
  
  
R1(config)#router ospf 1  
  
  
R1(config-router)#network 10.1.1.1 0.0.0.0 area 0  
  
  
R1(config-router)#neighbor 10.1.1.2  
  
  
R1(config-router)#network 192.168.1.1 0.0.0.0 area 1  
  
  
R1(config-router)#network 192.168.2.1 0.0.0.0 area 1  
  
  
R1(config-router)#network 192.168.3.1 0.0.0.0 area 1  
  
  
 
  
  
R2(config)#router ospf 1  
  
  
R2(config-router)#network 10.1.1.2 0.0.0.0 area 0  
  
  
R2(config-router)#network 192.168.4.2 0.0.0.0 area 2  
  
  
R2(config-router)#network 192.168.5.2 0.0.0.0 area 2  
  
  
R2(config-router)#network 192.168.6.2 0.0.0.0 area 2  
  
  
 
  
  
R1(config)#ip prefix-list lsa3in permit 192.168.4.0/24  
  
  
R1(config)#ip prefix-list lsa3out permit 192.168.1.0/24  
  
  
R1(config)#router ospf 1  
  
  
R1(config-router)#area 1 filter-list prefix lsa3in in  
  
  
R1(config-router)#area 0 filter-list prefix lsa3in in  
  
  
R1(config-router)#area 1 filter-list prefix lsa3out out 
 
 

Filtering LSA 2 of Type 3 on the ABR in OSPF environment)

Filtering LSA 3 of Type 3 on the abr in the ospf environment)

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