Typical Configuration Of OSPF Area Route Summary on AR28、AR46 Series Routers

Typical Configuration Of OSPF Area Route Summary on AR28、AR46 Series Routers

[Requirements]

In an OSPF AS, Routers A and B run in area 0; Routers B and C run in area 1; Router B serves as the ABR.

Two Ethernet interfaces of Router C are located in area 1, respectively belonging to 40.1.1.0/24 and 40.1.2.0/24 network segments.

It is required to perform route summary on ABR Router B to summarize the above two segments to 40.1.0.0/16.

[Networking diagram]

[Configuration script]

Configuration script on Router A

# sysname RouterA # router id 1.1.1.1 # radius scheme system # domain system # interface Ethernet0/0 ip address 10.1.1.1 255.255.255.0 # interface Serial0/0 link-protocol ppp ip address 20.1.1.1 255.255.255.252 # interface NULL0 # interface LoopBack0 ip address 1.1.1.1 255.255.255.255 # ospf 1 area 0.0.0.0 network 1.1.1.1 0.0.0.0 network 10.1.1.0 0.0.0.255 network 20.1.1.0 0.0.0.3 # user-interface con 0 user-interface vty 0 4 # return

Configuration script on Router B

# sysname RouterB # router id 1.1.1.2 # radius scheme system # domain system # interface Seria0/0 link-protocol ppp ip address 20.1.1.2 255.255.255.252 # interface Serial0/1 link-protocol ppp ip address 30.1.1.1 255.255.255.252 # interface NULL0 # interface LoopBack0 ip address 1.1.1.2 255.255.255.255 # ospf 1 area 0.0.0.1 network 30.1.1.0 0.0.0.3 abr-summary 40.1.0.0 255.255.0.0 advertise       /Configure route summary for the area/ # area 0.0.0.0 network 1.1.1.2 0.0.0.0 network 20.1.1.0 0.0.0.3 # user-interface con 0 user-interface vty 0 4 # return

Configuration script on Router C

# sysname RouterC # router id 1.1.1.3 # radius scheme system # domain system # interface Ethernet0/0 ip address 40.1.1.1 255.255.255.0 # interface Ethernet0/1 ip address 40.1.2.1 255.255.255.0 # interface Serial0/0 link-protocol ppp ip address 30.1.1.2 255.255.255.252 # interface NULL0 # interface LoopBack0 ip address 1.1.1.3 255.255.255.255 # ospf 1 area 0.0.0.1 network 1.1.1.3 0.0.0.0 network 30.1.1.0 0.0.0.3 network 40.1.1.0 0.0.0.255 network 40.1.2.0 0.0.0.255 # user-interface con 0 user-interface vty 0 4 # return

 

[Verification]

Routers can learn the routes of the whole network through OSPF, and their network segments can be pinged mutually.

Routing table of Router A:

<RouterA>disp ip routing-table

Routing Table: public net

Destination/Mask   Protocol Pre  Cost        Nexthop         Interface

1.1.1.1/32         DIRECT   0    0           127.0.0.1       InLoopBack0

1.1.1.2/32         OSPF     10   1563        20.1.1.2        Serial0/0

1.1.1.3/32         OSPF     10   3125        20.1.1.2        Serial0/0

10.1.1.0/24        DIRECT   0    0           10.1.1.1        Ethernet0/0

10.1.1.1/32        DIRECT   0    0           127.0.0.1       InLoopBack0

20.1.1.0/30        DIRECT   0    0           20.1.1.1        Serial0/0

20.1.1.1/32        DIRECT   0    0           127.0.0.1       InLoopBack0

20.1.1.2/32        DIRECT   0    0           20.1.1.2        Serial0/0

30.1.1.0/30        OSPF     10   3124        20.1.1.2        Serial0/0

40.1.0.0/16        OSPF     10   3125        20.1.1.2        Serial0/0

127.0.0.0/8        DIRECT   0    0           127.0.0.1       InLoopBack0

127.0.0.1/32       DIRECT   0    0           127.0.0.1       InLoopBack0

[Tip]

1. Route summary can be configured on the ABR only.

2. Route summary also proposes requirements for the networking: Try to make the network segments in the same non-backbone area summarized continuously. Otherwise, the maintenance will become more difficult after network expansion.