Shulou(Shulou.com)06/01 Report--

1. Stub analysis of special area

Whether to issue default routes stub filter LSA4 and LSA5ABR default. The seed cost value is 1. All routers in this area must be configured as stub, otherwise neighbors cannot play and cannot contain ASBR.

2. Experimental topology

3. Experimental configuration

R1 configuration

Interface Loopback0

Ip address 1.1.1.1 255.255.255.0

Interface Serial0/0

Ip address 12.1.1.1 255.255.255.0

Router ospf 110

Router-id 1.1.1.1

Network 12.1.1.0 0.0.0.255 area 2

R2 configuration

Interface Loopback0

Ip address 2.2.2.2 255.255.255.0

Interface Serial0/0

Ip address 12.1.1.2 255.255.255.0

Interface Serial0/1

Ip address 23.1.1.2 255.255.255.0router ospf 110

Router-id 2.2.2.2

Network 12.1.1.0 0.0.0.255 area 2

Network 23.1.1.0 0.0.0.255 area 0

R3 configuration

Interface Loopback0

Ip address 3.3.3.3 255.255.255.0

Interface Serial0/0

Ip address 34.1.1.3 255.255.255.0

Interface Serial0/1

Ip address 23.1.1.3 255.255.255.0router ospf 110

Router-id 3.3.3.3

Network 23.1.1.0 0.0.0.255 area 0

Network 34.1.1.0 0.0.0.255 area 1

R4 configuration

Interface Loopback0

Ip address 4.4.4.4 255.255.255.0

Interface Serial0/0

Ip address 34.1.1.4 255.255.255.0

Interface Serial0/1

Ip address 45.1.1.4 255.255.255.0

Router ospf 110

Router-id 4.4.4.4

Redistribute rip subnets

Network 34.1.1.0 0.0.0.255 area 1

R5 configuration

Interface Loopback0

Ip address 5.5.5.5 255.255.255.0

Interface Serial0/1

Ip address 45.1.1.5 255.255.255.0

Serial restart-delay 0

Router rip

Version 2

Network 5.0.0.0

Network 45.0.0.0

No auto-summary

4. Experimental verification.

Filter LSA4, LSA4

Before configuring stub

After configuring stub

ABR devolves three types of default routes

5. Modify the redistributed cost value. The default value is 1.

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