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

1. Totally stub analysis of special area

Zone type function default route remarks commands stub filter LSA4, LSA5ABR default issue three types of default routes, seed cost value is 1 all routers in this area must be configured as stub, otherwise neighbors can not get up and cannot contain ASBR

Area 2 stub

Area 2 default-cost x

Totally stub filters three types of default routes issued by LSA3, LSA4 and LSA5ABR by default. The seed cost value is 1. All routers in this area must be configured as stub, otherwise neighbors cannot get up and cannot contain ASBRarea 2 stub no-summary.

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 LSA3, LSA4, LSA4

Before configuring totally stub

After configuring totally stub

ABR devolves three types of default routes

Before configuring totally stub

After configuring totally stub

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