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

1. Prefix list prefix-list parsing

2.2.2.0/24

2.2.2.0/25

2.2.2.0/26

ACL can only control the network number, not the mask

Access-list 1 permit 2.2.2.0 0.0.0.255

This ACL does not exactly match 2.2.2.0 Universe 24 2.2.2.0 Universe 25 and 2.2.2.0 Universe 26 are also included because their network numbers are the same.

Prefix-List can control both the network number and the mask

2.2.2.0/26

Ip prefix-list 1 permit 2.2.2.0 Compact 24 (Network number: 2.2.2.0 Mask: 24 bits)

Ip prefix-list 1 permit 2.2.2.0 ip prefix-list 24 le 32 (Network number: 2.2.2.0 Mask: 24-32 bits)

Ip prefix-list 1 permit 2.2.2.0 ge 24 ge 26 (network number: 2.2.2.0 mask: 26-32 bits)

Ip prefix-list 1 permit 2.2.2.0 ge 24 ge 26 le 30 (Network number: 2.2.2.0 Mask: 24-30 digits)

Ip prefix-list 1 permit 0.0.0.0amp 0 le 32 (permit any)

Prefix-list executes from top to bottom, default deny any

ACL can grab packets and routes, and can be applied to interfaces and routing processes. Prefix-List can only grasp routes and can only be used in routing processes.

2. Experimental topology

3. Experimental configuration

R1 configuration

Interface Serial0/0

Ip address 12.1.1.1 255.255.255.0

Interface Serial0/1

Ip address 13.1.1.1 255.255.255.0

Interface Serial0/2

Ip address 14.1.1.1 255.255.255.0

Router eigrp 90

Redistribute ospf 110 metric 1500 100 255 1 1500

Network 14.1.1.0 0.0.0.255

No auto-summary

Router ospf 110

Router-id 1.1.1.1

Log-adjacency-changes

Redistribute rip subnets

Network 13.1.1.0 0.0.0.255 area 0

Router rip

Version 2

Network 12.0.0.0

No auto-summary

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

Router rip

Version 2

Network 2.0.0.0

Network 12.0.0.0

No auto-summary

R3 configuration

Interface Loopback0

Ip address 3.3.3.3 255.255.255.0

Interface Serial0/0

Ip address 13.1.1.3 255.255.255.0

Router ospf 110

Router-id 3.3.3.3

Log-adjacency-changes

Network 3.3.3.0 0.0.0.255 area 0

Network 13.1.1.0 0.0.0.255 area 0

R4 configuration

Interface Loopback0

Ip address 4.4.4.4 255.255.255.0

Interface Serial0/0

Ip address 14.1.1.4 255.255.255.0

Router eigrp 90

Network 4.4.4.0 0.0.0.255

Network 14.1.1.0 0.0.0.255

No auto-summary

4. Prefix list application

At this point, we can see that R4 can learn 3.3.3.3Universe 32 and 13.1.1.0Universe 24, and here we hope to let R4 learn only 3.3.3.3Universe 32 through the distribution list.

R1 configuration

Ip prefix-list 1 permit 3.3.3.3/32

Router eigrp 90

Distribute-list prefix 1 out ospf 110

At this point, R4 only learns the route 3.3.3.3tick 32.

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