35. Redistribution configuration experiment before the prefix list prefix-list

1. prefix-list Parsing of prefix list

2.2.2.0/24

2.2.2.0/25

2.2.2.0/26

ACL can only control network number, cannot control mask

Access-list 1 Permit 2.2.2.0 0.0.0.255

This ACL does not match exactly to 2.2.2.0/24,2.2.2.0/25 and 2.2.2.0/26 are also included because their network number is the same.

Prefix-list can either control the network number or control the mask

2.2.2.0/26

IP prefix-list 1 Permit 2.2.2.0/24(Network number: 2.2.2.0 Mask: 24-bit)

IP prefix-list 1 Permit 2.2.2.0/24 le(Network number: 2.2.2.0 Mask: 24-32-bit)

IP prefix-list 1 Permit 2.2.2.0/24 GE(network number: 2.2.2.0 Mask: 26-32-bit)

IP prefix-list 1 Permit 2.2.2.0/24 ge + le(Network number: 2.2.2.0 Mask: 24-30-bit)

IP prefix-list 1 Permit 0.0.0.0/0 le(permit any)

Prefix-list from top down, default deny any

ACLs can catch packets and routes, can be applied to interfaces and routing processes, and prefix-list can only catch routes under the routing process

2. Experimental topology

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3. Experiment 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 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

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R1 Configuration

IP prefix-list 1 Permit 3.3.3.3/32

Router EIGRP 90

Distribute-list prefix 1 out OSPF 110

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At this point R4 only learned the 3.3.3.3/32 route.

This article is from the "Open Source Hall" blog, please be sure to keep this source http://kaiyuandiantang.blog.51cto.com/10699754/1719578

35, Redistribution Configuration experiment before the prefix list prefix-list