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This chapter is from the book 

This chapter is from the book

CCNP Routing and Switching Portable Command GuideCCNP Routing and Switching Portable Command Guide

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This chapter is from the book

This chapter is from the book 

CCNP Routing and Switching Portable Command GuideCCNP Routing and Switching Portable Command Guide

Learn More Buy

Using Route Maps with Route Redistribution

Router(config)#route-map MY_MAP permit 10

Creates a route map called MY_MAP. This route-map statement will permit redistribution based on subsequent criteria. A sequence number of 10 is assigned.

Router(config-route-map)#match ip address 5

Specifies the match criteria (the conditions that should be tested); in this case, match addresses filtered using a standard access list number 5.

Router(config-route-map)#set metric 500

Specifies the set action (what action is to be performed if the match criteria is met); in this case, set the external metric to 500 (instead of the default value of 20).

Router(config-route-map)#set metric-type type-1

Specifies a second set action for the same match criteria. In this case, set the external OSPF network type to E1.

Router(config-route-map)#route-map MY_MAP deny 20

Adds a second statement to the MY_MAP route map that will deny redistribution based on subsequent criteria.

Router(config-route-map)#match ip address prefix-list MY_PFL

Specifies the match criteria (the conditions that should be tested); in this case, match addresses filtered using a prefix list named MY_PFL.

Router(config-route-map)#route-map MY_MAP permit 30

Adds a third statement to the MY_MAP route map that will permit redistribution based on subsequent criteria.

NOTE: No β€œmatch” criteria are explicitly specified; all other routes will be redistributed with the following β€œset” criteria applied.

Router(config-route-map)#set metric 5000

Specifies the set action (what action is to be performed if the match criteria is met); in this case, set the external metric to 5000 (instead of the default value of 20)

Router(config-route-map)#set metric-type type 2

Specifies a second set action for the same match criteria; in this case, set the external OSPF network type to E2. This is optional since the default type for redistributed routes into OSPF is external type 2.

Router(config-route-map)#router ospf 10

Enters OSPF process ID 10 routing process.

Router(config-router)#redistribute eigrp 1 route-map MY_MAP subnets

Redistributes only EIGRP routes that are permitted by route map MY_MAP into OSPF.

NOTE

When used to filter redistribution, route map permit or deny statements determine whether the route will be redistributed. Routes without a match will not be redistributed. The route map stops processing at the first match (similar to an access list or prefix list). There is always an implicit deny statement at the end of a route map.

Configuration Example: Route Maps

Figure 4-8 shows the network topology for the configuration that follows, which demonstrates how to control redistribution with a route map using the commands covered in this chapter. Assume that all basic configurations and EIGRP and OSPF routing have been configured correctly.

Figure 4-8

Figure 4-8 Network Topology for Route Map Configuration

The objective is to only redistribute networks 172.16.1.0/24 and 172.16.2.0/24 into OSPF and advertise them as external type 1 (E1) routes with an external metric of 50.

HULL(config)#access-list 5 permit 172.16.1.0 0.0.0.255

Creates a standard ACL number 5 and explicitly permits the 172.16.1.0/24 network.

HULL (config)#access-list 5 permit 172.16.2.0 0.0.0.255

Adds a second line to ACL 5 that explicitly permits the 172.16.2.0/24 network.

HULL(config)#route-map FILTER permit 10

Creates a route map called FILTER. This route map will permit traffic based on subsequent criteria. A sequence number of 10 is assigned.

HULL(config-route-map)#match ip address 5

Specifies the match criteria; match addresses filtered from ACL 5.

HULL(config-route-map)#set metric 50

HULL(config-route-map)#set metric-type type-1

Specifies the set actions (what actions are to be performed if the match criterion is met); in this case, sets the external metric to 50 and sets the type to external type 1 (E1).

HULL(config)#router ospf 1

Enters OSPF process ID 1 routing process.

HULL(config)#redistribute eigrp 10 subnets route-map FILTER

Redistributes only those EIGRP networks into OSPF which match the route map.

NOTE: Networks 172.16.2.0/24 and 172.16.3.0/24 will not be redistributed because of the implicit deny any at the end of the route map.

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