Using route tags to control route filtering

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Experimental Steps and Requirements:

1. Configure the IP addresses of each router and use the ping command to confirm connectivity

2. Configure R2,R3 routing bidirectional re-release

R2 (config) #router OSPF 10

R2 (config-router) #redistribute EIGRP subnets

R2 (config) #router EIGRP 10

R2 (config-router) #redistribute OSPF metric 10000 100 255 1 1500

R3 (config) #router rip

R3 (config-router) #redistribute OSPF 3 metric

R3 (config) #router OSPF 10

R3 (config-router) #redistribute RIP subnets

3. Check The routing table of the R4 to confirm the routing re-release

R4#sho IP route

Gateway of LastResort is not set

10.0.0.0/30 is subnetted, 2 subnets

R 10.1.1.0 [120/3] via 172.16.1.1,00:00:13, serial1/0 by re-releasing the learned non-

R 10.1.1.4 [120/3] via 172.16.1.1,00:00:13, serial1/0 RIP Zone Routing

172.16.0.0/16 is variably subnetted, 2subnets, 2 masks

C 172.16.1.0/24 is directly connected,serial1/0

L 172.16.1.2/32 is directly connected,serial1/0

R 192.168.0.0/24 [120/3] via 172.16.1.1,00:00:13, serial1/0

R 192.168.1.0/24 [120/3] via 172.16.1.1,00:00:13, serial1/0

R 192.168.2.0/24 [120/3] via 172.16.1.1,00:00:13, serial1/0

R 192.168.3.0/24 [120/3] via 172.16.1.1,00:00:13, serial1/0

4. According to topology configuration, 192.168.0.0/24 and 192.168.2.0/24 or route-map< Span style= "font-size:11px;font-family: ' Microsoft Jacob Black ', Sans-serif;" > configuration can be either real   current route filtering, or route filtering can be implemented by configuring route tags.

5. filtering using route markers is divided into two steps: one . server-side router configuration flags two . client routers are filtered based on tags

6. Configure allocation route flags on R2

R2 (config) #access-list 1 Permit 192.168.0.0 0.0.0.255 use ACLs to Mark

R2 (config) #access-list 1 Permit 192.168.2.0 0.0.0.255 Route

R2 (config) #route-map Settag Permit 10

R2 (config-route-map) #match IP address 1

R2 (config-route-map) #set tag 1 to match ACL 1 The route entry assignment is marked as 1

R2 (Config-route-map) #exit

R2 (config) #route-map Settag Permit 20

R2 (Config-route-map) #exit

R2 (config) #routerospf 10

R2 (config-router) #redistribute EIGRP subnets Route-map Settag

In Route re-release is the call route, which marks the embedding

7. on R3 , configure Route-map to route filtering via tags

R3 (config) #route-map Matchtag deny 10

R3 (config-route-map) #match tag 1 for tags marked as 1 routing, filtering processing

R3 (Config-route-map) #exit

R3 (config) #route-map matchtag Permit unconditional forwarding of other routes

R3 (Config-route-map) #exit

R3 (config) #routerrip

R3 (config-router) #redistribute OSPF metric 3 route-map Matchtag The call route map is filtered when routing is republished.

8. Check The routing table of the R4 to confirm the route filtering

R4#sho IP route

Gateway of LastResort is not set

10.0.0.0/30 is subnetted, 2 subnets

R 10.1.1.0 [120/3] via 172.16.1.1,00:00:16, serial1/0

R 10.1.1.4 [120/3] via 172.16.1.1,00:00:16, serial1/0

172.16.0.0/16 is variably subnetted, 2subnets, 2 masks

C 172.16.1.0/24 is directly connected,serial1/0

L 172.16.1.2/32 is directly connected,serial1/0

R 192.168.1.0/24 [120/3] via 172.16.1.1,00:00:16, serial1/0 R4 The routing table shows the success of routing filtering

R 192.168.3.0/24 [120/3] via 172.16.1.1,00:00:16, serial1/0

9. routing tags can be easily pre-categorized, the client only needs simple matching tags without the need to write a large number of ACLs to identify the route, through this configuration, can effectively maintain network routing updates.

Using route tags to control route filtering