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14-6 redistribute routing-process process-id route-map route-map- nameSyntax Description:
Purpose: To control the redistribution of routes learned from another routing process into OSPF. Redistributed routes become OSPF external type 2 routes by default. The default cost or metric of a redistributed route is 1 for BGP and 20 for all other protocols. This command will redistribute classful routes into OSPF only if the subnets keyword is not used. There are three general types of classful routes:
You can use the subnets keyword to redistribute all routes. You can also use the metric, metric-type, and tag keywords. These values can also be set in the route map as shown in the examples covered in this section. Initial Cisco IOS Software Release: 10.0 Configuration Example: 1 Controlling the Routes to Be Redistributed Based on IP AddressIn Figure 14-3, Router B is receiving six routes from Router C via EIGRP. Three of the EIGRP routes are classful (5.0.0.0/8, 145.5.0.0/16, 205.5.5.0/24) and three are classless (6.0.0.0/12, 146.6.0.0/20, 206.6.6.0/28). For this example, only the classless routes will be redistributed. Before redistributing the EIGRP routes into OSPF on Router B, configure the routers as shown in the listing that follows . Figure 14-3. A Route Map Is Needed to Control Which Routes Are Redistributed into OSPF from EIGRP
Router A interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Serial0/1 ip address 10.1.1.1 255.255.255.252 clockrate 64000 ! router ospf 1 network 10.1.1.0 0.0.0.3 area 0 _______________________________________________________________________ Router B interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface Serial0 ip address 10.1.1.2 255.255.255.252 ! interface Serial 1 ip address 10.1.1.5 255.255.255.252 ! router eigrp 1 network 10.0.0.0 ! router ospf 1 network 10.1.1.0 0.0.0.3 area 0 _______________________________________________________________________ Router C interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface Loopback1 ip address 5.5.5.5 255.0.0.0 ! interface Loopback2 ip address 6.6.6.6 255.240.0.0 ! interface Loopback3 ip address 145.5.5.5 255.255.0.0 ! interface Loopback4 ip address 146.6.6.6 255.255.240.0 ! interface Loopback5 ip address 205.5.5.5 255.255.255.0 ! interface Loopback6 ip address 206.6.6.6 255.255.255.240 ! interface Serial0 ip address 10.1.1.6 255.255.255.252 ! router eigrp 1 network 5.0.0.0 network 6.0.0.0 network 10.0.0.0 network 145.5.0.0 network 146.6.0.0 network 205.5.5.0 network 206.6.6.0 no auto-summary Verify that Routers A and B have established an OSPF neighbor relationship. rtrA# show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 1 FULL/ - 00:00:36 10.1.1.2 Serial0/1 Verify that Routers B and C have formed an EIGRP neighbor relationship. rtrB# show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.1.1.6 Se1 11 00:25:42 308 2280 0 4 Verify that Router B is receiving the six EIGRP routes from Router C. rtrB# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP , EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is not set 2.0.0.0/32 is subnetted, 1 subnets C 2.2.2.2 is directly connected, Loopback0 D 205.5.5.0/24 [90/40640000] via 10.1.1.6, 00:26:25, Serial1 206.6.6.0/28 is subnetted, 1 subnets D 206.6.6.0 [90/40640000] via 10.1.1.6, 00:26:25, Serial1 D 5.0.0.0/8 [90/40640000] via 10.1.1.6, 00:26:25, Serial1 6.0.0.0/12 is subnetted, 1 subnets D 6.0.0.0 [90/40640000] via 10.1.1.6, 00:26:25, Serial1 D 145.5.0.0/16 [90/40640000] via 10.1.1.6, 00:26:25, Serial1 10.0.0.0/30 is subnetted, 2 subnets C 10.1.1.0 is directly connected, Serial0 C 10.1.1.4 is directly connected, Serial1 146.6.0.0/20 is subnetted, 1 subnets D 146.6.0.0 [90/40640000] via 10.1.1.6, 00:26:27, Serial1 Modify the configuration on Router B to redistribute only the classless EIGRP routes into OSPF. Router B router ospf 1 redistribute eigrp 1 subnets route-map control-eigrp ! access-list 1 permit 6.0.0.0 0.15.255.255 access-list 1 permit 146.6.0.0 0.0.15.255 access-list 1 permit 206.6.6.0 0.0.0.15 access-list 1 permit 10.1.1.4 0.0.0.3 route-map control-eigrp permit 10 match ip address 1 VerificationVerify that only the classless EIGRP routes have been redistributed into OSPF. rtrA# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 , E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback0 206.6.6.0/28 is subnetted, 1 subnets O E2 206.6.6.0 [110/20] via 10.1.1.2, 00:02:05, Serial0/1 6.0.0.0/12 is subnetted, 1 subnets O E2 6.0.0.0 [110/20] via 10.1.1.2, 00:02:05, Serial0/1 10.0.0.0/30 is subnetted, 1 subnets C 10.1.1.0 is directly connected, Serial0/1 146.6.0.0/20 is subnetted, 1 subnets O E2 146.6.0.0 [110/20] via 10.1.1.2, 00:02:06, Serial0/1 O E2 10.1.1.4 [110/200] via 10.1.1.2, 00:02:06, Serial0/1 Configuration Example: 2 Modifying the Metric of Redistributed Routes Using a Route MapIn the first configuration example for Figure 14-3, the EIGRP routes were redistributed into OSPF with a default metric of 20. For this example, modify the configuration on Router B to change the metric of the classful routes to 100 and the metric of the classless routes to 200. Router B router ospf 1 redistribute eigrp 1 subnets route-map control-eigrp ! access-list 1 permit 6.0.0.0 0.15.255.255 access-list 1 permit 146.6.0.0 0.0.15.255 access-list 1 permit 206.6.6.0 0.0.0.15 access-list 1 permit 10.1.1.4 0.0.0.3 route-map control-eigrp permit 10 match ip address 1 set metric 200 ! route-map control-eigrp permit 20 set metric 100 VerificationVerify that the new metric has been applied to the redistributed EIGRP routes. On Router A you can look at the IP routing table and the OSPF database. rtrA# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback0 O E2 205.5.5.0/24 [110/ 100 ] via 10.1.1.2, 00:01:53, Serial0/1 206.6.6.0/28 is subnetted, 1 subnets O E2 206.6.6.0 [110/ 200 ] via 10.1.1.2, 00:01:53, Serial0/1 O E2 5.0.0.0/8 [110/ 100 ] via 10.1.1.2, 00:01:53, Serial0/1 6.0.0.0/12 is subnetted, 1 subnets O E2 6.0.0.0 [110/ 200 ] via 10.1.1.2, 00:01:53, Serial0/1 172.16.0.0/24 is subnetted, 1 subnets C 172.16.1.0 is directly connected, Ethernet0/0 O E2 145.5.0.0/16 [110/ 100 ] via 10.1.1.2, 00:01:54, Serial0/1 10.0.0.0/30 is subnetted, 2 subnets C 10.1.1.0 is directly connected, Serial0/1 O E2 10.1.1.4 [110/ 200 ] via 10.1.1.2, 00:01:55, Serial0/1 146.6.0.0/20 is subnetted, 1 subnets O E2 146.6.0.0 [110/ 200 ] via 10.1.1.2, 00:01:55, Serial0/1 rtrA# show ip ospf database external 5.0.0.0 OSPF Router with ID (1.1.1.1) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 254 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 5.0.0.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000002 Checksum: 0x8BB6 Length: 36 Network Mask: /8 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 100 Forward Address: 0.0.0.0 External Route Tag: 0 rtrA# show ip ospf database external 206.6.6.0 OSPF Router with ID (1.1.1.1) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 297 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 206.6.6.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000003 Checksum: 0x51C4 Length: 36 Network Mask: /28 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 200 Forward Address: 0.0.0.0 External Route Tag: 0 Configuration Example: 3 Modifying the Metric Type of Redistributed Routes Using a Route MapIn Figure 14-3, configuration example 1 for the redistribute route-map command, the EIGRP routes were redistributed into OSPF with a default metric type of 2. For this example, modify the configuration on Router B to change the metric type of the classful routes to type 1. Router B router ospf 1 redistribute eigrp 1 subnets route-map control-eigrp network 10.1.1.0 0.0.0.3 area 0 ! access-list 1 permit 6.0.0.0 0.15.255.255 access-list 1 permit 146.6.0.0 0.0.15.255 access-list 1 permit 206.6.6.0 0.0.0.15 access-list 1 permit route-map control-eigrp permit 10 match ip address 1 set metric 200 ! route-map control-eigrp permit 20 set metric 100 set metric-type type-1 VerificationVerify that the classful EIGRP routes have been redistributed into OSPF as metric type 1 routes. rtrA# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets C 1.1.1.1 is directly connected, Loopback0 O E1 205.5.5.0/24 [110/1662] via 10.1.1.2, 00:01:38, Serial0/1 206.6.6.0/28 is subnetted, 1 subnets O E2 206.6.6.0 [110/200] via 10.1.1.2, 00:01:38, Serial0/1 O E1 5.0.0.0/8 [110/1662] via 10.1.1.2, 00:01:38, Serial0/1 6.0.0.0/12 is subnetted, 1 subnets O E2 6.0.0.0 [110/200] via 10.1.1.2, 00:01:38, Serial0/1 172.16.0.0/24 is subnetted, 1 subnets C 172.16.1.0 is directly connected, Ethernet0/0 O E1 145.5.0.0/16 [110/1662] via 10.1.1.2, 00:01:39, Serial0/1 10.0.0.0/30 is subnetted, 2 subnets C 10.1.1.0 is directly connected, Serial0/1 O E2 10.1.1.4 [110/ 200 ] via 10.1.1.2, 00:01:41, Serial0/1 146.6.0.0/20 is subnetted, 1 subnets O E2 146.6.0.0 [110/ 200 ] via 10.1.1.2, 00:01:41, Serial0/1 Configuration Example: 4 Modifying the Tag Value of Redistributed Routes Using a Route MapModify the configuration on Router B (see Figure 14-3) to set the tag value for the classless routes to 1 and the classful routes to 2. Router B router ospf 1 redistribute eigrp 1 subnets route-map control-eigrp network 10.1.1.0 0.0.0.3 area 0 ! access-list 1 permit 6.0.0.0 0.15.255.255 access-list 1 permit 146.6.0.0 0.0.15.255 access-list 1 permit 206.6.6.0 0.0.0.15 access-list 1 permit 10.1.1.4 0.0.0.3 route-map control-eigrp permit 10 match ip address 1 set metric 200 set tag 1 ! route-map control-eigrp permit 20 set metric 100 set metric-type type-1 set tag 2 VerificationVerify that the tags have been set on the redistributed EIGRP routes. rtrB# show ip ospf database external 5.0.0.0 OSPF Router with ID (2.2.2.2) (Process ID 1) Type-5 AS External Link States LS age: 164 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 5.0.0.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000007 Checksum: 0x2299 Length: 36 Network Mask: /8 Metric Type: 1 (Comparable directly to link state metric) TOS: 0 Metric: 100 Forward Address: 0.0.0.0 External Route Tag: 2 _______________________________________________________________________ rtrA# show ip route 206.6.6.0 255.255.255.240 Routing entry for 206.6.6.0/28 Known via "ospf 1", distance 110, metric 200 Tag 1 , type extern 2, forward metric 1562 Last update from 10.1.1.2 on Serial0/1, 00:04:40 ago Routing Descriptor Blocks: * 10.1.1.2, from 2.2.2.2, 00:04:40 ago, via Serial0/1 Route metric is 200, traffic share count is 1 Configuration Example: 5 Controlling Route Redistribution Based on Tag ValuesIn Figure 14-4, Router B is learning six routes via EIGRP. The EIGRP routes are redistributed into OSPF with the classful routes assigned a tag of 2 and the classless routes a tag of 1. Router A is redistributing the OSPF external routes into RIP-2. The policy is to redistribute only the classless routes into RIP-2. This can be accomplished using a route map and an IP access list. Because the external routes have been tagged, a route map can be used that redistributes only routes with a tag value equal to 1. Configure the routers as shown in the listing that follows the figure. Initially, all OSPF routes will be redistributed into RIP-2 on Router A. Figure 14-4. A Route Map Can Be Used to Control Route Redistribution Based on the Tag Value
Router A interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Serial0/0 bandwidth 64 ip address 10.1.1.9 255.255.255.252 no ip mroute-cache ! interface Serial0/1 bandwidth 64 ip address 10.1.1.1 255.255.255.252 clockrate 64000 ! router ospf 1 network 10.1.1.0 0.0.0.3 area 0 ! router rip version 2 redistribute ospf 1 metric 1 passive-interface Serial0/1 network 10.0.0.0 no auto-summary _______________________________________________________________________ Router B interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface Serial0 bandwidth 64 ip address 10.1.1.2 255.255.255.252 no ip directed-broadcast ! interface Serial1 bandwidth 64 ip address 10.1.1.5 255.255.255.252 clockrate 64000 ! ! router eigrp 1 network 10.0.0.0 ! router ospf 1 redistribute eigrp 1 subnets route-map set-tags network 10.1.1.0 0.0.0.3 area 0 ! access-list 1 permit 6.0.0.0 0.15.255.255 access-list 1 permit 146.6.0.0 0.0.15.255 access-list 1 permit 206.6.6.0 0.0.0.15 access-list 1 permit 10.1.1.4 0.0.0.3 route-map set-tags permit 10 match ip address 1 set tag 1 ! route-map set-tags permit 20 set tag 2 _______________________________________________________________________ Router C interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface Loopback1 ip address 5.5.5.5 255.0.0.0 ! interface Loopback2 ip address 6.6.6.6 255.240.0.0 ! interface Loopback3 ip address 145.5.5.5 255.255.0.0 ! interface Loopback4 ip address 146.6.6.6 255.255.240.0 ! interface Loopback5 ip address 205.5.5.5 255.255.255.0 ! interface Loopback6 ip address 206.6.6.6 255.255.255.240 ! interface Serial0 bandwidth 64 ip address 10.1.1.6 255.255.255.252 no ip directed-broadcast ! router eigrp 1 network 5.0.0.0 network 6.0.0.0 network 10.0.0.0 network 145.5.0.0 network 146.6.0.0 network 205.5.5.0 network 206.6.6.0 no auto-summary _______________________________________________________________________ Router D interface Serial0/1 ip address 10.1.1.10 255.255.255.252 clockrate 64000 ! router rip version 2 network 10.0.0.0 Verify that Router D is receiving the redistributed OSPF routes from Router A. rtrD# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is not set R 205.5.5.0/24 [120/1] via 10.1.1.9, 00:00:01, Serial0/1 206.6.6.0/28 is subnetted, 1 subnets R 206.6.6.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 R 5.0.0.0/8 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 6.0.0.0/12 is subnetted, 1 subnets R 6.0.0.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 172.16.0.0/24 is subnetted, 1 subnets R 172.16.1.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 R 145.5.0.0/16 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 10.0.0.0/30 is subnetted, 3 subnets C 10.1.1.8 is directly connected, Serial0/1 R 10.1.1.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 R 10.1.1.4 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 146.6.0.0/20 is subnetted, 1 subnets R 146.6.0.0 [120/1] via 10.1.1.9, 00:00:05, Serial0/1 Modify the configuration on Router A so that only OSPF routes with a tag value of 1 get redistributed into RIP. Router A router rip version 2 redistribute ospf 1 metric 1 route-map check-tags passive-interface Serial0/1 network 10.0.0.0 no auto-summary ! route-map check-tags permit 10 match tag 1 VerificationVerify that the only OSPF routes redistributed into RIP on Router A are those routes with a tag value of 1. rtrD# show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR Gateway of last resort is not set 206.6.6.0/28 is subnetted, 1 subnets R 206.6.6.0 [120/1] via 10.1.1.9, 00:00:01, Serial0/1 6.0.0.0/12 is subnetted, 1 subnets R 6.0.0.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 10.0.0.0/30 is subnetted, 3 subnets C 10.1.1.8 is directly connected, Serial0/1 R 10.1.1.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 R 10.1.1.4 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 146.6.0.0/20 is subnetted, 1 subnets R 146.6.0.0 [120/1] via 10.1.1.9, 00:00:02, Serial0/1 Troubleshooting
To avoid problems associated with mutual redistribution, use a distribute list (see Sections 7-5, 7-10, and 7-15) or a route map to allow only routes that have originated in the routing process domain. For example, if EIGRP is redistributed into OSPF and OSPF is redistributed into EIGRP on the same router, then OSPF routes will be redistributed back into OSPF from EIGRP and EIGRP routes will be redistributed back into EIGRP from OSPF. Using a route map or distribute list will prevent this from occurring. |
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