14-6: redistribute routing-process process-id route-map route-map-name
Syntax Description:
routing-process—Routing process to redistribute into OSPF. The routing process can be BGP, Connected, EGP, EIGRP, IGRP, ISIS, ISO-IGRP, Mobile, ODR, OSPF, RIP, or Static.
process-id—The process ID of the routing process (if applicable).
route-map-name—Name of the route map used to control which routes are redistributed or to set the parameters of the redistributed routes (metric, metric-type, or tag).
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:
A Class A address with an 8-bit mask
A Class B address with a 16-bit mask
A Class C address with a 24-bit mask
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 6: Controlling the Routes to Be Redistributed Based on IP Address
In 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.
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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
Verification
Verify 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