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Beginner

Redistributing OSPF in EIGRP

Good day!

I have noticed that i cant make R4 and also R2 to choose prefered path to R1 over R3...

Where is my mistake?

Can you help me please?

Here is my topology

and configuration of to ABR's

R3:

router eigrp 100

redistribute ospf 1 metric 1544 5 255 1 1500

network 10.1.23.0 0.0.0.255

no auto-summary

!

router ospf 1

log-adjacency-changes

redistribute eigrp 100 subnets route-map MAIN_1

network 10.1.13.0 0.0.0.255 area 0

!

ip forward-protocol nd

!

!

no ip http server

no ip http secure-server

!

access-list 1 permit 10.4.0.0 0.0.0.255

access-list 1 permit 10.4.1.0 0.0.0.255

access-list 2 permit 10.4.2.0 0.0.0.255

access-list 2 permit 10.4.3.0 0.0.0.255

access-list 3 deny   10.4.4.0 0.0.0.255

access-list 50 permit 10.1.0.0 0.0.0.255

access-list 99 permit 10.1.23.0 0.0.0.255

access-list 99 permit 10.1.24.0 0.0.0.255

!

!

!

route-map MAIN permit 10

match ip address 1

set tag 10

!

route-map MAIN deny 11

match tag 10

!

route-map MAIN permit 20

match ip address 2

set tag 20

!

route-map MAIN deny 21

match tag 20

!

route-map MAIN deny 30

match ip address 3

!

route-map MAIN permit 40

match ip address 99

set tag 30

!

route-map MAIN deny 41

match tag 30

!

route-map EI permit 10

match ip address 50

!

route-map EI_1 permit 10

match ip address 50

set tag 101

!

route-map MAIN_1 deny 10

match tag 10

!

route-map MAIN_1 deny 20

match tag 20

!

route-map MAIN_1 deny 30

match tag 30

R2:

router eigrp 100

redistribute ospf 1

network 10.1.23.0 0.0.0.255

network 10.1.24.0 0.0.0.255

default-metric 400 20 255 1 1500

no auto-summary

!

router ospf 1

log-adjacency-changes

redistribute eigrp 100 subnets route-map MAIN

network 10.1.12.0 0.0.0.255 area 0

!

ip forward-protocol nd

!

!

no ip http server

no ip http secure-server

!

access-list 1 permit 10.4.0.0 0.0.0.255

access-list 1 permit 10.4.1.0 0.0.0.255

access-list 2 permit 10.4.2.0 0.0.0.255

access-list 2 permit 10.4.3.0 0.0.0.255

access-list 3 deny   10.4.4.0 0.0.0.255

access-list 50 deny   10.1.0.0 0.0.0.255

access-list 99 permit 10.1.24.0 0.0.0.255

access-list 99 permit 10.1.23.0 0.0.0.255

!

!

!

route-map MAIN permit 10

match ip address 1

set metric 100

set metric-type type-2

set tag 10

!

route-map MAIN permit 20

match ip address 2

set metric 200

set metric-type type-2

set tag 20

!

route-map MAIN deny 30

match ip address 3

!

route-map MAIN permit 40

match ip address 99

set metric 300

set metric-type type-2

set tag 30

!

R3 has filtered enabled to prevent routing loops from eigrp networks. But i cant make R4 and R2 to choose preferd path to R1 Loopback over R3

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Cisco Employee

Redistributing OSPF in EIGRP

Hi Dima,

The loopback address at R1 is known both to R2 and R3 as OSPF internal network. If R3 redistributes this network into EIGRP and advertises it to R2, EIGRP will try to insert this route into R2's routing table using the administrative distance of 170 (as it is an EIGRP external route). However, the OSPF-learned route on R2 has an administrative distance of 110 and is therefore preferred. No change in the OSPF or EIGRP metrics is going to change this because the administrative distance is the first value that is used to break ties when different protocols try to insert the same network into the routing table.

What you could do is to modify the EIGRP configuration on R2 that it assigns an administrative distance of less than 110 to EIGRP external routes, e.g.:

R2:

router eigrp 100

distance eigrp 90 109

Would this be an option for you?

Best regards,

Peter

View solution in original post

3 REPLIES 3
Hall of Fame Cisco Employee

Redistributing OSPF in EIGRP

Hi Dima,

The loopback address at R1 is known both to R2 and R3 as OSPF internal network. If R3 redistributes this network into EIGRP and advertises it to R2, EIGRP will try to insert this route into R2's routing table using the administrative distance of 170 (as it is an EIGRP external route). However, the OSPF-learned route on R2 has an administrative distance of 110 and is therefore preferred. No change in the OSPF or EIGRP metrics is going to change this because the administrative distance is the first value that is used to break ties when different protocols try to insert the same network into the routing table.

What you could do is to modify the EIGRP configuration on R2 that it assigns an administrative distance of less than 110 to EIGRP external routes, e.g.:

R2:

router eigrp 100

distance eigrp 90 109

Would this be an option for you?

Best regards,

Peter

View solution in original post

Beginner

Redistributing OSPF in EIGRP

Yeah. You are right.

Thank you Peter. I have changed EX metric of EIGRP and i 've recieved D EX route.

Thanks a lot;)

Beginner

Redistributing OSPF in EIGRP

Add below command under R2,

access-list 50 permit 10.1.0.0 0.0.0.255

May it will help u

Thnx.

Amit

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