Redistribution EIGRP to OSPF

[alihassan1618]

Hi Guys, 

Learing Routing Questions. Kindly help..!!!

Which routes from OSPF process 5 are redistributed into EIGRP?

A. E1 and E2 subnets matching access list TO-OSPF 
B. E1 and E2 subnets matching prefix list TO-OSPF
C. only E2 subnets matching access list TO-OSPF
D. only E1 subnets matching prefix list TO-OSPF

I'm confused in "A" and "C" Since i'm sure "prefix-list" is not used in route-map :) and i remember that by default OSPF chooses E2 to redistribute to routes with cost 20. 

please help with proper explanation. Thanks in advance. 

[Giuseppe Larosa · Accepted solution]

Hello AliHassan1618,

the answer should be A, because both O E1 and O E2 are external routes and it is matching external routes and not also route type.

To be noted in real world you are going to do the opposite redistribute only internal routes or use route tags to deny external routes coming from EIGRP.

Hope to help

Giuseppe

[alihassan1618]

Thanks a lot brother.

[Ankt Tiwari]

Giuseppe Larosa is correct.... when you redistribute ospf with metric external it will share both type of external prefix if present O E1 & O E2