Migrate Rip to OSPF with BGP redistribution

[zalagan80]

Hi, i have a quite large network working with RIP as a general routing protocol. All those routers are the backbone. The ISP provides a backup backbone running BGP but the RIP backbone is slected as principal backbone for all the traffic. In one building we already have an OSPF network that distribute into the RIP so we have a multiple redistribution (OSPF to RIP and RIP to BGP). All this is a real problem and i need to migrate all the rip process to OSPF and leave only ospf redistributing into BGP. The idea is to put a AD of 121 into the ospf, configure it into all the routers and later remove the RIP. The problem is that I'm very upset about possible loops with all those redistributions. Does anybody has an advice to prevent them? Regards

[ronpestler1]

Hi zalagan80,

i think you search something like a combination from route-map and "set tag".
So you can do the following (only for one direction):

RIP > OSPF redistribution
route-map rip-outbound-filter permit 10
 set tag rip
router rip
 redistribute .... route-map rip-outbound-filter
OSPF < RIP
route-map ospf-inbound-filter deny 10
 match tag rip
route-map ospf-inbound-filter permit 20
!
router ospf 1
 distribute-list route-map ospf-inbound-filter in

Or you check if it possible for you to move the ospf area 0 to the actually rip devices and
set the actually ospf area to a different one and distribute only a summary route into the
new ospf area 0. Or or or...

Best regards