I have a the follow topology one router with VRF 1:1 advertising to me a networks from RIP and for other VRF 1:3 with OSPF. and import/export network without problem
but I need know a network for RIP then redistrubute just a single host in to OSPF.
I try with route-map and prefix list but the configuration doesn't work.
There are things about your situation that are not clear to me. But one thing is clear: if you want to redistribute just a single host to OSPF then you must have a host specific route to advertise.
as explained by Richard routing protocols and also import /export between VRFs work on existing prefixes.
By looking at the network diagram you can export using an export-map the whole prefix 192.168.100.0/24 from VRF 1:1 to VRF 1:3 but not specific host routes.
You would need /32 static routes and then to redistibute these static route in MP BGP address-family ipv4 vrf 1:1.
The static routes should point to the correct outgoing interface to avoid to create routing issues within VRF 1:1
So you would need something like
ip route vrf 1:1 192.168.100.100 255.255.255.255 192.168.100.1
! here I suppose that 192.168.100.1 is the IP address in VRF 1:1 and that 192.168.100.0/24 is connected
router bgp <your ASN>
address-family ipv4 vrf 1:1
and under vrf 1:1 definition you should invoke an appropriate route-map
ip prefix-list HOST-ROUTES seq 5 permit 192.168.100.100/32
! other lines for other host routes
route-map EXPORT-HOST-ROUTES permit 10
match address prefix-list HOST-ROUTES
set route target 1:3
export map EXPORT-HOST-ROUTES.
However, I would advertise the whole 192.168.100.0/24 it is a cleaner design.
Because the host static routes can create connectivity problems within the vrf 1:! routing context.
Hope to help
I know the process to import/export routing the problem using static routing for the redistribution is when the connection to WAN fail in the OSPF the routing still redistribute and the router B still knowing the host by OSPF until the WAN is down.
Never done this but maybe use IP SLA with the static routes as long as your IOS supports the vrf keyword for IP SLA.