advertise network redistribute single host

[jmecklenburg]

Hi

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.

Any idea.

[Richard Burts]

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.

HTH

Rick

[jmecklenburg]

I know several network from RIP in the VRF1:1 but I want redistribute just a few host from the RIP in to OSPF in other VRF.

The router B must know only host, not network.

Thanks

[Giuseppe Larosa]

Hello jmecklenburg,

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

no auto-summary

redistribute rip

redistribute static

!

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

!

vrf 1:1

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

Giuseppe

[jmecklenburg]

Thanks Giuseppe

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.

Regards!

[Jon Marshall]

Never done this but maybe use IP SLA with the static routes as long as your IOS supports the vrf keyword for IP SLA.

Jon