[c-nsp] EIGRP redistribution between 2 VRFs

[Jeff Kell]

Michael Lyngbøl wrote:
> On 14.02.2008 16:06:03 -0500, Luan Nguyen wrote:
>   
>> Say i have VRF RED one one of the interface, and VRF BLUE on another
>> interface.  And i need to run EIGRP on both of them.  They have their own
>> ASN and don't want to change them.  How do i send routes learned from RED
>> into BLUE and vice versa?  

> Import the proper route-targets in VRF RED and VRF BLUE.
> You can also just import+export from/to one of the VRFs. Might need to
> attach import/export maps to filter which routes you'd like to
> import/export.

That's the general idea, but it's not quite that simple (I wish it 
was!).   Or at least I could not get it to actually work with 
import/export alone.

You must run iBGP for the import/export to actually work (at least on 
Catalyst hardware as CE/PE, IOS 12.2) and have iBGP redistributing your 
EIGRP instances, e.g.:

> router bgp 99999
>  !
>  address-family ipv4
>  redistribute connected
>  exit-address-family
>  !
>  address-family ipv4 vrf RED
>  redistribute connected
>  redistribute eigrp [reds-ASN]
>  exit-address-family
>  !
>  address-family ipv4 vrf BLUE
>  redistribute connected
>  redistribute eigrp [blues-ASN]
>  exit-address-family

If you subsequently want your red/blue EIGRP's to redistribute their 
respective imported routes further, you'll need to redistribute BGP 
within the EIGRP instances as well.

Of course if all this "extra stuff" is NOT needed, I'd love to hear 
about it.  It took the import/export plus mutual redistribution in my 
case to get it to work as desired, and I ran out of patience before 
trying to selective remove bits here and there to see which ones were 
NOT part of the solution.

Jeff