[c-nsp] leaking only a couple routes between 2 vrf's

[Paul Wells]

Hi Aaron,

If you have a recent IOS release you can use the "route-replicate" 
command to do this directly without requiring BGP.  For example:

vrf definition blue
  !
  address-family ipv4
   route-replicate from vrf red unicast all route-map red2blue
  exit-address-family
!
vrf definition red
  !
  address-family ipv4
  exit-address-family
!
ip prefix-list red2blue seq 5 permit 90.0.0.0/8 le 32
ip prefix-list red2blue seq 10 permit 91.0.0.0/8 le 32
!
route-map red2blue permit 10
  match ip address prefix-list red2blue
!

R1#sh ip ro vrf red

Routing Table: red
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
...
        + - replicated route, % - next hop override

Gateway of last resort is not set

       10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.0.0/24 is directly connected, Ethernet0/0
L        10.1.0.180/32 is directly connected, Ethernet0/0
       90.0.0.0/24 is subnetted, 2 subnets
O        90.1.0.0 [110/11] via 10.1.0.181, 00:30:26, Ethernet0/0
i L1     90.2.0.0 [115/20] via 10.1.0.181, 00:00:05, Ethernet0/0
       91.0.0.0/24 is subnetted, 1 subnets
O        91.1.0.0 [110/11] via 10.1.0.181, 00:30:16, Ethernet0/0
       92.0.0.0/24 is subnetted, 1 subnets
O        92.1.0.0 [110/11] via 10.1.0.181, 00:30:16, Ethernet0/0

R1#sh ip ro vrf blue

Routing Table: blue
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
...
        + - replicated route, % - next hop override

Gateway of last resort is not set

       90.0.0.0/24 is subnetted, 2 subnets
O   +    90.1.0.0 [110/11] via 10.1.0.181 (red), 00:30:38, Ethernet0/0
i L1+    90.2.0.0 [115/20] via 10.1.0.181 (red), 00:00:17, Ethernet0/0
       91.0.0.0/24 is subnetted, 1 subnets
O   +    91.1.0.0 [110/11] via 10.1.0.181 (red), 00:30:28, Ethernet0/0


This is documented as part of the "Easy Virtual Network" feature, but 
can be used by itself. See, for example:

http://www.cisco.com/en/US/docs/ios-xml/ios/evn/configuration/xe-3s/Configuring_Easy_Virtual_Network_Shared_Services.html

Regards,
Paul

On 11/01/2012 04:28 PM, Aaron wrote:
> What is a clean/easy way to leak a couple routes between two vrf's ?  if you
> have links to docs or sites that explain this or you know how , lemme know
> please.
>
> Aaron
>
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