[c-nsp] Inter VRF Routing help needed

[Oliver Boehmer (oboehmer)]

cc loo <mailto:s00664233 at gmail.com> wrote on Thursday, September 11,
2008 5:05 PM:

> Hi Oliver,
> 
> Thanks for the quick reply.
> 
> Indeed i was referring to VRF-LITE
> 
> In the cisco.com example, they gave this
> Router(config)# ip vrf customer_a
> Router(config-vrf)# rd 1:1    <----
> Router(config-vrf)# route-target both 1:1  <----
> Router(config)# interface fastEthernet 0.1
> Router(config-subif)# ip vrf forwarding customer_a
> 
> is there any specific reason why cisco recommends using "both"
> (export/import) for its own RD ? 

the RD is not exported, the RT is. see answer to next question.

Well, the "import" is not really needed in this specific case as there
is no other VRF exporting routes with this route-target (so no point
importing it). 

> 
> Oliver's example is here, but i would like to confirm if 1:100 is a
> typo or should it be 1:1 (like its own RD?): ip vrf customer_A
>  rd 1:1       <-----
>  route-target export 1:100     <----
>  route-target import 1:900

RD and route-target are different things. They can be the same, but they
must not be (in an mpls-vpn, they usually aren't the same as the RD is
unique per PE per VRF). 

> I wonder wondering if this is the correct place to post newbie
> questions like these ? 
> Im a junior engineer in a singaporean isp, hoping to learn more
> tricks and tips in the field of IP planning :D 

well, I guess it's like all lists where folks help each other: If people
see that you haven't done your homework, you might not get a reply. 

	oli