[c-nsp] Inter VRF Routing help needed

[cc loo]

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 ?

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

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



On Thu, Sep 11, 2008 at 10:41 PM, Oliver Boehmer (oboehmer) <
oboehmer at cisco.com> wrote:

> cc loo <> wrote on Thursday, September 11, 2008 3:58 PM:
>
> > Hi All,
> > im pretty new to networking and require some assistance here with
> > VRF-lite
> >
> > Scenario :
> >
> > i would like to establish a hub-and-spoke topology with multiple VRFs.
> >
> ...
> >
> > I would like vrf_customer_A to exchange routes with vrf_HUB but not
> > vrf_customer_B,
> > and vrf_customer_B with vrf_Hub but not vrf_customerA.
> >
> > Basically, each customer vrf can only see the hub, but not each other.
> > I tried following the guide at
> >
> http://www.cisco.com/univercd/cc/td/doc/product/ong/15400/r60docs/r60eth
> gd/546vrf.htm<http://www.cisco.com/univercd/cc/td/doc/product/ong/15400/r60docs/r60ethgd/546vrf.htm>
> >
> > i created afew instances of vrf, tried import/export the RDs but my
> > routing table still only show routes that are "connected" in the vrf
> > only.
> > I've heard that i require ospf or bgp to exchange routes between vrf
> > (within the same router).
> >
> > What is the simplest method to achieve my desired scenario ?
> >
>
> I guess you are talking about vrf-lite (i.e. no mpls involved). you can
> do it like that:
>
> ip vrf customer_A
>  rd 1:1
>  route-target export 1:100
>  route-target import 1:900
> !
> ip vrf customer_B
>  rd 1:2
>  route-target export 1:200
>  route-target import 1:900
> !
> ip vrf Hub
>  rd 1:9
>  route-target export 1:900
>  route-target import 1:100
>  route-target import 1:200
> !
> router bgp 65000
>  address-fam ipv4 vrf customer_A
>  redistribute static
>  redistribute connected
>  address-fam ipv4 vrf customer_B
>  redistribute static
>  redistribute connected
>  address-fam ipv4 vrf Hub
>  redistribute static
>  redistribute connected
>
>
> If you add routing protocols to it, you also need to redistribute those
> into BGP. all the import/export stuff is done via BGP..
>
>        oli
>