The MPLS-OPS Archive

["Gopal@Yahoo" <gnaganab@yahoo.com>]

Namaste Anna.,
On both PE and CE, the interface is selected based on
how a route is learned.
If the CE learned a route whose next-hop is across
if_z, the outgoing intf is if_z.

in the following;

CE 1 Routing Table
Destination   Next-Hop   Interface
10.1/16        Direct      if_x
10.2/16         PE 1       if_z

CE1 learned 10.2.0.0/16 from PE1 thru if_z.

Hope that answers your q to some extent.

Best regards,
Gopal

--- Mehwish Ahmed <mehwishkhurshid@yahoo.com> wrote:
> 
> aslam o alakum
> 
> In case of BGP-MPLS, how interface are defined at PE
> and at CE.Like if_1 ,if_2 and if_3 are  interfaces
> of site1 site2 and site3 at PE roting table for
> directly connected sites1,2,3.but there r some
> internal interface like if_x and if_z which r
> defined at CE routing tables that i guess if_x for
> figuring out if packet is destined for same site and
> if_z if packet is destined for site connected via
> VPN.
> refrence
>
http://www.juniper.net/techcenter/techpapers/200012-03.html
> my question is how these interfaces are defined and
> when interface information is mapped to packet?? or
> on which bases CE decides its a if_x or if_z and
> also how Pe decides its if_1 or if_2 ???
>  
> 
> 
> 
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