The MPLS WG Archive

["Ferit Yegenoglu" <ferit@isocore.com>]

Sylvia,

One possible scenario where this could happen is the hub-spoke BGP/MPLS
VPN. In this case the spoke PEs advertise their routes with a Route
Target value "Hub". The hub PE imports these routes and advertises them
to the CE router in the hub site. These routes are advertised across the
hub site and eventually back to the PE hub router via a different
interface. The PE hub router then readvertises these routes to the spoke
PEs with a Route Target value "Spoke" and a different VPN label. 

Ferit



> -----Original Message-----
> From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET] On Behalf Of Sugar,
> Sylvia
> Sent: Wednesday, May 14, 2003 10:07 AM
> To: mpls-ops@mplsrc.com
> Cc: mpls@UU.NET
> Subject: Advertising Routes learnt from PE to PE
> 
> Hi,
> WIll a PE router ever advertise a route it learns from another PE
router
> to some other PE router.
> I dont think it will ever do that as all the PE routers are IBGP peers
and
> would generally be in
> full mesh.
> 
> Is there any case when this might happen .. i.e. a PE router
advertises a
> Route learnt from one PE
> to another PE. How can one do that .. because IMHO the label that will
be
> advertised by the former
> PE router will be for the PE router to which he sends the UPDATE. How
can
> this PE router advertise
> another PE router the same label?
> 
> Moreover, if for some reason he has to .. does he assign a new label
and
> then advertise?
> 
> ANy comments on this would be very helpful!
> 
> Silviya Sugar
> 
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