The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] [MPLS-OPS]: Re: Advertising Routes learnt from PE to PE
On 5/14/03 1:58 PM, "Spice Sylvia" <falsesylvia@yahoo.co.uk> wrote: > Hello Aamer, > > Why would the "rd" have changed? |--------1 HUBCE HUBPE |--------2 Suppose the sites prefixes are sent to the HUBPE, which advertises to HUBCE over link 2 (lets' call this vrf2), the HUBCE advertises this back to the HUBPE over link 1 (vrf1). vrf2 and vrf1 will have different rd's because they are different vrfs. > > Is this a new feature? > > How does changing RD help? > > > Aamer Akhter <aakhter@cisco.com> wrote: > On 5/14/03 10:51 AM, "Ferit Yegenoglu" wrote: > >> >> 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. > > But to BGP, these "readvertised" prefixes are not the same. The rd will have > changed. > >> >> 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 >>> >>> __________________________________________________ >>> Yahoo! Plus >>> For a better Internet experience >>> http://www.yahoo.co.uk/btoffer >> -- Aamer Akhter / aa@cisco.com NSITE - cisco Systems
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