FW: [c-nsp] One BGP-L2VPN question

Fri Aug 5 05:30:26 EDT 2005

Hi,

  The fact that the NLRI contains  a label is indicated by the
AFI/SAFI field. So how can normal BGP be used to send labels?

  While using OSPF we do not need to send any such label information,
only the prefix is sent, but why do we need label information in case
of BGP ( iBGP)?

Thanks
Arnab

On 8/5/05, Gautam <gautam_attravanam at sifycorp.com> wrote:
> Yes it will be present in the NLRI Prefix field and not in MP NLRI as there
> is no MP Extensions in L2VPN (assuming it is AToM).
> 
> 
> -----Original Message-----
> From: Arnab Bakshi [mailto:arnab.bakshi at gmail.com]
> Sent: Friday, August 05, 2005 2:12 PM
> To: Gautam; cisco-nsp at puck.nether.net
> Subject: Re: FW: [c-nsp] One BGP-L2VPN question
> 
> 
>    How should the Update message look like,I mean, will the label be
> present with the NLRI prefix field in Update Msg rather than sending
> it using MP_REACH_NLRI attribute.
> 
> On 8/5/05, Gautam <gautam_attravanam at sifycorp.com> wrote:
> >
> > Dont send label through MP-BGP. It should be under ipv4 address-family.
> > -----Original Message-----
> > From: Arnab Bakshi [mailto:arnab.bakshi at gmail.com]
> > Sent: Friday, August 05, 2005 12:33 PM
> > To: Gautam
> > Cc: cisco-nsp at puck.nether.net
> > Subject: Re: FW: [c-nsp] One BGP-L2VPN question
> >
> >
> > Hi,
> >
> >   I tried by sending label in MP_REACH_NLRI in BGP but the problem
> > still exists and the mpls forwarding  table is still not updated with
> > the prefix.
> >  the following is the AFI/SAFI value is used :
> >
> >   AFI = 1 (IPv4 Address)
> >   SAFI = 4 (Labelled Unicast).
> >
> > The ip routing table is updated successfully. The labels sent are proper.
> > Is this the correct way or there should be more changes.
> >
> > Thanks
> > Arnab
> >
> >
> > On 8/4/05, Gautam <gautam_attravanam at sifycorp.com> wrote:
> > > NO Normal BGP will do as you dont transport any extended communities
> (RTs
> > > etc). ensure that you use send-label in the BGP and ensure the neighbors
> > are
> > > reachable through an IGP. This should work.
> > >
> > > -----Original Message-----
> > > From: Arnab Bakshi [mailto:arnab.bakshi at gmail.com]
> > > Sent: Thursday, August 04, 2005 9:53 AM
> > > To: Gautam; cisco-nsp at puck.nether.net
> > > Subject: Re: FW: [c-nsp] One BGP-L2VPN question
> > >
> > >
> > > Hi,
> > >
> > >    So BGP can be used as the routing protocol between PE-PE ?
> > >
> > >   Shall I have to use MP-BGP in this case.
> > >
> > >   One of my PE is Cisco 7206. When I am using core BGP the ip routing
> > > table is updated
> > > with the route but the mpls forwarding table is not updated and thus
> > > the PW is not coming
> > > up.
> > >
> > >   Do I have to perform any configuration on the CISCO or shall I have
> > > to use MP-BGP?
> > >
> > > Thanks
> > > Arnab
> > >
> > > On 8/4/05, Gautam <gautam_attravanam at sifycorp.com> wrote:
> > > > Hi
> > > >
> > > > If you are talking of the protocol between PE-PE, you can use any
> > protocol
> > > > as long as the PE label is reachable and the end-to-end LSP is up.
> There
> > > is
> > > > no question of PE-CE Routing protocol as the link is a L2 Link. CE-CE
> > > > routing protocol can be anything as the L2VPN is a pseudowire. ANy
> > issues
> > > > Pls let me know
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: cisco-nsp-bounces at puck.nether.net
> > > > [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Bruce Pinsky
> > > > Sent: Thursday, August 04, 2005 12:28 AM
> > > > To: Arnab Bakshi
> > > > Cc: cisco-nsp at puck.nether.net
> > > > Subject: Re: [c-nsp] One BGP-L2VPN question
> > > >
> > > >
> > > > -----BEGIN PGP SIGNED MESSAGE-----
> > > > Hash: SHA1
> > > >
> > > > Arnab Bakshi wrote:
> > > > | Hi,
> > > > |
> > > > |   I have a question regarding the routing protocol to be used in
> case
> > of
> > > > L2VPN.
> > > > |
> > > > |   Can IP routes be advertised using BGP so that the LFIB is updated
> in
> > > > | the PE router and thus pseudowire can be established ? Currently I
> am
> > > > | using OSPF as the routing protocol, but I also want to use BGP as a
> > > > | routing protocol.
> > > > |
> > > > |   If BGP can be used then shall we have to use MP-BGP ? What shall
> be
> > > > | the AFI/SAFI values in this case?
> > > > |
> > > >
> > > > The routing protocol for what in the L2VPN?
> > > >
> > > > Where are you using OSPF now?  PE->PE routing, PE->CE routing, ????
> > > >
> > > > BGP is often used as the PE->CE routing protocol.  In that case, it is
> > not
> > > > MP-BGP, but simply a regular eBGP session.
> > > >
> > > > - --
> > > > =========
> > > > bep
> > > >
> > > > -----BEGIN PGP SIGNATURE-----
> > > > Version: GnuPG v1.4.0 (MingW32)
> > > >
> > > > iD8DBQFC8RPSE1XcgMgrtyYRArE/AKDJBibUDpVUGxpLSphoJy6F5F48GwCg/lll
> > > > uPLSiMjuT/KjmTgJNFHmbmw=
> > > > =rS8D
> > > > -----END PGP SIGNATURE-----
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> >
> > --
> > Arnab Bakshi
> > Software Engineer
> > Conformance-ANVL
> > CalaKol-IXIA.
> > (M) 09830660593
> > www.ixiacom.com
> >
> >
> 
> 
> --
> Arnab Bakshi
> Software Engineer
> Conformance-ANVL
> CalaKol-IXIA.
> (M) 09830660593
> www.ixiacom.com
> 
> 

-- 
Arnab Bakshi
Software Engineer
Conformance-ANVL
CalaKol-IXIA.
(M) 09830660593
www.ixiacom.com