Re: How to COMPLETE the END - TO - END LSP btw non-directly

Hi Asfer,

Have you tried bgp send-label inside the AS like you did for e-bgp peerings?

On Sun, Dec 5, 2010 at 8:41 AM, Asfer Shah <s_asfar_at_hotmail.com> wrote:

> well PRAKASH I fully agree with you , I have tried that also , the BGP SEND
> label is working fine for one leg which only works for point-to-point link
> between the ASBR R9 and the first router R6 connected to it, the problem
> comes
> when I am trying to further expand the LSP from R6 to R2 which is another
> ASBR.
>
> R9--------R6-------R2
>
> its only ebgp between the three and the routes are exchainging easily. The
> problem is that the LSP is not completed btw these three !
> R7/R8(not drawn above) which are both connected to R9 are vpnv4 peered with
> R2(ebgp-multihop)
> We have VRF's on R2 and R7/R8. The routes are exchanged end to end but its
> the
> LSP making troubles.
>
> One more point why do we require to put match mpls label and set mpls label
> on
> R6 , since we are just running bgp labels for the both ebgp links on R6,
> when
> its working fine for one leg (towards R9) why not for the other (towards
> R2)
> ??
>
>
>
> Date: Sun, 5 Dec 2010 11:47:29 +0530
> Subject: Re: How to COMPLETE the END - TO - END LSP btw non-directly
> conncedted ASBR's in InterAS-VPN??? PLEASE Suggest ???
> From: kalsaria.prakash_at_gmail.com
> To: vidhatevivek_at_gmail.com
> CC: s_asfar_at_hotmail.com; tscott_at_ipexpert.com; ccielab_at_groupstudy.com;
> pearlgaurav_at_gmail.com
>
> You need a send-label between R9---R6 and R6--- R2 and do not forget to set
> and match the mpls label where ever necessary
> Regards;Prakash Kalsariahttp://prakashkalsaria.wordpress.com
>
>
> On Sun, Dec 5, 2010 at 11:42 AM, vivek vidhate <vidhatevivek_at_gmail.com>
> wrote:
>
> Hi Asfer,
>
>
>
> Pls paste the tracroute for respective sites and ping responses along with
>
> related configurations if possible.
>
>
>
> So that we can troubleshoot.
>
>
>
>
>
> On Sun, Dec 5, 2010 at 10:51 AM, Asfer Shah <s_asfar_at_hotmail.com> wrote:
>
>
>
> > Thanks Scott for your reply !
>
> > well I have done that at the first place and the problem is that the BGP
>
> > send-label is working fine between the R6 and R9 , where R6 is generating
>
> > the
>
> > Labels for the prefixes, its the other side making troubles for God knows
>
> > what
>
> > reason R2 and R6 are not building up the LSP between them !!
>
> >
>
> > I have tried every possible thing and the LSP will not be UP !!!
>
> > IS this a CISCO BUG ?
>
> > I might be sounding wrong but with so many efforts i seem to lost it !!
>
> >
>
> >
>
> >
>
> > > From: tscott_at_ipexpert.com
>
> > > To: s_asfar_at_hotmail.com; ccielab_at_groupstudy.com; pearlgaurav_at_gmail.com
>
> > > Subject: RE: How to COMPLETE the END - TO - END LSP btw non-directly
>
> > conncedted ASBR's in InterAS-VPN??? PLEASE Suggest ???
>
> > > Date: Sat, 4 Dec 2010 13:46:09 -0500
>
> > >
>
> > > On R6 and R9 you need to make sure you do "no bgp default route-target
>
> > > filter"
>
> > >
>
> > >
>
> > >
>
> > > For the recursive problem you need to make sure you are not announcing
>
> > your
>
> > > tunnel sources thru the tunnel. That is basic recursive lookup problem
>
> > >
>
> > >
>
> > >
>
> > > Regards,
>
> > >
>
> > >
>
> > >
>
> > > Tyson Scott - CCIE #13513 R&S, Security, and SP
>
> > >
>
> > > Managing Partner / Sr. Instructor - IPexpert, Inc.
>
> > >
>
> > > Mailto: tscott_at_ipexpert.com
>
> > >
>
> > >
>
> > >
>
> > >
>
> > >
>
> > > From: Asfer Shah [mailto:s_asfar_at_hotmail.com]
>
> > > Sent: Saturday, December 04, 2010 12:18 AM
>
> > > To: ccielab_at_groupstudy.com; pearlgaurav_at_gmail.com; tscott_at_ipexpert.com
>
> > > Subject: RE: How to COMPLETE the END - TO - END LSP btw non-directly
>
> > > conncedted ASBR's in InterAS-VPN??? PLEASE Suggest ???
>
> > >
>
> > >
>
> > >
>
> > >
>
> > >
>
> > > > Dear All,
>
> > > > I have tried my luck but I am forced to drop the below scnerio in
> whcih
>
> > we
>
> > > > have inter-as VPN but the ASBR's are not directly connected ?
>
> > > > Can any one help , I am having my brains lost with this scenerio ?
>
> > > >
>
> > > > R8---------R9-----------------R6--------------------R2
>
> > > > | |
>
> > > |
>
> > > > | |
>
> > > |
>
> > > > | |
>
> > > |
>
> > > > | |
>
> > > |
>
> > > > R4 R5 R3
>
> > > >
>
> > > > R8 and R9 are both in same AS 789 and are Mp-BGP neighbors.
>
> > > > R8 and R4 are PE-CE in vrf ABC-1 & R9 and R5 as PE-CE as ABC-2
>
> > > > R6 is in AS66 and its ipv4 ebgp peered with R9 and R2.
>
> > > >
>
> > > > R4 and R5 can reach each other routes since the LSP is complete.
>
> > > >
>
> > > > We have another AS22 on R2 with R3 as in vrf ABC-3.
>
> > > > R2 is MP-BGP Vpnv4 peered with R8. R3 can see the routes in its
> routing
>
> > > table
>
> > > > for both the cites ABC-1 and ABC-2 from R4 and R5 vice versa.
>
> > > > But when tried to ping , there is a failure because of the incomplete
>
> > LSP.
>
> > > > The problem is to complete the LSP between the R2 and its Vpnv4 ebgp
>
> > peer
>
> > > R8.
>
> > > >
>
> > > > *I tried runnin LDP between R6-R9 and R6-R2 but no use since there is
>
> > no
>
> > > > IGP btw R9/R6/R2 so that LDP cannot generate the labels for the
>
> > end-to-end
>
> > > > LSP
>
> > > >
>
> > > > *I tried running BGP labels by mentioning the BGP send-label to the
>
> > ipv4
>
> > > > ebgp neibors R6-R2 and R6-R9 but the EBGP VPNv4 peering btw R2 & R8
>
> > > break
>
> > > > when I do this ?
>
> > > >
>
> > > >* I even tried configuring GRE Tunnel between R2 and R8 and ran MPLS
> on
>
> > it
>
> > > , but the tunnel comes up and then goes down after 10 secs, message
> comes
>
> > > saying
>
> > > > tunnel turned down because o recursive lookup.
>
> > >
>
> > > >
>
> > > > Waiting for the experts FEEDBACK :)
>
> > > >
>
> > > >
>
> > > > Blogs and organic groups at http://www.ccie.net
>
> > > >
>
> > > >
> _______________________________________________________________________
>
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>
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>
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> > >
>
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>
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> >
>
> >
>
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> >
>
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>
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> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
> >
>
>
>
>
>
> --
>
> Thanks & Regards,
>
>
>
> Vivek Vidhate.
>
>
>
>
>
> Blogs and organic groups at http://www.ccie.net
>
>
>
> _______________________________________________________________________
>
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>
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>
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Received on Sun Dec 05 2010 - 12:28:42 ART