Re: Inter Area MPLS TE with OSPF

Hi,

The reason for LdpoverRsvp called LDP tunnelling is generally done when you
have ERO's for Rsvp while the topology does not allow for LDP is what i
believe. For an instance, pe---(single link) ----p----(multiple
ways)--p----(singlelink)-----pe so, technically you can run Rsvp between
multiple P's and Ldp between Pe and Pe, so that we can use Te capabilities
of RSVP. I have heard about implementations of CR-LDP but do not know how
that replaces RSVP TE or if it is a valid alternative , not sure.

Best Regards
Rakesh M

On Thu, Jan 10, 2013 at 10:02 PM, Routing Freak <routingfreak_at_gmail.com>wrote:

> HI
>
> LDP over RSVP is usually done where Inter Area TEs are created. SO u can
> have a RSVP tunnels and on top of it u can run LDP inorder the Ce traffic
> to pass thru.
>
>
> On Sun, Dec 30, 2012 at 7:28 PM, Radioactive Frog <pbhatkoti_at_gmail.com
> >wrote:
>
> > John,
> >
> > Generic document but in details on inter-as TE.
> >
> >
> >
> http://www.cisco.com/en/US/partner/docs/ios/mpls/configuration/guide/mp_te_inter_as_te_ps6922_TSD_Products_Configuration_Guide_Chapter.html#wp1053704
> >
> > HTH
> > -frog
> >
> > On Sun, Dec 30, 2012 at 9:44 AM, John Neiberger <jneiberger_at_gmail.com
> > >wrote:
> >
> > > Thanks, Mohammad! That's very interesting. I'm pretty new to MPLS TE
> and
> > I
> > > have a question about how this configuration works. Actually, I've
> never
> > > seen it configured before, so I guess you could say I'm extremely new
> to
> > > it. lol
> > >
> > > Based on these configs, here's how I think this works. Please correct
> me
> > if
> > > I'm wrong at any point.
> > >
> > > 1. In the beginning, Tunnel0 is down; static routes pointing to the
> > tunnel
> > > are inactive; routes are being exchanged via OSPF;
> > > 2. Once OSPF routes have been learned, the tunnel endpoint 5.5.5.5
> > becomes
> > > reachable, so R1 tries to bring up the tunnel using RSVP and the
> > specified
> > > explicit route
> > > 3. The RSVP request traverses the network to R5, who starts the
> > reservation
> > > process in reverse until the LSP is set up.
> > > 4. Once the LSP is up end to end, Tunnel0 comes up, so the static route
> > to
> > > 5.5.5.5 via Tunnel0 on R1 becomes active
> > > 5. A ping from 1.1.1.1 to 5.5.5.5 now is label-switched via Tunnel0 and
> > > follows the explicit path setup via RSVP.
> > >
> > > Is that basically how that works? I really don't know. I'm just trying
> to
> > > piece it together based on your configs.
> > >
> > > Thanks again,
> > > John
> > >
> > >
> > > On Sat, Dec 29, 2012 at 2:47 PM, Mohammad Khalil <eng_mssk_at_hotmail.com
> > > >wrote:
> > >
> > > >
> http://eng-mssk.blogspot.com/2012/12/interarea-mpls-te-with-ospf.html
> > > >
> > > > BR,
> > > > Mohammad
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
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> --
> Regards
> Routing Freak CCIE#35889 (SPv3)
>
>
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