It sounds like you are looking at case two in the Cisco link that you provided, where PE2's loopback is learned by PE1 from an LDP message that is sent from P2. Is this the scenario you are talking about? If it is then this is LDPoverRSVP. Based on the cisco example here is what your configs might look like-<div>
<br></div><div>P2's config:</div><div><br></div><div><div>A:P2>config>router>ldp# info </div><div>----------------------------------------------</div><div> prefer-tunnel-in-tunnel</div><div> interface-parameters</div>
<div> interface "to-PE2"</div><div> shutdown</div><div> exit</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>targeted-session</div><div> peer 10.2.2.2</div>
<div> tunneling</div><div> lsp "to-PE1"</div><div> exit</div><div> exit</div><div> </div><div>PE1's config:</div><div><br></div><div>
<div>A:P2>config>router>ldp# info </div><div>----------------------------------------------</div><div> prefer-tunnel-in-tunnel</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>targeted-session</div>
<div> peer 10.5.5.5</div><div> tunneling</div><div> lsp "to-P2"</div><div> exit</div><div> exit</div></div><div><br></div>
<div><br></div><div>Hope this helps-</div><div><br></div><div>Dan</div><br><div class="gmail_quote">On Fri, Aug 13, 2010 at 5:27 PM, B Dog <span dir="ltr"><<a href="mailto:deadheadblues@gmail.com">deadheadblues@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hello,<br>
<br>
Consider the topology:<br>
<br>
CE1--PE1--P1--P2--PE2--CE2<br>
<br>
And an MPLS-TE tunnel exists between PE1 and P2 (no LDP on this path)<br>
<br>
In the Cisco world we must enable LDP on the tunnel when it does not<br>
terminate at the egress PE.<br>
(For more info, read here:<br>
<a href="http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a0080125b01.shtml" target="_blank">http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a0080125b01.shtml</a>)<br>
<br>
Is there a similar configuration in Alcatel SR OS?<br>
I have been reading the guides, but can't seem to make sense of what I<br>
am reading.<br>
Is this called LDP over RSVP?<br>
Can anyone provide an example?<br>
<br>
Thank you.<br>
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</blockquote></div><br></div>