Theorotically its simple.
You won't run your LDP without any routing protocol(s). So as a result of
exchange of routing messages and subsequent calculations, there will be
routes added to new hosts/networks in the routing table. Since primary
purpose of LDP is to create hop-by-hop LSPs, it will work with the routing
table thus. Modifications to your routing table can generate necessary
call-backs to your LDP implementation. (In LDP terminology, this is the
new FEC.) If you are doing traffic engineering, there will be some CSPF
algorithm (perhaps offline) working which will give u a constraint based
path, now if you want to setup LSP for that, you would obviously require
labels :-) .
I recommend you to read rfc3031 and rfc3036 procedures to know more about
it. there is also a FAQ maintained at mplsrc.com. You may have a look at
that as well.
hth,
-abhijit
jagdish Garg wrote :
>Hi Experts
>I have one small question on Downstream on demand . Who come to know there
>is need for requesting a label , MPLS or LDP and how ?
>
>
>Thanks in advance
>Jagdish Garg
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