Re: [mpls-linux-general] Ldpd questions

[Adrian P. <adr...@gm...>]

Hello,

My reply is inline.

On 10/21/07, 王奕元 <dad...@gm...> wrote:
> Hi, dear all.
>
> Following is my network topology,
>
> host 1 --- A --------- B --------- C --- host 2
>
> A and B connect with each other,
> and B connect with C.
> Now I have some questions.
>
> 1. Can it work well if A, B and C all implement ldpd?
>     I mean, host 1 send a packet to host 2,
>     and the packet from A to B, it pushes one label,
>     then the packet from B to C, it pushes another label,
>     in the end, C pop the label and send the packet to host 2.
>
What you ask can be done by ldpd (but I haven't tested it - I'm not
sure it actually works), but you need a working IGP (preferably OSPF).

> 2. Do I have to set router-id in ospfd.conf for ldp?
>
Router-id is optional. If you don't set it, it will be chosen as an ip
from a interface for each router. As long as the IPs are unique and
OSPF knows about them, it's ok.

> 3. If I want to create a LSP from A to C and also inverse, how do I operate
> it?
>     Do LSP create by downstream on demand or downstream unsolicited?
>
I haven't been able to successfully set up a LDP domain (last time I
tried was a year ago), but ldpd creates LSPs automatically both ways
using downstream unsolicited by default (please correct me if I'm
wrong). You can use downstream on demand, but you must say so in the
configuration (I don't know if it works).

> 4. Can A send a Targed Hello to C and then create a label about A to C?
>     How about the inverse? Can C work automatically or manually?
>
I have no idea about this, but if you manage to get it working, let us know...

Good luck,
Adrian Popa

> Because I can't find the document about ldpd,
> and nowadays I need to implement above things.
> Can anyone give me some advices?
>
> Thanks for your answering.
> Regard.
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