Re: MPLS LDP ports

Thanks for all for taking time and responding back. I have also seen the
doc which Jay mentioned on CCO saying tcp 646 is required. As Marko has
said that the for initial discovery of ldp peers udp port 646 is required.
If the the ldp peer relationship has already established and ports are
locked down except tcp port 646 the peer relationship will still work. If
all the ports are closed between ldp peers and only port open is tcp 646
then the peer relationship will not establish until udp 646 is opened on
which peers will join the multicast group. So any one reading the
following doc be aware of this fact.

Kind regards

On 24 November 2012 18:28, Jay McMickle <jay.mcmickle_at_yahoo.com> wrote:

> TCP 646. Were you not able to locate that on the DOCCD?
>
>
> http://www.cisco.com/en/US/tech/tk436/tk428/technologies_q_and_a_item09186a00800949e5.shtml
>
> Q. What protocol and port numbers do LDP and TDP use to distribute labels
> to LDP/TDP peers?
>
> *A. *LDP uses TCP port 646, and TDP uses TCP port 711. These ports are
> opened on the router interface only when *mpls ip* is configured on the
> interface. The use of TCP as a transport protocol results in reliable
> delivery of LDP/TDP information with robust flow control and congestion
> handling mechanisms.
>
>
> If not, memorizing the port/protocol are the least of your worries. I
> can't stress enough to know the documentation front/back/side to side. You
> will run across a dozen topologies, put together in a mix that you will
> never see in the real world (and a lot that you will see). For this reason,
> look this stuff up. If you can't find it, google it. Use the Cisco link
> found and reverse engineer that link so you know how to find it as google
> won't be on your corner on lab day.
>
> Cheers! Happy labbing.
>
> Regards,
> Jay McMickle- CCIE #35355 (RS)
> Sent from my iPhone 5
>
> On Nov 24, 2012, at 12:22 PM, Tauseef Khan <tasneemjan_at_googlemail.com>
> wrote:
>
> Could some one please clarify. Which ports i need to allow for ldp neighbor
> relationship to come up.
> Is it tcp 646 or both tcp and udp 646.
> regards
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat Nov 24 2012 - 20:27:51 ART