The MPLS-OPS Archive

[Puddinhead Wilson <puddinghead_wilson007@yahoo.co.uk>]

Let me try answering these:

 --- Muhammad Tahir <muhammadtahir2000@yahoo.com>
wrote: 
> Hi,
> I am begginer in MPLS field. I have just started
> reading MPLS. I have some questions (I tried to
> answer
> myself but i want to confirm/correct/verify them!!)
> 
> Q1: Why each LSP created is unidirectional?
> POSSIBLE ANSWER:
> It is hardware dependent or It depends upon the
> label
> distribution protocol e.g. in case of LDP it is
> unidirectional but in case of RSVP it is
> bidirectional? 


No. LSPs are unidirectional.

> 
> Q2: Upto what time LSP session persists? or in other
> words when and how LSP is terminated?
> POSSIBLE ANSWER:
> It is terminated when there is request of
> termination
> from upstream/downstream? (usual termination)
> It may terminate when there is link failure or
> device
> problem etc. (unusual termination).
> 

yes.

> Q3: LSP session is created for one time data
> transmission (e.g. of all the packets of one FEC)?
> or
> this session will continue for other packets which
> arrive when upstream was delivering data?
> 

I remember cisco had a jazzy time of day based LSPs
etc. From what I understand, if you club multiple
flows into an LSP, its called an FEC. You could make
an LSP per flow too.


> Thanks a lot
> 
> Tahir
> 
> 
> 
> 		
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