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LSP Termination

  • From: Muhammad Tahir <muhammadtahir2000@yahoo.com>
  • Date: Thu, 10 Feb 2005 05:13:58 -0800 (PST)
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  • Resent-Date: Thu, 10 Feb 2005 15:20:45 -0500
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Hi all,

Please tell me if i am wrong in answering these questions/also please indicate from where
can i read more about each question(drafts/rfc/book/articles etc).

1- LSP session remains for how much time or in other words upto what time LSP persists?
(possible answer): LSP between source and destination finishes, when packets of a certain
application (or FECs) reached at the destination. Other possiblity is, it continues until
some network failure occurs. 

2- If the source is delivering the last packets of one FEC (or application)to destination
and it receives some packets belonging to a new FEC or a new application for the SAME
destination. 
(possible answer): It will NOT terminate the first LSP and will continue for the new
packets by using the same LSP. 

3- When LSP is terminated? 
(possible answer): It is terminated when there is request from upstream or downstream.
(usual termination) or It may terminate when there is link failure or device problem etc.
(unusual termination). 

4- Is it terminated BY upstream or downstream in case of usual termination?
(possible answer): Both can request for LSP termination. 

5- How, in case of usual LSP termination, upstream or downstream requests for LSP
termination? (procedure?)
(possible answer): They use the LDP or RSVP procedures for this task. 

6- How LSRs come know that there is no more LSP in unusual termination?
(possible answer): They will come to know by the information provided by IGP. 

7- What the routers will do in case of LSP usual and unusual termination?
(possible answer): They will withdraw the labels. 

8- How usual LSP termination takes place? By label distribution protocols e.g. LDP or
LSVP etc. 
(possible answer): In case of LDP and RSVP, LSP will continue until node failure or link
failure occurs. 

Thanks

Tahir


		
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