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LSP Preemption

  • From: Gopalkrishna Panicker <gopanicker@yahoo.com>
  • Date: Wed, 9 Oct 2002 11:27:31 -0700 (PDT)

Hi,

As a part of path admission control a router upon
receipt of a path message decides if it has 
sufficient resources to accommodate this session. 
This decision may involve bumping other low priority
sessions.

>From reading the archives I gather this bumping is
actually done when the corresponding Resv message
arrives. I assume this is when the appropriate
PathErr/ResvErr is sent. 

My question is, in a intermediate or transit router
do we delete the old reservation (of the bumped lsp)
at the time we send the error message. How does one
recover should this error message be lost ? 

Another related question, are reservations torn down
when we recv a Resv Err/Path error message or should  

we wait for the path/resv tear to do this. RFC 2209
suggests the later.

Cheers,
Gopal



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