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What is the bad tspec?

  • From: David Charlap <david.charlap@marconi.com>
  • Date: Wed, 03 Jul 2002 14:32:14 -0400
  • User-Agent: Mozilla/5.0 (Windows; U; WinNT4.0; en-US; rv:1.1a+) Gecko/20020626

Hong Liao wrote:
>> 
>> Keep in mind that a huge value in the TSPEC may not cause a PathErr.
>> Until the Resv message arrives from downstream, the actual size of the
>> reservation could be any value between zero and the value of the TSPEC.
>> 
>> If the FLOWSPEC in the Resv is too large, then a PathErr is mandatory.
> 
> If there is something wrong in the resv msg, it should
> send the ResvErr instead of Patherr, right?

In straight RSVP, yes.  But in section 4.7.3 of RFC 3209, that changed.

Note the sixth paragraph of that section:

     If the requested bandwidth is not available a PathErr message is
     returned with an Error Code of 01, Admission Control Failure and an
     Error Value of 0x0002.  ...

In other words, for LSP-type sessions, PathErr should be generated if 
resources are unavailable.

-- David