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Targetted Hello - LDP Specification Draft

  • From: "Amarnath Honnavalli Anantharamaiah" <amarnath.honnavalli@wipro.com>
  • Date: Fri, 08 Dec 2000 18:06:39 +0530

Hi,

Common Hello parameters TLV

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0|0| Common Hello Parms(0x0400)|      Length                   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Hold Time                |T|R| Reserved                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 

[1] Why do we need R bits explicitly in Common Hello parameters TLV. ?
          R- A value of 1 reuest the receiver to send periodic Targeted Hellos to the source of this Hello. a value of 0 makes no request.

As far as I understand, we have to send Hello message(even targetted hello) periodically, if it is configured to send Targetted Hello. How does this R bit help ???
 

Thanks in advance
Amar