Subject: RE: [pim] RP selection algorithm and BSR -ANYCASTing

From: "O.L.N.Rao" <[email-masked]>
Date: Mon, 05 Nov 2001 09:28:47 +0530

Hi All,

   ANYCAST funda in IPv6 is for sending to nearest one of the replica of systems.

   If there are replica of same system, AnyCast aims at unicasting to nearest/low cost one.

   IF IT IS SO,

       Consider the scenario where there are CRP1 and CRP2 who have overlapping
       in case of G1. i.e They both advertised the group in their CRP Advt.

       IF(we use the DRAFT-METHOD)   Solution is CLEAR

      IF(we use ANYCAST)
       
             IT is not necessary that all have nearest/low cost CRP same.
             THAT TOO, ANYCAST is dependent on ROUTING PROTOCOL.
             IT is the routing protocol which decides the nearest/low cost CRP.

             AS there is no restriction on ROUTING protocol to be used, definitely
               each protocol determine CRP in their own way, that may not be same
               if we run the other routing protocol on the same router.

             [ Similar to A Scenario of ASSERT - Where two downstream receivers have diff
               routing protocol running on them and learn different upstream neighbours]

      FINALLY COMING TO POINT,
   	There is definite outcome with AnyCast
 
   EXCUSE ME for any mistakes.  EXCUSE ME if my idea is totally wrong.

Thank You All,

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2001-11-03 02:25:34 AM, Leonard Giuliano <[email-masked]> wrote:

>
>Out of curiousity, why not do Anycast with static RP mapping?
>
>-Lenny
>
>On Fri, 2 Nov 2001, Jung Cyndi-ACJ099 wrote:
>
>*>
>*>>> certainly use a BSR - the flooding is a bear but it does work.
>*>
>*>>That's interesting. Do you have some (approximated) numbers and/or can
>*>>you elaborate a little bit more on that.
>*>
>*>>Pavlin
>*>
>*>We have a high degree of redundancy - that's where the BSR is less scalable
>*>than I would like.  Though it looks like Auto-RP would yield the same results,
>*>given our distribution of RP responsibility.
>*>
>*>Cyndi
>*>
>

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