[pim] Sticky PIM DR, should it be added to PIM DR improvements or different draft

"Mankamana Mishra (mankamis)" <mankamis@cisco.com> Thu, 03 December 2020 17:50 UTC

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From: "Mankamana Mishra (mankamis)" <mankamis@cisco.com>
To: "pim@ietf.org" <pim@ietf.org>
Thread-Topic: Sticky PIM DR, should it be added to PIM DR improvements or different draft
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Date: Thu, 3 Dec 2020 17:50:17 +0000
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Subject: [pim] Sticky PIM DR, should it be added to PIM DR improvements or different draft
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All,

https://tools.ietf.org/html/draft-ietf-pim-dr-improvement-10 draft briefly talks about PIM DR being sticky. But does not have much detail yet.  There are providers who do want to use Sticky PIM DR functionality. Since DR improvement talks about Hello options and carry elected PIM DR . There are two options.


  1.  Add new Sticky PIM DR procedures to this draft
  2.  Have new draft which talks only about sticky PIM DR without any hello option


Brief about Sticky PIM DR procedures

  1.  If Sticky DR is configured in PIM router , initial DR election happens it is defined in PIM RFC today.
  2.  To make sure now elected DR does not give up it DR role, now it will start advertising PIM_DR_MAX_Priority (this number to be reserved from DR priority value )
  3.  Now if any new router comes up, it will never try to take role of DR since at step2 elected DR was advertising highest priority.


This is the brief about what would go in draft.

Any input would be appreciated.

Mankamana