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Re: [Roll] (Was: review of dao-projection -22)

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Wed, 19 January 2022 07:50 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] (Was: review of dao-projection -22)
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Subject: Re: [Roll] (Was: review of dao-projection -22)
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Hello Abdussalam

Possibly. We need a list of conditions we would advertise and of the different behaviours that would be expected when signaled…
Do you have a starting point?

Keep safe;

Pascal



From: Roll <roll-bounces@ietf.org> On Behalf Of Abdussalam Baryun
Sent: mercredi 19 janvier 2022 8:29
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: Re: [Roll] (Was: review of dao-projection -22)



On Fri, Jan 14, 2022 at 12:21 PM Pascal Thubert (pthubert) <pthubert=40cisco.com@dmarc.ietf.org<mailto:40cisco.com@dmarc.ietf.org>> wrote:
Dear all: we had this thread as part of Li’s review:


About “5.4 only the router with the lowest Interface ID in its registered address needs report the SIO, and the Root will assume symmetry.”

[Li] -> Is it possible to add a flag to indicate the symmetry? Otherwise, if A chooses B as sibling, but B doesn't choose A as sibling, Root may treat SIO from A as symmetry incorrectly when only receiving SIO from A.

[PT] we used to have that (B Flag for bidir) but we removed it for simplification. I’m OK to add it back, but we still lake a good description of how the node will know that the link is roughly symmetrical.

[Li] Some physical layer measurements such as RSSI/LQI have forward and reverse direction. Can it indicate symmetrical?
                  In layer 3, receiving DIO/NS messages from each other indicate symmetrical

[PT] There’s a nuance between bidir and symmetrical.  Maybe the ping works but the link quality is very different in both directions. If so the Rank increment computation would differ widely and we would need both sides.

At the moment the text says:
“
   B:  1-bit flag that is set to indicate that the connectivity to the
      sibling is bidirectional and roughly symmetrical.  In that case,
      only one of the siblings may report the SIO for the hop.  If 'B'
      is not set then the SIO only indicates connectivity from the
      sibling to this node, and does not provide information on the hop
      from this node to the sibling.
“

We need to clarify what the B flag means, when it can be set, and what is expected from the Root/ PCE about path computation when it is set or not set.

I think the flag needs more than two possibilities for connectivity issues, could we have two bits?

AB

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