> I have a couple of questions on the draft:
Sorry for the delay...
These are good questions.
> 1. what should a host do when it receives an RA with the preference
> field being set to 10 (i.e. reserved)?
> - ignore the entire RA.
> - accept the RA, but consider the preference value as
> another value?
> if so, high/medium/low?
> - other option?
How about, treat the RA as if the RouterLifetime field is zero. I think
this will produce the best compatibility with future use of the reserved
preference value.
> 2. if the preference value for a router changes, does/should it
> affect existing destination cache entries? For example, consider
> the following scenario:
> - a host H receives an RA from a router R1 with the medium
> preference.
> - H sends a packet to an off-link destination D. H uses R as the
> next hop, and records H in the destination cache.
> - a host A then receives an RA from another router R2 with the high
> preference.
> now, what should happen on the destination cache for D in H?
> Should it be removed once, prompting H to do next hop determination
> again (and to choose the more preferred router R2). Or, should H
> just keep the old cache and its next hop until it becomes
> unreachable?
I think this is a quality of implementation issue that can be left
unspecified.
My implementation will invalidate the destination cache appropriately
when the routing table changes.
Rich
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