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Re: [v6ops] Flash renumbering

Philip Homburg <pch-v6ops-9@u-1.phicoh.com> Tue, 22 September 2020 11:44 UTC

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From: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>
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References: <8f964b8650cd4b619ff47aed5b07bc67@huawei.com> <7ef6cbcc-164f-383c-658b-b3c0df859535@go6.si> <1af87e24-1410-8f89-b50d-9c61694e4644@foobar.org> <f97b7ac2-0b36-2fae-58fd-eddee6f8b408@gmail.com> <76f10fa7030044c4a0b71443fde92f24@huawei.com> <CAHL_VyC7u7bNJD9pUzbFTrBtifbCVmQtPn4YHHs5g7T6omKwLQ@mail.gmail.com> <2e11a0315196499c81b72c171e014650@huawei.com> <EB3611C3-8849-4670-AFAD-4924AC79E26A@fugue.com> <93e01391b78b4c19be87f58f68281cbf@huawei.com> <CAHL_VyDhUO9mMTXEB1Z53-sA4KtHMu4-vdB0zb-oukanmEdARw@mail.gmail.com> <5b2f71a95a7944f0bcda368c11c6d7a2@huawei.com> <CAHL_VyDP-w9LzQTCkQM-tyjVo+T982aazFJTWeNPvGqHSHRtgQ@mail.gmail.com> <6f5fabd632fb4954adc13ea805be3c0b@huawei.com> <CAHL_VyDO_DTtE2Uj-T2f=a4wdJ2QtNrtO8YwMS88rZtcit5MrQ@mail.gmail.com> <b18832ca2efb44d59d2186863f56481b@huawei.com>
In-reply-to: Your message of "Tue, 22 Sep 2020 10:17:12 +0000 ." <b18832ca2efb44d59d2186863f56481b@huawei.com>
Date: Tue, 22 Sep 2020 13:44:27 +0200
Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/eNBy8_F1GDRhwIVWbTKSTHVNJX8>
Subject: Re: [v6ops] Flash renumbering
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>    We are talking about the situation of uplink lost, then Router
>    could continue sending old PIOs, but inform hosts that this
>    router is not default anymore (router lifetime 0).

If it is a simple router with one uplink and one downlink it makes sense to
do so. If it isn't already in the CPE requirements then it make sense to do
so.

If there are multiple downstream subnets and the router announces a ULA,
then it becomes more complex because for the ULA, the router is still a
default router.

One option would be to change the priority of the router, but that would
make address section more complex in the case of a multi-homed network.

One option would be to move away from default routers and only have 
Route Information Options (RFC 4191).

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