having said that, Les, if you write quickly a draft on "IIH link capability TLV" (since we already have a link capability RFC but only in 22) I'm more than happy to grab a bit there (or help you with the draft itself) rather than defining it in this draft. I see already other interesting thing like .e.g advertising MTUs in it to prevent the problems we are fighting using padding (and maybe things like v4/v6 forwarding capability to deal with prefix/nexthop variations, BFD capability for auto-config and other ideas) ...
-- tony On Fri, Jul 17, 2026 at 9:10 AM Tony Przygienda <[email protected]> wrote: > > > ---------- Forwarded message --------- > From: Tony Przygienda <[email protected]> > Date: Fri, Jul 17, 2026 at 9:10 AM > Subject: Re: [Lsr] Comments on draft-prz-lsr-ash-packets-00 > To: Les Ginsberg (ginsberg) <[email protected]> > > > > > On Fri, Jul 17, 2026 at 3:31 AM Les Ginsberg (ginsberg) <ginsberg= > [email protected]> wrote: > >> 1)I see you have now defined a TLV for hellos to advertise the capability >> to support ASH >> >> >From Section 5.1: >> >> " The ASH Capability TLV is a zero-length TLV (type TBD) included in IIH >> PDUs." >> >> I ask that you consider defining something more generic/extensible so >> that we can use the same TLV codepoint to advertise other per link >> capabilities in the future (yes - I have some in mind...) >> The TLV would be formatted analogous to the IPv4/IPv6 Extended >> Reachability Attribute Flags sub-TLV defined in RFC 7794 - but would be a >> TLV (not a sub-TLV) only to be sent in hellos. >> >> Link Capability TLV >> Type - TBD >> Length - Number of octets in the Value field >> Value - Extensible bit string >> >> We create a registry to define the bit assignments. You get the first bit >> (or perhaps two bits if you want to advertise ASH support per level). >> >> This is more flexible and forward looking. >> > > Les, sure, easily done. > >
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