Re: [OSPF] OSPFv3 Extended LSAs TLV-level "disposition-if-unsupporetd indicator"?
David Lamparter <equinox@diac24.net> Tue, 06 August 2013 14:22 UTC
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Date: Tue, 06 Aug 2013 16:21:49 +0200
From: David Lamparter <equinox@diac24.net>
To: Acee Lindem <acee.lindem@ericsson.com>
Message-ID: <20130806142149.GK95257@jupiter.n2.diac24.net>
References: <20130806134954.GJ95257@jupiter.n2.diac24.net> <94A203EA12AECE4BA92D42DBFFE0AE4702FEA381@eusaamb101.ericsson.se>
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Subject: Re: [OSPF] OSPFv3 Extended LSAs TLV-level "disposition-if-unsupporetd indicator"?
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On Tue, Aug 06, 2013 at 02:16:10PM +0000, Acee Lindem wrote: > I don't think this is a good idea at all. An implementation can only > deal with the TLVs it understands so the ignore options don't make > sense. > If the other actions are necessary, we'd be better served with a more > definitive use case and encoding than reusing TLV bits. Section 3 of the draft states: [...] Unrecognized types are ignored. How does that make sense then? Did I misunderstand that sentence? -David > On Aug 6, 2013, at 9:49 AM, David Lamparter wrote: > > 00 - ignore TLV > > this can be used for all "hint" TLVs, stuff like maybe communicating > > the origin ASN for external routes or whatever you can dream up. > > > > 01 - ignore parent > > on calculating SPF, completely ignore the resulting route. This is > > useful for MT-OSPF (if it ever happens), to be used on a MT-ID TLV > > with an MT-ID != 0. Basically, non-MT routers can ignore all nonzero > > MT topologies this way. > > > > 10 - strong unreachable > > mark the route's destination prefix as unreachable and install a > > corresponding blackhole/... route. This is the right thing to do on > > SADR routes when they hit a non-SADR router. Even if we have the same > > prefix reachable on a non-SADR route with a lower metric, we can't > > ensure that it's loop-free for a particular source address. > > > > 11 - weak unreachable (?) > > treat the route as "unreachable", adding it to the SPF result as such, > > if there is no shorter path to the same prefix so far. This is > > probably the least useful type, I can only come up with something like > > "route that requires special encapsulation (tunnel?)" - no idea on the > > reality here.
- [OSPF] OSPFv3 Extended LSAs TLV-level "dispositio… David Lamparter
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Acee Lindem
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… David Lamparter
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Russ White
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Acee Lindem
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… David Lamparter
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Acee Lindem
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Russ White
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… A. Przygienda
- Re: [OSPF] OSPFv3 Extended LSAs TLV-level "dispos… Peter Psenak