Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-ospfv3-lsa-extend-00.txt
Acee Lindem <acee.lindem@ericsson.com> Fri, 28 June 2013 21:19 UTC
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From: Acee Lindem <acee.lindem@ericsson.com>
To: Peter Psenak <ppsenak@cisco.com>, Acee Lindem <acee@lindem.com>
Thread-Topic: [OSPF] OSPFv3 LSA Extendibility - draft-acee-ospfv3-lsa-extend-00.txt
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Date: Fri, 28 Jun 2013 21:19:45 +0000
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Cc: "OSPF@ietf.org" <OSPF@ietf.org>
Subject: Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-ospfv3-lsa-extend-00.txt
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Great Peter - I'll discuss with my co-authors and update before cut-off. Thanks, Acee On 6/28/13 6:29 AM, "Peter Psenak" <ppsenak@cisco.com> wrote: >Hi Acee, > >On 28.6.2013 11:44, Acee Lindem wrote: >> Hi Anton, Peter, >> If I were to be convinced that #2 is the way to go, I like making it >>explicit configurations and only applicable to service provider and >>large enterprise deployments. That way, OSPFv3 implementations >>specifically for the homenet environments could omit it. > >I'm fine with the config based approach. > >thanks, >Peter > >> Thanks, >> Acee >> On Jun 28, 2013, at 4:00 AM, Anton Smirnov wrote: >> >>> Hi Acee, >>> while I appreciate developer's simplicity of option 1 this approach >>>is good only for greenfield deployment. For any existing sizable OSPFv3 >>>network its migration limitation may become an insurmountable obstacle. >>> My preference is combination of options: start migration as option >>>2 and when migration is completed lock on 1. >>> Benefits are that migration is possible; LSDB is doubled only for >>>period of migration; and once migration is completed there is no need >>>to worry about dynamics of old-style router entering the domain. >>> Downside is relative complexity of implementation but that's the >>>price to pay for simplicity of OSPFv3. BTW, entering and exiting >>>migration may be manual (via configuration), so this mixed approach may >>>be simpler to implement than 'pure' option 3. >>> Said all that, individual products targeting greenfield deployment >>>scenario may skip implementation of migration. Say, homenet may require >>>support of extended LSAs from day 1. That would mean that homenet >>>products will not be deployable in existing old-style-LSA networks - >>>but that probably is not the intent anyway. >>> >>> Anton >>> >>> >>> On 06/27/2013 10:18 PM, Acee Lindem wrote: >>>> I don't think there is much disagreement that we need a direct way to >>>> extend the base OSPFv3 LSAs and I will be presenting this draft at >>>>IETF >>>> 87 in Berlin. Where there appears to be some amount of disagreement is >>>> in the backward compatibility mechanisms. There are basically 3 >>>>options >>>> (as well as subtle variants) >>>> >>>> >>>> 1. The approach in the draft, only allow adjacencies between >>>> routers supporting the extended encodings. Backward compatibility >>>>would >>>> have to be provided with separate instances and topology. >>>> >>>> 2. Both the current and extended versions of the LSAs are >>>> originated as long as there are routers not supporting the new >>>>extended >>>> encodings at the respective flooding scope. This was the approach >>>>taken >>>> in "Multi-toplogy routing in OSPFv3 (MT-OSPFV3)", >>>> draft-ietf-ospf-mt-ospfv3-04.txt. However, it has the undesirable >>>> property of roughly doubling the size of the LSDB. >>>> >>>> 3. Switch to the extended format only after all the routers at >>>> the flooding scope support it. Use OSPF demand circuit-like (RFC 1793) >>>> signaling to determine whether or not all routers in the flooding >>>>scope >>>> support the new format. The only potential problem with this approach >>>>is >>>> a dynamics when a router not supporting the extended format >>>>successively >>>> leaves and enters the routing domain. >>>> >>>> What is the WG preference? I'm still in favor of the approach in the >>>> draft (#1) given the simplicity and stability properties. What we'd >>>>lose >>>> in slowed deployment would be more than made up standardization and >>>> availability. Also, it would satisfy the homenet requirements we >>>> desperately need to satisfy. >>>> >>>> Thanks, >>>> Acee >>>> >>>> >>>> >>>> _______________________________________________ >>>> OSPF mailing list >>>> OSPF@ietf.org >>>> https://www.ietf.org/mailman/listinfo/ospf >>>> >>> _______________________________________________ >>> OSPF mailing list >>> OSPF@ietf.org >>> https://www.ietf.org/mailman/listinfo/ospf >> >> >> > >
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Peter Psenak
- [OSPF] OSPFv3 LSA Extendibility - draft-acee-ospf… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Michael Barnes
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Peter Psenak
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Anton Smirnov
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Anton Smirnov
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Peter Psenak
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Mike Dubrovskiy (mdubrovs)
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Acee Lindem
- Re: [OSPF] OSPFv3 LSA Extendibility - draft-acee-… Michael Barnes