les, there is explicit statement and implicit statements.
it is correct that you have not made an explicit statement that IPv6 is less important than IPv4 and yet there is your last quote which implicitly makes me think so. | I can imagine cases in which the per AF enabling might make sense (e.g. | when the network associated w one address family is deemed | non-critical). so can you clarify this use-case where a SP wants to have IPv4 protected and not IPv6 in the default topology. why would this make sense / why would a knob for this make sense ? /hannes On Tue, Feb 24, 2015 at 04:05:03PM +0000, Les Ginsberg (ginsberg) wrote: | Hannes - | | It would be good if you did not attribute statements to me that I did not make. I made no statement about the importance of one address family over another. Please do not attempt to create controversy by misrepresenting what I wrote. | | I do like popcorn though - so if you really are going to make some - count me in. :-) | | Les | | | > -----Original Message----- | > From: Hannes Gredler [mailto:[email protected]] | > Sent: Tuesday, February 24, 2015 7:04 AM | > To: Acee Lindem (acee) | > Cc: Les Ginsberg (ginsberg); [email protected]; Pushpasis | > Sarkar; Jeff Tantsura; [email protected] | > Subject: Re: LFA manageability : per AF config => feedback required | > | > HG> that IPv6 is less critical than IPv4 ? - | > the IESG review will be a lot of fun then - i'll make some popcorn ... | > | > On Mon, Feb 23, 2015 at 06:26:15PM +0000, Acee Lindem (acee) wrote: | > | I agree with Les. | > | Acee | > | From: "Les Ginsberg (ginsberg)" <[1][email protected]> | > | Date: Monday, February 23, 2015 at 10:55 AM | > | To: Stephane Litkowski <[2][email protected]>, Pushpasis | > | Sarkar <[3][email protected]>, Jeff Tantsura | > | <[4][email protected]>, Routing WG <[5][email protected]> | > | Subject: RE: LFA manageability : per AF config => feedback required | > | | > | Stephane – | > | | > | | > | | > | I can imagine cases in which the per AF enabling might make sense (e.g. | > | when the network associated w one address family is deemed | > | non-critical). | > | | > | | > | | > | Section 5.1 is a SHOULD – as is most of the document. It is therefore | > | a suggestion as to what an implementation should provide. If a given | > | implementer thinks this is either too onerous or not useful they can | > | omit it w/o being in violation. But I see no reason to eliminate this | > | – and in actual practice I would expect the cost of supporting such a | > | knob to be low cost. It is hard for me to see this as controversial. | > | | > | | > | | > | Les | > | | > | | > | | > | | > | | > | From: [6][email protected] | > | [[7]mailto:[email protected]] | > | Sent: Sunday, February 22, 2015 11:10 PM | > | To: Les Ginsberg (ginsberg); Pushpasis Sarkar; Jeff Tantsura; | > | [8][email protected] | > | Subject: RE: LFA manageability : per AF config => feedback required | > | | > | | > | | > | [Les:] I think your point here is that the LFA calculation is AF | > | independent within a given topology – but resources are consumed | > | independent of how many computations are required- giving an | > operator | > | the ability to determine which prefixes are most critical seems useful. | > | That could be per AF or per prefix. | > | | > | | > | | > | [SLI] Agree but is the “resource saving” point strong enough to | > | mandate per AF activation ? | > | | > | | > | | > | From: Les Ginsberg (ginsberg) [[9]mailto:[email protected]] | > | Sent: Monday, February 23, 2015 05:01 | > | To: Pushpasis Sarkar; Jeff Tantsura; LITKOWSKI Stephane SCE/IBNF; | > | [10][email protected] | > | Subject: RE: LFA manageability : per AF config => feedback required | > | | > | | > | | > | Pushpassis - | > | | > | | > | | > | From: rtgwg [[11]mailto:[email protected]] On Behalf Of | > Pushpasis | > | Sarkar | > | Sent: Friday, February 20, 2015 3:28 AM | > | To: Jeff Tantsura; [12][email protected]; | > [13][email protected] | > | Subject: Re: LFA manageability : per AF config => feedback required | > | | > | | > | | > | HI Jeff et al, | > | | > | | > | | > | I can think of a reason to have a knob per-level(or per-area) or per | > | ISIS topology(note in ISIS a topology in ISIS always corresponds to a | > | single AF,) | > | | > | | > | | > | [Les:] This is a common mistake to make. If one simply uses RFC 5308, | > | then IPv6 prefixes can be advertised in the same topology as IPv4 (MTID | > | #0) – and there are implementations which support this. More | > | generally, from the protocol’s POV a given topology can support any | > | combinations of address families. It is only a convention because of the | > | reserved MTIDs specified in RFC 5120 that certain MTIDs are “IPv6 | > | only”. But if one looks at the protocol capabilities such a | > | restriction does not exist in general. | > | | > | | > | | > | Interestingly you contradicted yourself below. J | > | | > | But I did want to set the record straight on this point – hopefully we | > | are in agreement. | > | | > | | > | | > | and per realm and topology in OSPF. But I cannot think of a reason of | > | why within the same topology we need another set of knobs for each | > AF. | > | Here, by AF I understand IPV4 or IPv6. | > | | > | | > | | > | When both IPV4 and IPV6 are part of the same IGP topology, there is | > only | > | one set of backup computations needed to protect both IPV4 and IPv6 | > | traffic. | > | | > | | > | | > | Also I cannot think of any motivation for an operator to turn on | > | protection on only one AF and does not want to turn on for the other | > | even if both AFs has been deployed for normal forwarding. | > | | > | | > | | > | [Les:] I think your point here is that the LFA calculation is AF | > | independent within a given topology – but resources are consumed | > | independent of how many computations are required- giving an | > operator | > | the ability to determine which prefixes are most critical seems useful. | > | That could be per AF or per prefix. | > | | > | | > | | > | Les | > | | > | | > | | > | Thanks | > | | > | -Pushpasis | > | | > | | > | | > | From: Jeff Tantsura <[14][email protected]> | > | Date: Friday, February 20, 2015 at 12:59 PM | > | To: "[15][email protected]" | > | <[16][email protected]>, "[17][email protected]" | > | <[18][email protected]> | > | Subject: Re: LFA manageability : per AF config => feedback required | > | | > | | > | | > | Hi Stephane, | > | | > | | > | | > | /chair hat off | > | | > | | > | | > | IMO in disjoined topologies one should have flexibility to | > | enable/disable LFA as per AF. | > | | > | | > | | > | | > | | > | Cheers, | > | | > | Jeff | > | | > | | > | | > | From: "[19][email protected]" | > | <[20][email protected]> | > | Date: Thursday, February 19, 2015 at 11:21 PM | > | To: "[21][email protected]" <[22][email protected]> | > | Subject: LFA manageability : per AF config => feedback required | > | | > | | > | | > | Hi Folks, | > | | > | | > | | > | As you know, LFA manageability draft is in final phasis | > | | > | The current document states per AF granularity activation as a SHOULD. | > | | > | “ | > | | > | [23]5.1. LFA enabling/disabling scope | > | | > | | > | | > | | > | | > | The granularity of LFA activation should be controlled (as alternate | > | | > | nexthop consume memory in forwarding plane). | > | | > | | > | | > | An implementation of LFA SHOULD allow its activation with the | > | | > | following criteria: | > | | > | | > | | > | o Per address-family : ipv4 unicast, ipv6 unicast, LDP IPv4 unicast, | > | | > | LDP IPv6 unicast ... | > | | > | | > | | > | o Per routing context : VRF, virtual/logical router, global routing | > | | > | table, ... | > | | > | | > | | > | “ | > | | > | | > | | > | In the framework of ISIS/OSPF yang modelization, we are challenging | > | this statement, do we really need to force implementation to support | > | this “per AF” granularity ? | > | | > | | > | | > | Please provide as soon as possible your feedback on this and also | > | provide clear drivers to support or not per AF activation of LFA. | > | | > | | > | | > | | > | | > | Thanks for your help ! | > | | > | | > | | > | | > | | > | [24]Orange logo | > | | > | | > | | > | Stephane Litkowski | > | Network Architect | > | Orange/SCE/EQUANT/IBNF/ENDD/NDE | > | | > | Orange Expert Future Networks | > | | > | phone: [25]+33 2 23 28 49 83 | > | mobile: [26]+33 6 37 86 97 52 | > | [27][email protected] | > | | > | | > | | > | | > | | > | | > __________________________________________________________ | > __________________________________________________________ | > _____ | > | | > | | > | | > | Ce message et ses pieces jointes peuvent contenir des informations | > confidentielles ou privilegiees et ne doivent donc | > | | > | pas etre diffuses, exploites ou copies sans autorisation. 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