Re: [Idr] WG LC for draft-ietf-idr-bgp-open-policy-10.txt (6/4 to 6/18)(.
Alexander Azimov <a.e.azimov@gmail.com> Tue, 16 June 2020 20:00 UTC
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From: Alexander Azimov <a.e.azimov@gmail.com>
Date: Tue, 16 Jun 2020 22:59:48 +0300
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To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: Pavel Lunin <plunin@plunin.net>, "idr@ietf. org" <idr@ietf.org>, Susan Hares <shares@ndzh.com>
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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-open-policy-10.txt (6/4 to 6/18)(.
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Dear colleagues, In the last days, I have accumulated comments that were received both on-list and off-list. I'd like to thank all who contributed to the improved quality of the document. Accompanied by minor changes there are two important edits that I'd like to highlight: - We clearly specified the scope of the Roles configuration: 'BGP Roles SHOULD be configured on each eBGP session between ISPs that carry IPv4 and(or) IPv6 unicast prefixes'. In section 8 there is also an explicit statement that the applicability of Roles for other address families is out of scope of this document. - The registry for Roles now has three parts: Expert Review (0-127), First Come First Served (128-251), and Experimental Use (252-255). The statement is added that guarantees that newly defined roles will not pair with Roles defined in the draft. Since these changes don't affect the OTC/Role mechanics no changes and needed in the implementations. The new version of the draft is available: https://tools.ietf.org/html/draft-ietf-idr-bgp-open-policy-11 пт, 12 июн. 2020 г. в 20:47, Gyan Mishra <hayabusagsm@gmail.com>: > Hi Susan > > I agree with Pavel’s important point in the draft in that this feature > would be for “inter domain” which from internet perspective would be ASBRs > ties interconnection between providers thus “eBGP” only and could be over > AFI/SAFI 1/1 2/1 1/128 2/128. > > I mention the SAFI 128 as the internet has mix of carriers having internet > table carried in 3 scenarios — global table IP backbone, global table over > mpls, IP VPN. In the IP VPN case their are providers that segregate global > table to be clean of customer routes with only connected interfaces IGP for > P,PE,RR reachability and Internet table carried in a dedicated internet > VRF. In those cases inter-as carriers may do mpls inter-as option or if IP > only an IP based bgp policy. Their maybe some cases but less often where > MPLS is used over internet and public internet and private is carried over > the same MPLS transport. > > Those permutations of the operators network inter-as types maybe important > to mention as may impact the use of role feature. > > The main use case is for internet providers but could be used for large > enterprises as well. > > Once vendors implement the feature any operator can use for any use case > so which is why it’s critical to keep disabled by Default. > > That being said we would not want the role priority feature to be Default > enabled since you cannot distinguish eBGP or iBGP from a MP reach > capability standpoint it really has to be disabled by Default. This would > allow in a controlled fashion by operators to enable on their “inter-as” > ASBR-ASBR boundary ties only. > > Kind Regards > > Gyan > > On Wed, Jun 10, 2020 at 9:02 PM Pavel Lunin <plunin@plunin.net> wrote: > >> Hi Susan, >> >> 1) I support the advancement of this draft to publication. >> >> A little comment though. The so called "Gao-Rexford model" and more >> generally role-based relationships logic is mostly applicable to eBGP >> sessions. iBGP sessions are usually 'complex' in terms used in this >> document, so assigning roles to iBGP speakers seems practically >> unnecessary. From the implementation point of view it doesn't change a lot: >> ability to assign roles to iBGP speakers doesn't seem to make any harm, and >> having the option of not assigning the roles lets the network operators >> make the decision whether they want to change the today's behavior of iBGP >> default policies. >> >> However from the operational point of view it's somewhat unclear if >> authors propose to configure roles on iBGP sessions. The general term "BGP" >> is used everywhere throughout the document (with an exception of only one >> occurrence), so it might seem that the document recommends to set the roles >> on all iBGP sessions as well as eBGP. Here it might look evident that the >> general context is inter-domain routing, so the document covers eBGP. >> However the potential audience of this document is very broad, including >> people not very experienced in BGP operational practices (this is were >> route leaks often come from) so I would suggest to make this point more >> explicit. Probably some occurrences of the word 'BGP' should be replaced by >> 'eBGP' or just a little sentence/paragraph is needed to make this point >> clearer. >> >> > By default, strict mode SHOULD be set to false for backward >> compatibility with BGP speakers that do not yet support this mechanism. >> Same here. "Backward compatibility" suggests that in future all or almost >> all BGP sessions should be configured with roles while it's not totally >> correct: iBGP speakers won't probably ever need roles and role-based >> policies. >> >> This being said, this nuance only affects operational practice >> recommendations. Protocol behavior specification, as defined by the >> document, looks good: both eBGP and iBGP can be configured with roles if >> needed. >> >> 2) Deployments of this extension will be valuable for almost all use >> cases where eBGP is used to exchange public Internet routes. >> >> >> Kind regards, >> Pavel >> >> >> Please comment on the following questions: >> >> 1) Is this specification ready for publication? >> >> 2) Are there deployments where this BGP protocol extension is valuable? >> >> 3) Do you believe the error code handling is ready for publication? >> >> >> >> The shepherd for this draft is Susan Hares. >> >> During the WG LC, the shepherd’s report will be sent. >> >> >> >> Cheers, >> >> >> >> >> >> >> _______________________________________________ >> Idr mailing list >> Idr@ietf.org >> https://www.ietf.org/mailman/listinfo/idr >> > -- > > <http://www.verizon.com/> > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > _______________________________________________ > Idr mailing list > Idr@ietf.org > https://www.ietf.org/mailman/listinfo/idr > -- Best regards, Alexander Azimov
- [Idr] WG LC for draft-ietf-idr-bgp-open-policy-10… Susan Hares
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Jeff Tantsura
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Brian Dickson
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Sebastian Becker
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Borchert, Oliver (Fed)
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Pavel Lunin
- [Idr] 答复: WG LC for draft-ietf-idr-bgp-open-polic… Aijun Wang
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Dmitry Afanasiev
- Re: [Idr] 答复: WG LC for draft-ietf-idr-bgp-open-p… Randy Bush
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Sriram, Kotikalapudi (Fed)
- Re: [Idr] 答复: WG LC for draft-ietf-idr-bgp-open-p… Pavel Lunin
- Re: [Idr] 答复: WG LC for draft-ietf-idr-bgp-open-p… Alexander Azimov
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Susan Hares
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Alexander Azimov
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Alexander Azimov
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Pavel Lunin
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Andrei Robachevsky
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Pavel Lunin
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Gyan Mishra
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Luuk Hendriks
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Sriram, Kotikalapudi (Fed)
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Andrei Robachevsky
- Re: [Idr] WG LC for draft-ietf-idr-bgp-open-polic… Susan Hares