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Re: [GROW] [Idr] RFC7854: EoR

"Tim Evens (tievens)" <tievens@cisco.com> Fri, 23 September 2022 00:03 UTC

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From: "Tim Evens (tievens)" <tievens@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>, Zhuangshunwan <zhuangshunwan@huawei.com>
CC: Luuk Hendriks <luuk@nlnetlabs.nl>, Maximilian Wilhelm <max@rfc2324.org>, John Scudder <jgs@juniper.net>, Paolo Lucente <paolo@ntt.net>, "grow@ietf.org" <grow@ietf.org>
Thread-Topic: [GROW] [Idr] RFC7854: EoR
Thread-Index: AQHYxubzuadynDm96kKEM7KBZVjVvq3cQMuAgAMDKACAACbKAIAAJTaAgAJMpgCABUylboACp1GAgAH8n4CAAGSk1g==
Date: Fri, 23 Sep 2022 00:02:49 +0000
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References: <bd7c5fb4-b398-c979-6f6b-0de82fd2ee12@bernat.ch> <dba40193-138e-5981-a4c2-6fc44fadde51@bernat.ch> <20220912203612.GA18968@pfrc.org> <6CB8C0EB-DC6E-48A8-993A-C98DEBD0D04A@juniper.net> <463DBA4E-3136-4A0F-A298-D081FEB123EB@pfrc.org> <20220914230819.GD27304@principal.rfc2324.org> <20220916101510.GA1365691@corley.shackle.nl> <MW3PR11MB4651FA81C4FC0E6C0F488DB4B64D9@MW3PR11MB4651.namprd11.prod.outlook.com> <058bcd84a50a4f3fa3fee62d0cf74da6@huawei.com> <0496725C-927F-4E62-9542-2C35874C8FDE@pfrc.org>
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Subject: Re: [GROW] [Idr] RFC7854: EoR
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When I wrote route-refresh, that was from the router/sender side, not BMP receiver sending a route-refresh. BMP is still write-only.

There are use-cases for re-syncing the RIB to the BMP receiver.  Some of the methods today are to clear the peer, request a route-refresh in, or to reset the BMP feed. This is a bit intrusive to the router (sender) and BMP receiver. Having to go to the router to request a refresh to the BMP server, IMO, is still okay.  The problem is that control knobs for refresh are at the BGP peer level, not BMP.  For Adj-RIB-In Pre-Policy, it makes sense to do that on the peer, but for Post-Policy, Adj-RIB-Out and Local-RIB, it doesn’t really make sense.  Having a knob to initiate BMP side refresh would be very nice and hopefully less intrusive.

Regardless of the BMP server needing a refresh, a BMP server does not know when someone has requested route-refresh IN at the peer level (maybe it was requested for policy change, …) Instead, the BMP receiver, blindly, receives a boat load of updates with no awareness that it was a new RIB dump or controlled refresh. In this case, it would appear to be churn.  IMO, there is value in having a message to signal the receiver that a refresh is coming, followed by an EoR.  A PEER_UP could be used for this, but that is intrusive and misuse of PEER_UP.

--Tim

On 9/22/22, 11:03 AM, "Jeffrey Haas" <jhaas@pfrc.org> wrote:



> On Sep 21, 2022, at 7:42 AM, Zhuangshunwan <zhuangshunwan=40huawei.com@dmarc.ietf.org> wrote:
>
> Hi Tim and All,
>
> I think the idea of a "BMP route refresh" would be appreciated,  it will helps keep the information synchronized between the BMP Server and the BMP Client.

Would someone clarify what they mean by a bmp route refresh?

The BMP protocol was intentionally designed as write-only.

-- Jeff

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