Re: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-13.txt
"Acee Lindem (acee)" <acee@cisco.com> Mon, 22 February 2021 14:19 UTC
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>
CC: "lsvr@ietf.org" <lsvr@ietf.org>
Thread-Topic: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-13.txt
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Date: Mon, 22 Feb 2021 14:19:00 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsvr/__b3oLaN4jrkKFhi0uMxpgJS3Fo>
Subject: Re: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-13.txt
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This version handles Alvaro's comments that were missed in -12 that don't require further discussion. [minor] "IPv6 and IPv4 can be supported in the same address family" This sounds as if you're calling IPv4/IPv6 the same AF...when you're really referring to the transport of the information. Please put a forward reference to where this claim is specified. We will add this reference in the next revision. Added in -13. [minor] "IPv6 and IPv4 can be supported in the same address family" This sounds as if you're calling IPv4/IPv6 the same AF...when you're really referring to the transport of the information. Please put a forward reference to where this claim is specified. We will add this reference in the next revision. Added in -13. [major] §5 talks about SPF running only for nodes that advertised the same SFP Algorithm as the local node...so just advertising this TLV is not enough. At least add a forward reference to §5. Reference will be added in the next revision. Added in -13. [minor] s/The prefix metric attribute TLV/The Prefix Metric TLV Will be included in next revision. Fixed in -13. [] "If by some chance the BGP Speaker is deployed long enough..." I love positive thinking. :-( This is the law of large numbers - it will never happen. We will remove this statement in the next revision. The range is 0 - 18446744073709551615. At one self-origination per milli-second, it will still takes 10's of millions of years. Removed in -13. [nit] s/When BGP speaker/When a BGP SPF speaker This was missed and will be fixed in the next revision. This was already fixed in -12. [] Please remove the sentence about the NEXT_HOP and focus all discussion about it in §5.4. We missed this and it will be in the next revision. This is removed and a reference was added. [minor] "the SPF or best-path" I guess you meant simply the SPF calculation. We will change this in the next revision. This was already fixed in -12. [minor] s/BGP-LS domain/BGP SPF domain This will be changed in the next revision. Fixed in -13. [major] "list of candidate Node NLRI" Where does this list come from? Is it the outcome of the rules in §5.1? The NLRI selected during 5. are eligible to be added. Will add a reference in the next revision. Added in -13. [major] "configurable period of time, e.g., 2-3 seconds" Please define a timer and set a default. We indicate this is implementation dependent. We could revise in the next revision. Timers are added in -13. 787 Similarly, when a prefix becomes unreachable, a more recent version 788 of the BGP-LS Prefix NLRI will be advertised with the SPF Status TLV 789 Section 4.3.1 indicating the prefix is unreachable in the BGP-LS 790 Prefix Attributes and the prefix will be considered unreachable with 791 respect to BGP SPF. After some configurable period of time, e.g., 792 2-3 seconds, the BGP-LS Prefix NLRI can be withdrawn with no 793 consequence. If the prefix becomes reachable in that period, the 794 originator of the BGP-LS Prefix NLRI will simply advertise a more 795 recent version of the BGP-LS Prefix NLRI without the SPF Status TLV 796 in the BGP-LS Prefix Attributes. [] Same comments... Need to add "SHOULD" here in the next revision. Changed in -13. [minor] "brief configurable interval, e.g., 2-3 seconds" Can we use the same timer as before? We indicate this is implementation dependent. I guess will add these timers in the next revision (or a future revision). Timers added in -13. [major] Route origin validation (and BGPSec) don't apply to BGP SPF. Whatever door those mechanisms were meant to close are still open in BGP SPF. Specifically, there's no verification about the origination of prefixes: anyone can advertise a prefix --- with the proper metric it can result in erroneous traffic delivery. We will say BGPSec is not applicable in the next revision. This was already fixed in -12. Thanks, Acee On 2/22/21, 9:16 AM, "Lsvr on behalf of internet-drafts@ietf.org" <lsvr-bounces@ietf.org on behalf of internet-drafts@ietf.org> wrote: A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Vector Routing WG of the IETF. Title : BGP Link-State Shortest Path First (SPF) Routing Authors : Keyur Patel Acee Lindem Shawn Zandi Wim Henderickx Filename : draft-ietf-lsvr-bgp-spf-13.txt Pages : 37 Date : 2021-02-22 Abstract: Many Massively Scaled Data Centers (MSDCs) have converged on simplified layer 3 routing. Furthermore, requirements for operational simplicity have led many of these MSDCs to converge on BGP as their single routing protocol for both their fabric routing and their Data Center Interconnect (DCI) routing. This document describes extensions to BGP to use BGP Link-State distribution and the Shortest Path First (SPF) algorithm used by Internal Gateway Protocols (IGPs) such as OSPF. In doing this, it allows BGP to be efficiently used as both the underlay protocol and the overlay protocol in MSDCs. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsvr-bgp-spf/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsvr-bgp-spf-13 https://datatracker.ietf.org/doc/html/draft-ietf-lsvr-bgp-spf-13 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsvr-bgp-spf-13 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ Lsvr mailing list Lsvr@ietf.org https://www.ietf.org/mailman/listinfo/lsvr
- [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-13.txt internet-drafts
- Re: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-13… Acee Lindem (acee)