[Idr] Growing BGP-LS Attribute
Robert Raszuk <robert@raszuk.net> Sat, 20 October 2018 12:10 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Sat, 20 Oct 2018 14:10:22 +0200
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To: ketant@cisco.com
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Subject: [Idr] Growing BGP-LS Attribute
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Hi Ketan, So today I see bunch of new proposals requesting addition of number of new TLVs to BGP-LS Attribute. Some of them will go into attribute along with Node NLRI and some with Link NLRI. I think by all means this is the largest single BGP attribute we ever had and it seems growing daily like a balloon. Most of the TLVs which are defined contain sub-TLVs which can be filled with data in a non limited by any spec fashion. Just few questions: * What happens when someone injects more then 4K of data into this attribute today ? What prevents one from doing so ? * Is attribute discard an acceptable thing for someone who counts of that information operationally simple due to a bug in a new TLV ? * So far error handling proposal stopped at the attribute boundary as most BGP attributes are small, precisely addressing the problem they were invented to solve. Here we are facing a completely different situation .. * Is it acceptable to loose all other address family information if BGP-LS Attribute error or its size impacts the propagation to the extend of bringing down the session ? * What is the limiting factor of the BGP-LS churn (due to the nature of some carried data being quite dynamic) to other address families present either on sender, receiver or route reflector ? Below is the current IANA registry with BGP-LS TLV space ... note that it does not even list sub-TLVs which most if not each of the TLV defines. Do we really want to grow this single BGP Attribute even more ? Thx, R TLV Code Point Description IS-IS TLV/Sub-TLV Reference 0-255 Reserved [RFC7752 <http://www.iana.org/go/rfc7752>] 256 Local Node Descriptors [RFC7752, Section 3.2.1.2 <http://www.iana.org/go/rfc7752>] 257 Remote Node Descriptors [RFC7752, Section 3.2.1.3 <http://www.iana.org/go/rfc7752>] 258 Link Local/Remote Identifiers 22/4 [RFC5307, Section 1.1 <http://www.iana.org/go/rfc5307>] 259 IPv4 interface address 22/6 [RFC5305, Section 3.2 <http://www.iana.org/go/rfc5305>] 260 IPv4 neighbor address 22/8 [RFC5305, Section 3.3 <http://www.iana.org/go/rfc5305>] 261 IPv6 interface address 22/12 [RFC6119, Section 4.2 <http://www.iana.org/go/rfc6119>] 262 IPv6 neighbor address 22/13 [RFC6119, Section 4.3 <http://www.iana.org/go/rfc6119>] 263 Multi-Topology ID [RFC7752, Section 3.2.1.5 <http://www.iana.org/go/rfc7752>] 264 OSPF Route Type [RFC7752, Section 3.2.3 <http://www.iana.org/go/rfc7752> ] 265 IP Reachability Information [RFC7752, Section 3.2.3 <http://www.iana.org/go/rfc7752>] 266 Node MSD (TEMPORARY - registered 2017-11-02, extension registered 2018-09-07, expires 2019-11-02) 242/23 [ draft-ietf-idr-bgp-ls-segment-routing-msd <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-msd>] 267 Link MSD (TEMPORARY - registered 2017-11-02, extension registered 2018-09-07, expires 2019-11-02) (22,23,25,141,222,223)/15 [ draft-ietf-idr-bgp-ls-segment-routing-msd <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-msd>] 268-511 Unassigned 512 Autonomous System [RFC7752, Section 3.2.1.4 <http://www.iana.org/go/rfc7752>] 513 BGP-LS Identifier [RFC7752, Section 3.2.1.4 <http://www.iana.org/go/rfc7752>] 514 OSPF Area-ID [RFC7752, Section 3.2.1.4 <http://www.iana.org/go/rfc7752>] 515 IGP Router-ID [RFC7752, Section 3.2.1.4 <http://www.iana.org/go/rfc7752> ] 516 BGP Router-ID [draft-ietf-idr-bgpls-segment-routing-epe <http://www.iana.org/go/draft-ietf-idr-bgpls-segment-routing-epe>] 517 BGP Confederation Member [draft-ietf-idr-bgpls-segment-routing-epe <http://www.iana.org/go/draft-ietf-idr-bgpls-segment-routing-epe>] 518-1023 Unassigned 1024 Node Flag Bits [RFC7752, Section 3.3.1.1 <http://www.iana.org/go/rfc7752>] 1025 Opaque Node Attribute [RFC7752, Section 3.3.1.5 <http://www.iana.org/go/rfc7752>] 1026 Node Name variable [RFC7752, Section 3.3.1.3 <http://www.iana.org/go/rfc7752>] 1027 IS-IS Area Identifier variable [RFC7752, Section 3.3.1.2 <http://www.iana.org/go/rfc7752>] 1028 IPv4 Router-ID of Local Node 134/--- [RFC5305, Section 4.3 <http://www.iana.org/go/rfc5305>] 1029 IPv6 Router-ID of Local Node 140/--- [RFC6119, Section 4.1 <http://www.iana.org/go/rfc6119>] 1030 IPv4 Router-ID of Remote Node 134/--- [RFC5305, Section 4.3 <http://www.iana.org/go/rfc5305>] 1031 IPv6 Router-ID of Remote Node 140/--- [RFC6119, Section 4.1 <http://www.iana.org/go/rfc6119>] 1032-1033 Unassigned 1034 SR Capabilities [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1035 SR Algorithm [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1036 SR Local Block [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1037 SRMS Preference [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1038-1087 Unassigned 1088 Administrative group (color) 22/3 [RFC5305, Section 3.1 <http://www.iana.org/go/rfc5305>] 1089 Maximum link bandwidth 22/9 [RFC5305, Section 3.4 <http://www.iana.org/go/rfc5305>] 1090 Max. reservable link bandwidth 22/10 [RFC5305, Section 3.5 <http://www.iana.org/go/rfc5305>] 1091 Unreserved bandwidth 22/11 [RFC5305, Section 3.6 <http://www.iana.org/go/rfc5305>] 1092 TE Default Metric 22/18 [RFC7752, Section 3.3.2.3 <http://www.iana.org/go/rfc7752>] 1093 Link Protection Type 22/20 [RFC5307, Section 1.2 <http://www.iana.org/go/rfc5307>] 1094 MPLS Protocol Mask [RFC7752, Section 3.3.2.2 <http://www.iana.org/go/rfc7752>] 1095 IGP Metric [RFC7752, Section 3.3.2.4 <http://www.iana.org/go/rfc7752>] 1096 Shared Risk Link Group [RFC7752, Section 3.3.2.5 <http://www.iana.org/go/rfc7752>] 1097 Opaque Link Attribute [RFC7752, Section 3.3.2.6 <http://www.iana.org/go/rfc7752>] 1098 Link Name [RFC7752, Section 3.3.2.7 <http://www.iana.org/go/rfc7752>] 1099 Adjacency Segment Identifier (Adj-SID) TLV [ draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1100 LAN Adjacency Segment Identifier (Adj-SID) TLV [ draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1101 Peer-Node-SID [draft-ietf-idr-bgpls-segment-routing-epe <http://www.iana.org/go/draft-ietf-idr-bgpls-segment-routing-epe>] 1102 Peer-Adj-SID [draft-ietf-idr-bgpls-segment-routing-epe <http://www.iana.org/go/draft-ietf-idr-bgpls-segment-routing-epe>] 1103 Peer-Set-SID [draft-ietf-idr-bgpls-segment-routing-epe <http://www.iana.org/go/draft-ietf-idr-bgpls-segment-routing-epe>] 1104 Unassigned 1105 RTM Capability 22/40 [RFC8169 <http://www.iana.org/go/rfc8169>] 1106-1113 Unassigned 1114 Unidirectional Link Delay (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1115 Min/Max Unidirectional Link Delay (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1116 Unidirectional Delay Variation (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1117 Unidirectional Packet Loss (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1118 Unidirectional Residual Bandwidth (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1119 Unidirectional Available Bandwidth (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1120 Unidirectional Bandwidth Utilization (TEMPORARY - registered 2017-08-18, extension registered 2018-07-20, expires 2019-08-18) [ draft-ietf-idr-te-pm-bgp <http://www.iana.org/go/draft-ietf-idr-te-pm-bgp>] 1121 Graceful-Link-Shutdown TLV [RFC8379 <http://www.iana.org/go/rfc8379>] 1122-1151 Unassigned 1152 IGP Flags [RFC7752, Section 3.3.3.1 <http://www.iana.org/go/rfc7752>] 1153 IGP Route Tag [RFC5130 <http://www.iana.org/go/rfc5130>] 1154 IGP Extended Route Tag [RFC5130 <http://www.iana.org/go/rfc5130>] 1155 Prefix Metric [RFC5305 <http://www.iana.org/go/rfc5305>] 1156 OSPF Forwarding Address [RFC2328 <http://www.iana.org/go/rfc2328>] 1157 Opaque Prefix Attribute [RFC7752, Section 3.3.3.6 <http://www.iana.org/go/rfc7752>] 1158 Prefix SID [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1159 Range [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1160 Unassigned 1161 SID/Label TLV [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1162-1169 Unassigned 1170 IGP Prefix Attributes [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1171 Source Router-ID [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1172 L2 Bundle Member TLV [draft-ietf-idr-bgp-ls-segment-routing-ext <http://www.iana.org/go/draft-ietf-idr-bgp-ls-segment-routing-ext>] 1173 Extended Administrative Group (TEMPORARY - registered 2018-04-09, expires 2019-04-09) 22/14 [draft-ietf-idr-eag-distribution <http://www.iana.org/go/draft-ietf-idr-eag-distribution>][RFC7308 <http://www.iana.org/go/rfc7308>] 1174-65535 Unassigned
- [Idr] Growing BGP-LS Attribute Robert Raszuk
- Re: [Idr] Growing BGP-LS Attribute Adrian Farrel
- Re: [Idr] Growing BGP-LS Attribute Susan Hares
- Re: [Idr] Growing BGP-LS Attribute Robert Raszuk
- Re: [Idr] Growing BGP-LS Attribute Randy Bush
- Re: [Idr] Growing BGP-LS Attribute Robert Raszuk
- Re: [Idr] Growing BGP-LS Attribute Randy Bush
- Re: [Idr] Growing BGP-LS Attribute Ketan Talaulikar (ketant)
- Re: [Idr] Growing BGP-LS Attribute Adrian Farrel
- Re: [Idr] Growing BGP-LS Attribute Robert Raszuk
- Re: [Idr] Growing BGP-LS Attribute Ketan Talaulikar (ketant)
- Re: [Idr] Growing BGP-LS Attribute Robert Raszuk
- Re: [Idr] Growing BGP-LS Attribute Ketan Talaulikar (ketant)
- Re: [Idr] Growing BGP-LS Attribute Zhuangshunwan