Re: [Idr] Document shepherd review for draft-ietf-idr-rfc7752bis
"Ketan Talaulikar (ketant)" <ketant@cisco.com> Mon, 25 October 2021 11:56 UTC
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>, "draft-ietf-idr-rfc7752bis@ietf.org" <draft-ietf-idr-rfc7752bis@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: Document shepherd review for draft-ietf-idr-rfc7752bis
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Date: Mon, 25 Oct 2021 11:56:22 +0000
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Subject: Re: [Idr] Document shepherd review for draft-ietf-idr-rfc7752bis
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Hi Jeff, Given the cut-off date today, I've posted the update as per the proposals in this thread to give you and the WG an opportunity to review/comment. https://datatracker.ietf.org/doc/html/draft-ietf-idr-rfc7752bis-09 Will look forward to your inputs. Thanks, Ketan -----Original Message----- From: Ketan Talaulikar (ketant) Sent: 21 October 2021 22:18 To: Jeffrey Haas <jhaas@pfrc.org>; draft-ietf-idr-rfc7752bis@ietf.org; idr@ietf.org Subject: RE: Document shepherd review for draft-ietf-idr-rfc7752bis Hi Jeff, Thanks for your detailed review and apologies again for the delay in response. Please check inline below. -----Original Message----- From: Jeffrey Haas <jhaas@pfrc.org> Sent: 28 August 2021 01:31 To: draft-ietf-idr-rfc7752bis@ietf.org; idr@ietf.org Subject: Document shepherd review for draft-ietf-idr-rfc7752bis Ketan and Working Group, Here's my document shepherd review for RFC7752-bis. General assessment: Generally good shape, some concerns on error handling and consistency on NLRI keying. -- Jeff --- NLRI keying consistency: There are a number of TLVs that are optional. Some of these optional fields may be present in the NLRI. These include: - Autonomous System - BGP-LS Identifier (deprecated) - Multi-Topology ID Additional optional TLVs may be distributed in the protocol in the future. Consider two BGP-LS Producers. Producer 1 emits no optional fields for a given piece of link state. Producer 2 emits all of the optional fields. A BGP-LS Consumer may receive two distinct pieces of information for the same topology data. There is no discussion in the document as to how such inconsistencies could be handled by the Consumer. [KT] I agree with your point. How about we add the follow text towards the end of Sec 4.1 for both this one and the next comment? We want to cover this aspect but not really try to specify the behavior of a BGP-LS Consumer as that is outside the scope of this document. <NEW> When there are multiple BGP-LS Producers originating the same link-state information, implementation variations of BGP-LS Producers may result in the generation of different and inconsistent BGP-LS updates for the same link-state object based on the inclusion or exclusion of optional TLVs. An inconsistency between BGP-LS Producers with regards to the inclusion of optional TLVs in the NLRI results in multiple NLRIs being generated for the same link-state object. A BGP-LS Consumer would need the ability to merge such duplicate updates to handle such situations. An inconsistency between BGP-LS Producers with regards to the inclusion of optional TLVs in the BGP-LS Attribute results in one of them being delivered to a BGP-LS Consumer as part the BGP propagation and best-path selection procedures in most typical deployments. This can result in a BGP-LS Consumer missing out on some of the information in a potentially unpredictable manner. The use of BGP-LS Producers that have a consistent support for the origination of optional TLVs between them can help mitigate such situations for the BGP-LS Consumers. </NEW> --- BGP-LS Attribute consistency: Consider two BGP-LS Producers. Producer 1 emits no optional fields for a given piece of link state. Producer 2 emits all of the optional fields. (This is a simplified example. The critical detail is that the Path Attributes are not identical.) In any case where the BGP-LS NLRI is identical, an implementation will use BGP route selection procedures to pick one of the possible paths and select it to forward to its peers. In the absence of overriding policy features such as LOCAL_PREF or MED, this will often devolve to selecting the IGP distance to the BGP NEXT_HOP. (Choose closest point of Truth.) There's no discussion about how inconsistent information may be lost by having multiple producers that do not consistently produce their data. [KT] Please check if the proposed text for the previous comment addresses this one as well. --- The remainder of my comments have to do with Error Handling. My intent is not to re-litigate prior decisions, it's to note that the consequences of those prior decisions are not adequately discussed in the document. Section 7.2.2 does an admirable job in noting the usual things a BGP developer should look for in a specification. But mostly it says, no matter how bad the contents, move along: : Each TLV MAY indicate the valid and permissible values and their : semantics that can to be used only by a BGP-LS Consumer for its : semantic validation. However, the handling of any errors may be : specific to the particular application and outside the scope of this : document. A BGP-LS Consumer should ignore unrecognized and : unexpected TLV types in both the NLRI and BGP-LS Attribute portions : and not consider their presence as an error. While I must echo a common pithy comment from one of my protocol elders, "BGP is not a dump truck", in this case it is exactly that. The expectation is that if an implementation has a series of well-formed and nested TLVs that follow their ordering rules, that implementation is to pass things on. A significant portion of RFC 7606, BGP's Error Handling extensions, was intended to deal with what was called at the time "Optional-Transitive Nonsense". Much of the motivation for the RFC was preventing a downstream BGP peer from resetting its session because an ignorant upstream router was propagating bad data. Another portion of the motivation is that once you realize you have bad data, you shouldn't pass it along. The strict TLV structuring of BGP-LS makes the most types of syntactic errors impossible. However, BGP-LS describes a number of semantic validations using RFC 2119/8174 keywords without adequately describing what to do when those behaviors are violated at the BGP-LS Consumer. [KT] The specification of behavior and handling at a BGP-LS Consumer was considered to be out of scope of this draft. Simple examples of such things are: - TLVs of fixed length that are not of the proper length. [KT] This is covered in Section 7.2.2 for BGP-LS Speakers. It would be malformed and then handled differently based on whether that TLV is part of the NLRI or the BGP-LS Attribute. - TLVs that are mandatory that are absent. - TLVs that are not appropriate for a given NLRI type present in the attributes; e.g. Node properties for a Link NLRI. - Metrics that are of inappropriate size for their underlying protocol semantics. [KT] These all fall under the category of "semantic" verification and hence outside the scope of this draft - it is left to the specific BGP-LS Consumer application. While there may be an urge to not address such issues as "this is the Consumer's problem", this misses a common bit of learned BGP wisdom: Such things are the nightmare of interoperability. If you have two applications that are BGP-LS consumers that are intended to cooperate for implementing an application enabled by BGP-LS, and they have different error handling semantics, you may have incorrect operational behavior. [KT] You are obviously correct. Given the nature of the protocol, building a system using different implementations that are cooperating in a sort of distributed manner is fraught with challenges. Unless of course, there are specifications written for those systems (i.e. specific BGP-LS Consumer apps) on how they should handle such issues. Therefore out of scope of this document. Let me take an example, a semantic error in a BGP-LS consumer app that is just showing the network visualization may not care as much about a wrong IGP metric while a BGP-LS consumer app such as SR-PCE would have problems with it. While the visualization app may just use whatever is reported or not even care, the SR-PCE implementation might just not consider that link to be "valid" and consider it unavailable. That is why, IMO, it seems to be a correct decision to not get into the BGP-LS Consumer specification. That said, I fully agree with the challenges here. "Make the same mistakes everywhere" is not a great recipe. I strongly recommend that this issue be addressed either in section 7.2.2 or in a new section. [KT] Give, the previous comment, I am open to inputs on what can be incorporated into the document in this respect. --------------------------------------------------------------------------------- Some comments on the draft text are noted below. This is from the idnits output. 407 4.1. TLV Format [...] 435 type MUST be in ascending order based on the value field. Comparison 436 of the value fields is performed by treating the entire field as an 437 opaque hexadecimal string. Standard string comparison rules apply. I suspect what is intended here is opaque binary data rather than representing it in hexadecimal format. "Standard string comparison" might make sense if you were doing strcmp() on an actual hexadecimal string. The intent here is probably lexicographically ordered since "standard string comparison" isn't really defined here. [KT] Yes, I believe so. How about: <OLD> Comparison of the value fields is performed by treating the entire field as an opaque hexadecimal string. Standard string comparison rules apply. </OLD> <NEW> Comparison of the value fields is performed by treating the entire field as opaque binary data and ordered lexicographically. </NEW> 447 The TLVs within the BGP-LS Attribute MAY be ordered in ascending 448 order by TLV type. BGP-LS Attribute with unordered TLVs MUST NOT be 449 considered malformed. Probably "SHOULD be ordered"? If it's MAY be ordered and MUST NOT be malformed, why mention it at all? [KT] I am happy to drop both the sentences. The current text is more to clarify given the ambiguity in this regards in RFC7752. 451 4.2. The Link-State NLRI 453 The MP_REACH_NLRI and MP_UNREACH_NLRI attributes are BGP's containers 454 for carrying opaque information. This specification defines three 455 Link-State NLRI types that describe either a node, a link, and a 456 prefix. "either a node, a link, or a prefix" [KT] Ack [...] 495 0 1 2 3 496 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 497 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 498 | NLRI Type | Total NLRI Length | 499 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 500 | | 501 + Route Distinguisher + 502 | | 503 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 504 | | 505 // Link-State NLRI (variable) // 506 | | 507 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 509 Figure 6: Link-State VPN AFI 16388 / SAFI 72 NLRI Format I'd suggest mentioning the length of the route distinguisher in the diagram rather than letting it be solely inferred by the text representation. [KT] Ack 516 +------+---------------------------+ 517 | Type | NLRI Type | 518 +------+---------------------------+ 519 | 1 | Node NLRI | 520 | 2 | Link NLRI | 521 | 3 | IPv4 Topology Prefix NLRI | 522 | 4 | IPv6 Topology Prefix NLRI | 523 +------+---------------------------+ 525 Table 1: NLRI Types Note that the contents of this table do not match the IANA Considerations section. [KT] I think you are referring to 0 and the Private Use? Do they need to match since the IANA is more about allocation and this is about listing what is being introduced in the document. 529 The Node NLRI (NLRI Type = 1) is shown in the following figure. 531 0 1 2 3 532 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 533 +-+-+-+-+-+-+-+-+ 534 | Protocol-ID | 535 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 536 | Identifier | 537 | (64 bits) | 538 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 539 // Local Node Descriptors (variable) // 540 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 542 Figure 7: The Node NLRI Format The ASCII diagram covering Identifier isn't consistent with the multi-row format. Compare vs. Figure 6's Route Distinguisher. [KT] Fixed This issue occurs multiple places further in the document. [KT] Fixed The syntax of the Identifier isn't clearly discussed in the document. Is the intent to be a network-byte ordered uint64 number? [KT] Yes. Fixed as : s/ The 64-bit Identifier field carries a BGP-LS Instance Identifier (Instance-ID) / The Identifier field carries a 64-bit BGP-LS Instance Identifier (Instance-ID) number [...] 753 Autonomous System: Opaque value (32-bit AS Number). This is an 754 optional TLV. The value SHOULD be set to the AS Number associated 755 with the BGP process originating the link-state information. An 756 implementation MAY provide a configuration option on the BGP-LS 757 Producer to use a different value. Some text discussing private AS numbers would be helpful. The item of concern is when BGP-LS is used between cooperating ASes not under a single administrative control. In such cases, avoiding private AS collisions is an edge case. [KT] I am not sure if I've understood your point correctly, but how about add the following at the end of the current text. Please clarify or suggest text if you meant something different. E.g., to avoid collisions when using private AS numbers. [...] 795 There can be at most one instance of each sub-TLV type present in 796 any Node Descriptor. The sub-TLVs within a Node Descriptor MUST 797 be arranged in ascending order by sub-TLV type. This needs to be 798 done to compare NLRIs, even when an implementation encounters an 799 unknown sub-TLV. Using stable sorting, an implementation can do a 800 binary comparison of NLRIs and hence allow incremental deployment 801 of new key sub-TLVs. I believe this section is intended to be outdented one level? [KT] Yes. Fixed. [...] 895 The TLVs/sub-TLVs corresponding to the interface addresses and/or the 896 local/remote identifiers may not always be signaled in the IGPs 897 unless their advertisement is enabled specifically. In such cases, 898 it is valid to advertise a BGP-LS Link NLRI without any of these 899 identifiers. If there are multiple BGP-LS producers, can this happen if one producer is configured with this option and another is not? If so, the same Link Descriptor may be generated with different NLRI representation. [KT] The "advertisement is enabled" is referring to the IGP configuration. Once received, all BGP-LS producers will work the same with whatever they are able to get from the underlying IGPs. To provide more context, IGPs do not always advertise some of these identifiers unless features like TE or SR are enabled. 901 4.2.2.1. Multi-Topology ID 903 The Multi-Topology ID (MT-ID) TLV carries one or more IS-IS or OSPF 904 Multi-Topology IDs for a link, node, or prefix. 906 The semantics of the IS-IS MT-ID are defined in Section 7.1 and 7.2 907 of RFC 5120 [RFC5120]. The semantics of the OSPF MT-ID are defined 908 in Section 3.7 of RFC 4915 [RFC4915]. If the value in the MT-ID TLV 909 is derived from OSPF, then the upper 5 bits of the MT-ID field MUST 910 be set to 0. 912 The format of the MT-ID TLV is shown in the following figure. 914 0 1 2 3 915 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 916 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 917 | Type | Length=2*n | 918 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 919 |R R R R| Multi-Topology ID 1 | .... // 920 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 921 // .... |R R R R| Multi-Topology ID n | 922 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 924 Figure 12: Multi-Topology ID TLV Format 926 where Type is 263, Length is 2*n, and n is the number of MT-IDs 927 carried in the TLV. 929 The MT-ID TLV MAY be present in a Link Descriptor, a Prefix 930 Descriptor, or the BGP-LS attribute of a Node NLRI. In a Link or 931 Prefix Descriptor, only a single MT-ID TLV containing the MT-ID of 932 the topology where the link or the prefix is reachable is allowed. 933 In case one wants to advertise multiple topologies for a given Link 934 Descriptor or Prefix Descriptor, multiple NLRIs MUST be generated 935 where each NLRI contains a single unique MT-ID. When used in the 936 Link or Prefix Descriptor TLV for IS-IS, the Bits R are reserved and 937 MUST be set to 0 (as per Section 7.2 of RFC 5120 [RFC5120]) when 938 originated and ignored on receipt. 940 In the BGP-LS attribute of a Node NLRI, one MT-ID TLV containing the 941 array of MT-IDs of all topologies where the node is reachable is 942 allowed. When used in the Node Attribute TLV for IS-IS, the Bits R 943 are set as per Section 7.1 of RFC 5120 [RFC5120]. The text above for OSPF MT-ID values (RFC 4915, §3.7) could be somewhat clearer. The diagram above is structured for IS-IS. The OSPF intent is BOTH that R is set to zero (the IS-IS text has cases where it may be zero, or potentially non-zero) and also that the next 5 bits are also zero. Some clarity might be achieved by noting the MT-ID field for OSPF is 0..127. [KT] Ack. Fixed. 988 where the Type and Length fields of the TLV are defined in Table 5. 989 The OSPF Route Type field values are defined in the OSPF protocol and 990 can be one of the following: 992 o Intra-Area (0x1) 993 o Inter-Area (0x2) 995 o External 1 (0x3) 997 o External 2 (0x4) 999 o NSSA 1 (0x5) 1001 o NSSA 2 (0x6) The semantics of these are from OSPF, but what's the matching RFC section reference for the code points? [KT] These are actually BGP-LS code points. We don't anticipate new route types in OSPF (been so for decades) and that is why I skipped creating an IANA registry for them. But we can if that is the right thing to do. 1003 4.2.3.2. IP Reachability Information 1005 The IP Reachability Information TLV is a mandatory TLV for IPv4 & 1006 IPv6 Prefix NLRI types. The TLV contains one IP address prefix (IPv4 1007 or IPv6) originally advertised in the IGP topology. Its purpose is 1008 to glue a particular BGP service NLRI, using its BGP next-hop, to a 1009 given node in the LSDB. A router SHOULD advertise an IP Prefix NLRI "BGP service NLRI" isn't a well-defined thing. I suggest defining it. [KT] I will rather just delete that sentence since that is obviously not the main or even the sole purpose of the Prefix NLRI. 1013 0 1 2 3 1014 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1015 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1016 | Type | Length | 1017 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1018 | Prefix Length | IP Prefix (variable) // 1019 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1021 Figure 14: IP Reachability Information TLV Format 1023 The Type and Length fields of the TLV are defined in Table 5. The 1024 following two fields determine the reachability information of the 1025 address family. The Prefix Length field contains the length of the 1026 prefix in bits. The IP Prefix field contains the most significant 1027 octets of the prefix, i.e., 1 octet for prefix length 1 up to 8, 2 1028 octets for prefix length 9 to 16, 3 octets for prefix length 17 up to 1029 24, 4 octets for prefix length 25 up to 32, etc. We have a possible need for additional pedantry here regarding "trailing bits". RFC 4271, §4.3 defines the format for IPv4 NLRI. It says: : b) Prefix: : : The Prefix field contains an IP address prefix, followed by : the minimum number of trailing bits needed to make the end : of the field fall on an octet boundary. Note that the value : of trailing bits is irrelevant. A common fault in BGP implementations is failing to ignore the trailing bits for purposes of NLRI keying. This particular bug tends to be less of a problem for AFI/SAFIs where multiple NLRI may be packed in the same UPDATE message. Individual BGP Routes are unpacked as tuples of Path Attributes and their attached NLRI. In BGP-LS, the IP Reachability Information TLV is a component that is not surrounded solely by other prefixes, it's embedded. The procedures for BGP-LS push implementors toward simply doing binary comparison of various TLV contents. Even more so, as discussed under my notes on error handling, the implementor is pushed to ignore most semantic validation errors. The implication is that most developers are basically doing memcmp() for their comparison work. Since "trailing bits" are irrelevant, but matter for comparison purposes, I strongly suggest text be added that trailing bits are zeroed. [KT] Ack - agree. 1031 4.3. The BGP-LS Attribute 1033 The BGP-LS Attribute is an optional, non-transitive BGP attribute 1034 that is used to carry link, node, and prefix parameters and 1035 attributes. It is defined as a set of Type/Length/Value (TLV) It'd be useful to note that IANA has assigned code point 29 here. It is noted in the IANA Considerations. [KT] Ack 1044 The size of the BGP-LS Attribute may potentially grow large depending 1045 on the amount of link-state information associated with a single 1046 Link-State NLRI. The BGP specification [RFC4271] mandates a maximum 1047 BGP message size of 4096 octets. It is RECOMMENDED that an 1048 implementation support [RFC8654] to accommodate a larger size of 1049 information within the BGP-LS Attribute. BGP-LS Producers MUST 1050 ensure that they limit the TLVs included in the BGP-LS Attribute to 1051 ensure that a BGP update message for a single Link-State NLRI does 1052 not cross the maximum limit for a BGP message. The determination of 1053 the types of TLVs to be included MAY be made by the BGP-LS Producer 1054 based on the BGP-LS Consumer applications requirement and is outside 1055 the scope of this document. When a BGP-LS Propagator finds that it 1056 is exceeding the maximum BGP message size due to addition or update 1057 of some other BGP Attribute (e.g. AS_PATH), it MUST consider the 1058 BGP-LS Attribute to be malformed and handle the propagation as 1059 described in Section 7.2.2. While discussing RFC 8654 is appropriate, a related deployment consideration should be mentioned: If the BGP route propagation path is such that a large message (> 4096 octets) is created, it can only be sent along a contiguous path of BGP sessions that all support RFC 8654. Since loss of messages can result in incomplete link state information, this may result in a broken LSDB. [KT] Ack 1174 4.3.1.5. Opaque Node Attribute TLV 1176 The Opaque Node Attribute TLV is an envelope that transparently 1177 carries optional Node Attribute TLVs advertised by a router. An 1178 originating router shall use this TLV for encoding information 1179 specific to the protocol advertised in the NLRI header Protocol-ID 1180 field or new protocol extensions to the protocol as advertised in the 1181 NLRI header Protocol-ID field for which there is no protocol-neutral 1182 representation in the BGP Link-State NLRI. The primary use of the 1183 Opaque Node Attribute TLV is to bridge the document lag between, 1184 e.g., a new IGP link-state attribute being defined and the protocol- 1185 neutral BGP-LS extensions being published. This, and the related Opaque sections could use some discussion about what happens when that bridge has been crossed. Consider a feature that can move from a new link-state attribute carried in the Opaque information and has a code point later added to carry in BGP-LS: There's possibly an incremental deployment motivation to carry the information in both spots. This means keeping the values consistent in each place becomes important. [KT] Ack. How about adding the following? <NEW> Once the protocol-neutral BGP-LS extensions are defined, the BGP-LS implementations would still need to advertise the information both within the Opaque Attribute TLV and the new TLV definition for incremental deployment and transition. </NEW> 1273 0 1 2 3 1274 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1275 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1276 | Type | Length | 1277 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1278 |L|R| Reserved | 1279 +-+-+-+-+-+-+-+-+ 1281 Figure 19: MPLS Protocol Mask TLV Here, and later in the document, "Reserved" likely should be "MUST be set to zero and SHOULD be ignored on receipt". [KT] Ack 1451 0 1 2 3 1452 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 1453 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1454 | Type | Length | 1455 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1456 |D|N|L|P| | 1457 +-+-+-+-+-+-+-+-+ 1459 Figure 25: IGP Flag TLV Format Suggest marking the empty space as Reserved. See prior comment about Reserved. [KT] Ack 2032 6.1.4. BGP-LS Node Flags Registry 2034 The "BGP-LS Node Flags" registry is requested to be created for the 2035 one-octet sized flags field of the Node Flag Bits TLV (1024) and 2036 populated with the initial values shown below: 2038 Bit Description Reference 2039 ----------------------------------------------- 2040 0 Overload Bit (O-bit) [This document] 2041 1 Attached Bit (A-bit) [This document] 2042 2 External Bit (E-bit) [This document] 2043 3 ABR Bit (B-bit) [This document] 2044 4 Router Bit (R-bit) [This document] 2045 5 V6 Bit (V-bit) [This document] 2046 6-7 Unassigned 2048 Allocations within the registry under the "RFC Required" policy (see 2049 [RFC8126]). This registry is absent from the IANA Considerations. Similarly, IANA does not have a registry in the expected place: https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml [KT] Yes, this was missed by RFC7752 and we are fixing this now by creating it. 2051 6.1.5. BGP-LS MPLS Protocol Mask Registry 2053 The "BGP-LS MPLS Protocol Mask" registry is requested to be created 2054 for the one-octet sized flags field of the MPLS Protocol Mask TLV 2055 (1094) and populated with the initial values shown below: 2057 Bit Description Reference 2058 ------------------------------------------------------------------ 2059 0 Label Distribution Protocol (L-bit) [This document] 2060 1 Extension to RSVP for LSP Tunnels (R-bit) [This document] 2061 2-7 Unassigned 2063 Allocations within the registry under the "RFC Required" policy (see 2064 [RFC8126]). See prior comment about missing IANA Considerations and registry at IANA. [KT] Same as previous. 2066 6.1.6. BGP-LS IGP Prefix Flags Registry 2068 The "BGP-LS IGP Prefix Flags" registry is requested to be created for 2069 the 1 octet sized flags field of the IGP Flags TLV (1152) and 2070 populated with the initial values shown below: 2072 Bit Description Reference 2073 ---------------------------------------------------------- 2074 0 IS-IS Up/Down Bit (D-bit) [This document] 2075 1 OSPF "no unicast" Bit (N-bit) [This document] 2076 2 OSPF "local address" Bit (L-bit) [This document] 2077 3 OSPF "propagate NSSA" Bit (P-bit) [This document] 2078 4-7 Unassigned 2080 Allocations within the registry under the "RFC Required" policy (see 2081 [RFC8126]). See prior comment about missing IANA Considerations and registry at IANA. [KT] Same as previous. Thanks, Ketan
- [Idr] Document shepherd review for draft-ietf-idr… Jeffrey Haas
- Re: [Idr] Document shepherd review for draft-ietf… Jeffrey Haas
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)
- Re: [Idr] Document shepherd review for draft-ietf… Jeffrey Haas
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)
- Re: [Idr] Document shepherd review for draft-ietf… Jeffrey Haas
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)
- Re: [Idr] Document shepherd review for draft-ietf… Jeffrey Haas
- Re: [Idr] Document shepherd review for draft-ietf… Ketan Talaulikar (ketant)