[Lsr] Clarification on inconsistency between RFC7794 and draft-ietf-lsr-isis-srv6-extensions
"Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com> Wed, 24 February 2021 06:24 UTC
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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, "draft-ietf-lsr-isis-srv6-extensions@ietf.org" <draft-ietf-lsr-isis-srv6-extensions@ietf.org>
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Thread-Topic: Clarification on inconsistency between RFC7794 and draft-ietf-lsr-isis-srv6-extensions
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Date: Wed, 24 Feb 2021 06:24:47 +0000
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Subject: [Lsr] Clarification on inconsistency between RFC7794 and draft-ietf-lsr-isis-srv6-extensions
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Hi Peter, All, I'm am trying to clarify a potential inconsistency between RFC7794 and draft-ietf-lsr-isis-srv6-extensions. draft-ietf-lsr-isis-srv6-extensions says that we should advertise identical prefix-attribute tlv for the ipv6 reachability tlv and for the locator tlv. RFC7794 document says that we should not set the X flag in case of ipv6 routes because the ipv6 reachability tlv already has an external indication. Can you advise. 1. draft-ietf-lsr-isis-srv6-extensions The Prefix Attribute Flags Sub-TLV can be carried in the SRv6 Locator TLV as well as the Prefix Reachability TLVs. When a router originates both the Prefix Reachability TLV and the SRv6 Locator TLV for a given prefix, and the router is originating the Prefix Attribute Flags Sub-TLV in one of the TLVs, the router SHOULD advertise identical versions of the Prefix Attribute Flags Sub-TLV in both TLVs. 1. RFC7794 Prefix Attribute Flags Type: 4 Length: Number of octets of the Value field. Value: (Length * 8) bits. 0 1 2 3 4 5 6 7... +-+-+-+-+-+-+-+-+... |X|R|N| ... +-+-+-+-+-+-+-+-+... Bits are defined/sent starting with Bit 0 defined below. Additional bit definitions that may be defined in the future SHOULD be assigned in ascending bit order so as to minimize the number of bits that will need to be transmitted. Undefined bits MUST be transmitted as 0 and MUST be ignored on receipt. Bits that are NOT transmitted MUST be treated as if they are set to 0 on receipt. X-Flag: External Prefix Flag (Bit 0) Set if the prefix has been redistributed from another protocol. This includes the case where multiple virtual routers are supported and the source of the redistributed prefix is another IS-IS instance. The flag MUST be preserved when leaked between levels. In TLVs 236 and 237, this flag SHOULD always be sent as 0 and MUST be ignored on receipt. This is because there is an existing X flag defined in the fixed format of these TLVs as specified in [RFC5308<https://tools.ietf.org/html/rfc5308>] and [RFC5120<https://tools.ietf.org/html/rfc5120>]. G/
- [Lsr] Clarification on inconsistency between RFC7… Van De Velde, Gunter (Nokia - BE/Antwerp)
- Re: [Lsr] Clarification on inconsistency between … Peter Psenak
- Re: [Lsr] Clarification on inconsistency between … Van De Velde, Gunter (Nokia - BE/Antwerp)
- Re: [Lsr] Clarification on inconsistency between … Peter Psenak