6man R. Bonica Internet-Draft Juniper Networks Intended status: Standards Track Y. Kamite Expires: January 6, 2020 NTT Communications Corporation T. Niwa KDDI A. Alston D. Henriques Liquid Telecom N. So F. Xu Reliance Jio G. Chen Baidu Y. Zhu G. Yang China Telecom Y. Zhou ByteDance July 5, 2019 The IPv6 Compressed Routing Header (CRH) draft-bonica-6man-comp-rtg-hdr-05 Abstract This document defines a new IPv6 Routing header type, called the Compressed Routing Header (CRH). SRv6+ nodes use the CRH to steer packets from segment to segment along SRv6+ paths. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 6, 2020. Bonica, et al. Expires January 6, 2020 [Page 1] Internet-Draft IPv6 Compressed Routing Header July 2019 Copyright Notice Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3 3. The Compressed Routing Header (CRH) . . . . . . . . . . . . . 3 4. Segment Forwarding Information Base (SFIB) . . . . . . . . . 5 5. Processing Rules . . . . . . . . . . . . . . . . . . . . . . 5 5.1. General . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.2. CRH Specific . . . . . . . . . . . . . . . . . . . . . . 6 5.2.1. Computing Minimum CRH Length . . . . . . . . . . . . 7 5.2.2. Strictly-Routed Topological Instructions . . . . . . 8 5.2.3. Loosely-Routed Topological Instructions . . . . . . . 9 6. Mutability . . . . . . . . . . . . . . . . . . . . . . . . . 9 7. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . 9 8. Management Considerations . . . . . . . . . . . . . . . . . . 9 9. Security Considerations . . . . . . . . . . . . . . . . . . . 10 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 10 12.1. Normative References . . . . . . . . . . . . . . . . . . 10 12.2. Informative References . . . . . . . . . . . . . . . . . 11 Appendix A. CRH Processing Examples . . . . . . . . . . . . . . 11 A.1. Loose Source Routing . . . . . . . . . . . . . . . . . . 13 A.2. Loose Source Routing Preserving The First SID . . . . . . 13 A.3. Strict Source Routing . . . . . . . . . . . . . . . . . . 14 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15 1. Introduction This document defines a new IPv6 [RFC8200] Routing header type, called the Compressed Routing Header (CRH). SRv6+ [I-D.bonica-spring-srv6-plus] nodes use the CRH to steer packets from segment to segment along SRv6+ paths. Bonica, et al. Expires January 6, 2020 [Page 2] Internet-Draft IPv6 Compressed Routing Header July 2019 For details regarding SRv6+ paths, segments, Segment Identifiers (SIDs) and instructions, see [I-D.bonica-spring-srv6-plus]. 2. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 3. The Compressed Routing Header (CRH) 0 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Header | Hdr Ext Len | Routing Type | Segments Left | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Last Entry |Com| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SID List ........ +-+-+-+-+-+-+-+-+-+-+- Figure 1: Compressed Routing Header (CRH) Figure 1 depicts the CRH. The CRH contains the following fields: o Next Header - Defined in [RFC8200]. o Hdr Ext Len - Defined in [RFC8200]. o Routing Type - Defined in [RFC8200]. Value TBD by IANA. (Suggested value: 5) o Segments Left - Defined in [RFC8200]. o Last Entry - 8 bits. Represents the zero-based index of the last element of the Segment List. o Com (Compression) - 2 bits. Represents the length of each entry in the SID List. Values are reserved (0), sixteen bits (1), thirty-two bits (2), and reserved (3). In order to maximize header compression, this value should reflect the smallest feasible Maximum SID Value (MSV). See Section 5.1 of [I-D.bonica-spring-srv6-plus] for MSV details. Bonica, et al. Expires January 6, 2020 [Page 3] Internet-Draft IPv6 Compressed Routing Header July 2019 o Reserved - SHOULD be set to zero by the sender. MUST be ignored by the receiver. o SID List - Represents the SRv6+ path as an ordered list of SIDs. SIDs are listed in reverse order, with SID[0] representing the final segment, SID[1] representing the penultimate segment, and so forth. SIDs are listed in reverse order so that Segments Left can be used as an index to the SID List. The SID indexed by Segments Left is called the current SID. Figure 2 and Figure 3 illustrate CRH encodings with Com equal to 1 and 2. In all cases, the CRH MUST end on a 64-bit boundary. Therefore, the CRH MAY be padded with zeros. 0 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Header | Hdr Ext Len | Routing Type | Segments Left | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Last Entry |Com| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | SID[0] | SID[1] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-| | ......... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- Figure 2: Sixteen-bit Encoding (Com equals 1) 0 1 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Header | Hdr Ext Len | Routing Type | Segments Left | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Last Entry |Com| Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + SID[0] + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + SID[1] + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ // // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + SID[n] + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 3: Thirty-two bit Encoding (Com equals 2) Bonica, et al. Expires January 6, 2020 [Page 4] Internet-Draft IPv6 Compressed Routing Header July 2019 4. Segment Forwarding Information Base (SFIB) A segment ingress node MUST maintain one Segment Forwarding Information Base (SFIB) entry for each segment that it originates. Each SFIB entry contains the following information: o A SID o A segment type o Topological instruction parameters The following are valid segment types: o Strictly-routed o Loosely-routed The following parameters are associated with topological instructions that control strictly-routed segments: o An IPv6 address that identifies an interface on the segment egress node. o A primary interface identifier. o Zero or more secondary interface identifiers. Loosely-routed segments are associated with a single topological instruction parameter. This parameter is an IPv6 address that identifies an interface on the segment egress node. 5. Processing Rules 5.1. General [RFC8200] defines rules that apply to IPv6 extension headers, in general, and IPv6 Routing headers, in particular. All of these rules apply to the CRH. For example: o Extension headers (except for the Hop-by-Hop Options header) are not processed, inserted, or deleted by any node along a packet's delivery path, until the packet reaches the node (or each of the set of nodes, in the case of multicast) identified in the Destination Address field of the IPv6 header. Bonica, et al. Expires January 6, 2020 [Page 5] Internet-Draft IPv6 Compressed Routing Header July 2019 o If, while processing a received packet, a node encounters a Routing header with an unrecognized Routing Type value, the required behavior of the node depends on the value of the Segments Left field. If Segments Left is zero, the node must ignore the Routing header and proceed to process the next header in the packet, whose type is identified by the Next Header field in the Routing header. If Segments Left is non-zero, the node must discard the packet and send an ICMPv6 [RFC4443] Parameter Problem, Code 0, message to the packet's Source Address, pointing to the unrecognized Routing Type. o If, after processing a Routing header of a received packet, an intermediate node determines that the packet is to be forwarded onto a link whose link MTU is less than the size of the packet, the node must discard the packet and send an ICMPv6 Packet Too Big message to the packet's Source Address. 5.2. CRH Specific When a node recognizes and processes a CRH, it executes the following procedure: o If the IPv6 Source Address is a link-local address, discard the packet. o If the IPv6 Source Address is a multicast address, discard the packet. o If Segments Left equal 0, skip over the CRH and process the next header in the packet. o If Segments Left is greater than Last Entry plus one, discard the packet and send an ICMPv6 Parameter Problem, Code 0, message to the Source Address, pointing to the Segments Left field. o If Com is equal to (0) or (3) Reserved, discard the packet and send an ICMPv6 Parameter Problem, Code 0, message to the Source Address, pointing to the Com field. o Compute L, the minimum CRH length (See Section 5.2.1) o If L is equal to zero or L is greater than Hdr Ext Len, discard the packet and send an ICMPv6 Parameter Problem, Code 0, message to the Source Address, pointing to the Last Entry field. o Decrement the packet's Hop Count. Bonica, et al. Expires January 6, 2020 [Page 6] Internet-Draft IPv6 Compressed Routing Header July 2019 o If the Hop Count has expired, discard the packet and send an ICMPv6 Time Expired message to the packet's source node. o Decrement Segments Left o Search for the current SID in the SFIB. o If the above-mentioned search does not return an SFIB entry, discard the packet and send an ICMPv6 Parameter Problem, Code 0, message to the Source Address, pointing to the current SID. o If the above-mentioned search returns an SFIB entry and the segment type is strictly-routed, execute the strictly-routed topological instruction described in Section 5.2.2. o If the above-mentioned search returns an SFIB entry and the segment type is loosely-routed, execute the loosely-routed topological instruction described in Section 5.2.3. The above stated rules are demonstrated in Appendix A. 5.2.1. Computing Minimum CRH Length The algorithm described in this section accepts the following CRH fields as its input parameters: o Compression (Com). o Last Entry. It yields L, the minimum CRH length. The minimum CRH length is measured in 8-octet units, not including the first 8 octets. Bonica, et al. Expires January 6, 2020 [Page 7] Internet-Draft IPv6 Compressed Routing Header July 2019 if (Com == 1 ) { /* Sixteen bit encoding */ L = ( ( Last Entry + 1 ) / 4 ); if ( ( Last Entry + 1 ) % 4 ) L++; } elsif (Com == 2 ) { /* Thirty-two bit encoding */ L = ( ( Last Entry + 1 ) / 2 ); if ( ( Last Entry + 1 ) % 2 ) L++; } else { /* Invalid Com */ L = 0xFF } return(0) 5.2.2. Strictly-Routed Topological Instructions A strictly-routed topological instruction accepts the following parameters:: o An IPv6 address that identifies an interface on the segment egress node. o A primary interface identifier. o Zero or more secondary interface identifiers. A strictly-routed topological instruction behaves as follows: o If none of the interfaces identified by the above-mentioned parameters are operational, discard the packet and send an ICMPv6 Destination Unreachable message (Code: 5, Source Route Failed) to the packet's source node. o Overwrite the packet's Destination Address with the IPv6 address that was received as a parameter. o If the primary interface is active, forward the packet through the primary interface. Bonica, et al. Expires January 6, 2020 [Page 8] Internet-Draft IPv6 Compressed Routing Header July 2019 o If the primary interface is not active and any of the secondary interfaces are active, forward the packet through one of the secondary interfaces. Execute procedures so that all packets belonging to a flow are forwarded through the same secondary interface. 5.2.3. Loosely-Routed Topological Instructions A loosely-routed topological instruction accepts a single parameter. This parameter is an IPv6 address that identifies an interface on the segment egress node. A loosely-routed topological instruction behaves as follows: o If the segment ingress node does not have a viable route to the IPv6 address included as a parameter, discard the packet and send an ICMPv6 Destination Unreachable message (Code:1 Net Unreachable) to the packet's source node. o Overwrite the packet's Destination Address with the destination address that was included as a parameter. o Forward the packet to the next hop along the least cost path to the segment egress node. If there are multiple least cost paths to the segment egress node (i.e., Equal Cost Multipath), execute procedures so that all packets belonging to a flow are forwarded through the same next hop. 6. Mutability In the CRH, the Segments Left field is mutable. All remaining fields are immutable. 7. Compliance In order to be compliant with this specification, an implementation MUST support 32-bit SID encoding. It MAY also support 16-bit SID encoding. 8. Management Considerations PING and TRACEROUTE [RFC2151] both operate correctly in the presence of the CRH. Bonica, et al. Expires January 6, 2020 [Page 9] Internet-Draft IPv6 Compressed Routing Header July 2019 9. Security Considerations The CRH can be used within trusted domains only. In order to enforce this requirement, domain edge routers MUST do one of the following: o Discard all inbound packets that are destined for infrastructure interfaces and contain a CRH o Authenticate [RFC4302] [RFC4303] all inbound packets that are destined for infrastructure interfaces and contain a CRH 10. IANA Considerations This document makes the following registration in the Internet Protocol Version 6 (IPv6) Parameters "Routing Type" registry maintained by IANA: Suggested Value Description Reference ------------------------------------------------------------ 5 Compressed Routing Header (CRH) This document 11. Acknowledgements Thanks to Joel Halpern, Tony Li, Gerald Schmidt, Nancy Shaw and Chandra Venkatraman for their comments. 12. References 12.1. Normative References [I-D.bonica-spring-srv6-plus] Bonica, R., Hegde, S., Kamite, Y., Alston, A., Henriques, D., Halpern, J., and J. Linkova, "IPv6 Support for Segment Routing: SRv6+", draft-bonica-spring-srv6-plus-01 (work in progress), July 2019. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4302] Kent, S., "IP Authentication Header", RFC 4302, DOI 10.17487/RFC4302, December 2005, . Bonica, et al. Expires January 6, 2020 [Page 10] Internet-Draft IPv6 Compressed Routing Header July 2019 [RFC4303] Kent, S., "IP Encapsulating Security Payload (ESP)", RFC 4303, DOI 10.17487/RFC4303, December 2005, . [RFC4443] Conta, A., Deering, S., and M. Gupta, Ed., "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification", STD 89, RFC 4443, DOI 10.17487/RFC4443, March 2006, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", STD 86, RFC 8200, DOI 10.17487/RFC8200, July 2017, . 12.2. Informative References [RFC2151] Kessler, G. and S. Shepard, "A Primer On Internet and TCP/ IP Tools and Utilities", FYI 30, RFC 2151, DOI 10.17487/RFC2151, June 1997, . Appendix A. CRH Processing Examples This appendix provides examples of CRH processing in the following applications: o Loose source routing (Appendix A.1) o Loose source routing preserving the first SID (Appendix A.2) o Strict source routing (Appendix A.3) Bonica, et al. Expires January 6, 2020 [Page 11] Internet-Draft IPv6 Compressed Routing Header July 2019 ----------- 2001:db8:0:2/64 |Node: I2 | 2001:db8:0:4/64 ----------------------|Loopback: |-------------------- | ::2 |2001:db8::2| ::1 | | ----------- | | ::1 :: 2| ----------- ----------- ----------- |Node: S |2001:db8:0:1/64|Node: I1 |2001:db8:0:3/64|Node: I3 | |Loopback |---------------|Loopback: |---------------|Loopback: | |2001:db8::a| ::1 ::2 |2001:db8::1| ::1 ::2 |2001:db8::3| ----------- ----------- ----------- | ::1 ----------- | |Node: D | 2001:db8:0:b/64 | |Loopback: |--------------------- |2001:db8::b| ::2 ----------- Figure 4: Reference Topology Figure 4 provides a reference topology that is used in all examples. +--------------------+-----+----------------+--------------+ | Instantiating Node | SID | Segment Type | IPv6 Address | +--------------------+-----+----------------+--------------+ | All | 1 | Loosely-routed | 2001:db8::1 | | All | 2 | Loosely-routed | 2001:db8::2 | | All | 3 | Loosely-routed | 2001:db8::3 | | All | 10 | Loosely-routed | 2001:db8::a | | All | 11 | Loosely-routed | 2001:db8::b | +--------------------+-----+----------------+--------------+ Table 1: Loosely Routed SIDs Table 1 describes SFIB entries that are instantiated on all nodes. All of these SFIB entries represent loosely-routed segments. Bonica, et al. Expires January 6, 2020 [Page 12] Internet-Draft IPv6 Compressed Routing Header July 2019 +---------------+-----+-----------------+------------+--------------+ | Instantiating | SID | IPv6 Address | Primary | Secondary | | Node | | | Interface | Interfaces | +---------------+-----+-----------------+------------+--------------+ | S | 129 | 2001:db8:0:1::2 | S -> I1 | none | | S | 130 | 2001:db8:0:2::2 | S -> I2 | none | | I1 | 129 | 2001:db8:0:3::2 | I1 -> I3 | none | | I2 | 129 | 2001:db8:0:4::2 | I2 -> I3 | none | | I3 | 129 | 2001:db8:0:b::2 | I3 -> D | none | +---------------+-----+-----------------+------------+--------------+ Table 2: Strictly Routed SIDs Table 2 describes SFIB entries that are instantiated on specific nodes. All of these SFIB entries represent strictly-routed segments. A.1. Loose Source Routing In this example, Node S sends a packet to Node D, specifying loose source route through Node I3. In this example, the first node in the path, I3, does not appear in the CRH segment list. Therefore, the destination node may not be able to send return traffic through the same path. +-------------------------------------+-------------------+ | As the packet travels from S to I3: | | +-------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 0 | | Destination Address = 2001:db8::3 | Segments Left = 1 | | | SID[0] = 11 | +-------------------------------------+-------------------+ +-------------------------------------+-------------------+ | As the packet travels from I3 to D: | | +-------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 0 | | Destination Address = 2001:db8::b | Segments Left = 0 | | | SID[0] = 11 | +-------------------------------------+-------------------+ A.2. Loose Source Routing Preserving The First SID In this example, Node S sends a packet to Node D, specifying loose source route through Node I3. In this example, the first node in the path, I3, appears in the CRH segment list. Therefore, the destination node can send return traffic through the same path. Bonica, et al. Expires January 6, 2020 [Page 13] Internet-Draft IPv6 Compressed Routing Header July 2019 +-------------------------------------+-------------------+ | As the packet travels from S to I3: | | +-------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 1 | | Destination Address = 2001:db8::3 | Segments Left = 1 | | | SID[0] = 11 | | | SID[1] = 3 | +-------------------------------------+-------------------+ +-------------------------------------+-------------------+ | As the packet travels from I3 to D: | | +-------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 1 | | Destination Address = 2001:db8::b | Segments Left = 0 | | | SID[0] = 11 | | | SID[1] = 3 | +-------------------------------------+-------------------+ A.3. Strict Source Routing In this example, Node S sends a packet to Node D, specifying the strict source route through I1 and I3. +---------------------------------------+-------------------+ | As the packet travels from S to I1: | | +---------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 1 | | Destination Address = 2001:db8:0:1::2 | Segments Left = 2 | | | SID[0] = 129 | | | SID[1] = 129 | +---------------------------------------+-------------------+ +---------------------------------------+-------------------+ | As the packet travels from I1 to I3: | | +---------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 1 | | Destination Address = 2001:db8:0:3::2 | Segments Left = 1 | | | SID[0] = 129 | | | SID[1] = 129 | +---------------------------------------+-------------------+ Bonica, et al. Expires January 6, 2020 [Page 14] Internet-Draft IPv6 Compressed Routing Header July 2019 +---------------------------------------+-------------------+ | As the packet travels from I3 to D: | | +---------------------------------------+-------------------+ | Source Address = 2001:db8::a | Last Entry = 1 | | Destination Address = 2001:db8:0:b::2 | Segments Left = 0 | | | SID[0] = 129 | | | SID[1] = 129 | +---------------------------------------+-------------------+ Authors' Addresses Ron Bonica Juniper Networks 2251 Corporate Park Drive Herndon, Virginia 20171 USA Email: rbonica@juniper.net Yuji Kamite NTT Communications Corporation 3-4-1 Shibaura, Minato-ku Tokyo 108-8118 Japan Email: : y.kamite@ntt.com Tomonobu Niwa KDDI 3-22-7, Yoyogi, Shibuya-ku Tokyo 151-0053 Japan Email: to-niwa@kddi.com Andrew Alston Liquid Telecom Nairobi Kenya Email: Andrew.Alston@liquidtelecom.com Bonica, et al. Expires January 6, 2020 [Page 15] Internet-Draft IPv6 Compressed Routing Header July 2019 Daniam Henriques Liquid Telecom Johannesburg South Africa Email: daniam.henriques@liquidtelecom.com Ning So Reliance Jio 3010 Gaylord PKWY, Suite 150 Frisco, Texas 75034 USA Email: Ning.So@ril.com Fengman Xu Reliance Jio 3010 Gaylord PKWY, Suite 150 Frisco, Texas 75034 USA Email: Fengman.Xu@ril.com Gang Chen Baidu No.10 Xibeiwang East Road Haidian District Beijing 100193 P.R. China Email: phdgang@gmail.com Yongqing Zhu China Telecom 109 West Zhongshan Ave, Tianhe District Guangzhou P.R. China Email: zhuyq.gd@chinatelecom.cn Bonica, et al. Expires January 6, 2020 [Page 16] Internet-Draft IPv6 Compressed Routing Header July 2019 Guangming Yang China Telecom 109 West Zhongshan Ave, Tianhe District Guangzhou P.R. China Email: yanggm.gd@chinatelecom.cn Yifeng Zhou ByteDance Building 1, AVIC Plaza, 43 N 3rd Ring W Rd Haidian District Beijing 100000 P.R. China Email: yifeng.zhou@bytedance.com Bonica, et al. Expires January 6, 2020 [Page 17]