Internet Engineering Task Force (IETF) H. Song
Request for Comments: 9630 M. McBride
Category: Standards Track Futurewei Technologies
ISSN: 2070-1721 G. Mirsky
Ericsson
G. Mishra
Verizon Inc.
H. Asaeda
NICT
T. Zhou
Huawei Technologies
August 2024
Multicast On-Path Telemetry Using In Situ Operations, Administration,
and Maintenance (IOAM)
Abstract
This document specifies two solutions to meet the requirements of on-
path telemetry for multicast traffic using IOAM. While IOAM is
advantageous for multicast traffic telemetry, some unique challenges
are present. This document provides the solutions based on the IOAM
trace option and direct export option to support the telemetry data
correlation and the multicast tree reconstruction without incurring
data redundancy.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc9630.
Copyright Notice
Copyright (c) 2024 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
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Table of Contents
1. Introduction
1.1. Requirements Language
2. Requirements for Multicast Traffic Telemetry
3. Issues of Existing Techniques
4. Modifications and Extensions Based on Existing Solutions
4.1. Per-Hop Postcard Using IOAM DEX
4.2. Per-Section Postcard for IOAM Trace
5. Application Considerations for Multicast Protocols
5.1. Mtrace Version 2
5.2. Application in PIM
5.3. Application of MVPN PMSI Tunnel Attribute
6. Security Considerations
7. IANA Considerations
8. References
8.1. Normative References
8.2. Informative References
Acknowledgments
Authors' Addresses
1. Introduction
IP multicast has had many useful applications for several decades.
[MULTICAST-LESSONS-LEARNED] provides a thorough historical
perspective about the design and deployment of many of the multicast
routing protocols in use with various applications. We will mention
of few of these throughout this document and in the Application
Considerations section (Section 5). IP multicast has been used by
residential broadband customers across operator networks, private
MPLS customers, and internal customers within corporate intranets.
IP multicast has provided real-time interactive online meetings or
podcasts, IPTV, and financial markets' real-time data, all of which
rely on UDP's unreliable transport. End-to-end QoS, therefore,
should be a critical component of multicast deployments in order to
provide a good end-user experience within a specific operational
domain. In multicast real-time media streaming, if a single packet
is lost within a keyframe and cannot be recovered using forward error
correction, many receivers will be unable to decode subsequent frames
within the Group of Pictures (GoP), which results in video freezes or
black pictures until another keyframe is delivered. Unexpectedly
long delays in delivery of packets can cause timeouts with similar
results. Multicast packet loss and delays can therefore affect
application performance and the user experience within a domain.
It is essential to monitor the performance of multicast traffic. New
on-path telemetry techniques, such as IOAM [RFC9197], IOAM Direct
Export (DEX) [RFC9326], IOAM Postcard-Based Telemetry - Marking (PBT-
M) [POSTCARD-TELEMETRY], and Hybrid Two-Step (HTS) [HYBRID-TWO-STEP],
complement existing active OAM performance monitoring methods like
ICMP ping [RFC0792]. However, multicast traffic's unique
characteristics present challenges in applying these techniques
efficiently.
The IP multicast packet data for a particular (S,G) state remains
identical across different branches to multiple receivers [RFC7761].
When IOAM trace data is added to multicast packets, each replicated
packet retains telemetry data for its entire forwarding path. This
results in redundant data collection for common path segments,
unnecessarily consuming extra network bandwidth. For large multicast
trees, this redundancy is substantial. Using solutions like IOAM DEX
could be more efficient by eliminating data redundancy, but IOAM DEX
lacks a branch identifier, complicating telemetry data correlation
and multicast tree reconstruction.
This document provides two solutions to the IOAM data-redundancy
problem based on the IOAM standards. The requirements for multicast
traffic telemetry are discussed along with the issues of the existing
on-path telemetry techniques. We propose modifications and
extensions to make these techniques adapt to multicast in order for
the original multicast tree to be correctly reconstructed while
eliminating redundant data. This document does not cover the
operational considerations such as how to enable the telemetry on a
subset of the traffic to avoid overloading the network or the data
collector.
1.1. 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.
2. Requirements for Multicast Traffic Telemetry
Multicast traffic is forwarded through a multicast tree. With PIM
[RFC7761] and Point-to-Multipoint (P2MP), the forwarding tree is
established and maintained by the multicast routing protocol.
The requirements for multicast traffic telemetry that are addressed
by the solutions in this document are:
* Reconstruct and visualize the multicast tree through data-plane
monitoring.
* Gather the multicast packet delay and jitter performance on each
path.
* Find the multicast packet-drop location and reason.
In order to meet all of these requirements, we need the ability to
directly monitor the multicast traffic and derive data from the
multicast packets. The conventional OAM mechanisms, such as
multicast ping [RFC6450], trace [RFC8487], and RTCP [RFC3605], are
not sufficient to meet all of these requirements. The telemetry
methods in this document meet these requirements by providing
granular hop-by-hop network monitoring along with the reduction of
data redundancy.
3. Issues of Existing Techniques
On-path telemetry techniques that directly retrieve data from
multicast traffic's live network experience are ideal for addressing
the aforementioned requirements. The representative techniques
include IOAM Trace option [RFC9197], IOAM DEX option [RFC9326], and
PBT-M [POSTCARD-TELEMETRY]. However, unlike unicast, multicast poses
some unique challenges to applying these techniques.
Multicast packets are replicated at each branch fork node in the
corresponding multicast tree. Therefore, there are multiple copies
of the original multicast packet in the network.
When the IOAM trace option is utilized for on-path data collection,
partial trace data is replicated into the packet copy for each branch
of the multicast tree. Consequently, at the leaves of the multicast
tree, each copy of the multicast packet contains a complete trace.
This results in data redundancy, as most of the data (except from the
final leaf branch) appears in multiple copies, where only one is
sufficient. This redundancy introduces unnecessary header overhead,
wastes network bandwidth, and complicates data processing. The
larger the multicast tree or the longer the multicast path, the more
severe the redundancy problem becomes.
The postcard-based solutions (e.g., IOAM DEX) can eliminate data
redundancy because each node on the multicast tree sends a postcard
with only local data. However, these methods cannot accurately track
and correlate the tree branches due to the absence of branching
information. For instance, in the multicast tree shown in Figure 1,
Node B has two branches, one to Node C and the other to node D;
further, Node C leads to Node E, and Node D leads to Node F (not
shown). When applying postcard-based methods, it is impossible to
determine whether Node E is the next hop of Node C or Node D from the
received postcards alone, unless one correlates the exporting nodes
with knowledge about the tree collected by other means (e.g.,
mtrace). Such correlation is undesirable because it introduces extra
work and complexity.
The fundamental reason for this problem is that there is not an
identifier (either implicit or explicit) to correlate the data on
each branch.
4. Modifications and Extensions Based on Existing Solutions
We provide two solutions to address the above issues. One is based
on IOAM DEX and requires an extension to the DEX Option-Type header.
The second solution combines the IOAM trace option and postcards for
redundancy removal.
4.1. Per-Hop Postcard Using IOAM DEX
One way to mitigate the postcard-based telemetry's tree-tracking
weakness is to augment it with a branch identifier field. This works
for the IOAM DEX option because the DEX Option-Type header can be
used to hold the branch identifier. To make the branch identifier
globally unique, the Branching Node ID plus an index is used. For
example, as shown in Figure 1, Node B has two branches: one to Node C
and the other to Node D. Node B may use [B, 0] as the branch
identifier for the branch to C, and [B, 1] for the branch to D. The
identifier is carried with the multicast packet until the next branch
fork node. Each node MUST export the branch identifier in the
received IOAM DEX header in the postcards it sends. The branch
identifier, along with the other fields such as Flow ID and Sequence
Number, is sufficient for the data collector to reconstruct the
topology of the multicast tree.
Figure 1 shows an example of this solution. "P" stands for the
postcard packet. The square brackets contains the branch identifier.
The curly braces contain the telemetry data about a specific node.
P:[A,0]{A} P:[A,0]{B} P:[B,1]{D} P:[B,0]{C} P:[B,0]{E}
^ ^ ^ ^ ^
: : : : :
: : : : :
: : : +-:-+ +-:-+
: : : | | | |
: : +---:----->| C |------>| E |-...
+-:-+ +-:-+ | : | | | |
| | | |----+ : +---+ +---+
| A |------->| B | :
| | | |--+ +-:-+
+---+ +---+ | | |
+-->| D |--...
| |
+---+
Figure 1: Per-Hop Postcard
Each branch fork node needs to generate a unique branch identifier
(i.e., Multicast Branch ID) for each branch in its multicast tree
instance and include it in the IOAM DEX Option-Type header. The
Multicast Branch ID remains unchanged until the next branch fork
node. The Multicast Branch ID contains two parts: the Branching Node
ID and an Interface Index.
Conforming to the node ID specification in IOAM [RFC9197], the
Branching Node ID is a 3-octet unsigned integer. The Interface Index
is a two-octet unsigned integer. As shown in Figure 2, the Multicast
Branch ID consumes 8 octets in total. The three unused octets MUST
be set to 0; otherwise, the header is considered malformed and the
packet MUST be dropped.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Branching Node ID | unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Interface Index | unused |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Multicast Branch ID Format
Figure 3 shows that the Multicast Branch ID is carried as an optional
field after the Flow ID and Sequence Number optional fields in the
IOAM DEX option header. Two bits "N" and "I" (i.e., the third and
fourth bits in the Extension-Flags field) are reserved to indicate
the presence of the optional Multicast Branch ID field. "N" stands
for the Branching Node ID, and "I" stands for the Interface Index.
If "N" and "I" are both set to 1, the optional Multicast Branch ID
field is present. Two Extension-Flag bits are used because [RFC9326]
specifies that each extension flag only indicates the presence of a
4-octet optional data field, while we need more than 4 octets to
encode the Multicast Branch ID. The two flag bits MUST be both set
or cleared; otherwise, the header is considered malformed and the
packet MUST be dropped.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Namespace-ID | Flags |F|S|N|I|E-Flags|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IOAM-Trace-Type | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Flow ID (optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence Number (optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Multicast Branch ID (as shown in Figure 2) |
| (optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Carrying the Multicast Branch ID in the IOAM DEX
Option-Type Header
Once a node gets the branch ID information from the upstream node, it
MUST carry this information in its telemetry data export postcards so
the original multicast tree can be correctly reconstructed based on
the postcards.
4.2. Per-Section Postcard for IOAM Trace
The second solution is a combination of the IOAM trace option
[RFC9197] and the postcard-based telemetry [IFIT-FRAMEWORK]. To
avoid data redundancy, at each branch fork node, the trace data
accumulated up to this node is exported by a postcard before the
packet is replicated. In this solution, each branch also needs to
maintain some identifier to help correlate the postcards for each
tree section. The natural way to accomplish this is to simply carry
the branch fork node's data (including its ID) in the trace of each
branch. This is also necessary because each replicated multicast
packet can have different telemetry data pertaining to this
particular copy (e.g., node delay, egress timestamp, and egress
interface). As a consequence, the local data exported by each branch
fork node can only contain the common data shared by all the
replicated packets (e.g., ingress interface and ingress timestamp).
Figure 4 shows an example in a segment of a multicast tree. Node B
and D are two branch fork nodes, and they will export a postcard
covering the trace data for the previous section. The end node of
each path will also need to export the data of the last section as a
postcard.
P:{A,B'} P:{B1,C,D'}
^ ^
: :
: :
: : {D1}
: : +--...
: +---+ +---+ |
: {B1} | |{B1,C}| |--+ {D2}
: +-->| C |----->| D |-----...
+---+ +---+ | | | | |--+
| | {A} | |--+ +---+ +---+ |
| A |---->| B | +--...
| | | |--+ +---+ {D3}
+---+ +---+ | | |{B2,E}
+-->| E |--...
{B2} | |
+---+
Figure 4: Per-Section Postcard
There is no need to modify the IOAM trace option header format as
specified in [RFC9197]. We just need to configure the branch fork
nodes, as well as the leaf nodes, to export the postcards that
contain the trace data collected so far and refresh the IOAM header
and data in the packet (e.g., clear the node data list to all zeros
and reset the RemainingLen field to the initial value).
5. Application Considerations for Multicast Protocols
5.1. Mtrace Version 2
Mtrace version 2 (Mtrace2) [RFC8487] is a protocol that allows the
tracing of an IP multicast routing path. Mtrace2 provides additional
information such as the packet rates and losses, as well as other
diagnostic information. Unlike unicast traceroute, Mtrace2 traces
the path that the tree-building messages follow from the receiver to
the source. An Mtrace2 client sends an Mtrace2 Query to a Last-Hop
Router (LHR), and the LHR forwards the packet as an Mtrace2 Request
towards the source or a Rendezvous Point (RP) after appending a
response block. Each router along the path proceeds with the same
operations. When the First-Hop Router (FHR) receives the Request
packet, it appends its own response block, turns the Request packet
into a Reply, and unicasts the Reply back to the Mtrace2 client.
New on-path telemetry techniques will enhance Mtrace2, and other
existing OAM solutions, with more granular and real-time network
status data through direct measurements. There are various multicast
protocols that are used to forward the multicast data. Each will
require its own unique on-path telemetry solution. Mtrace2 doesn't
integrate with IOAM directly, but network management systems may use
Mtrace2 to learn about routers of interest.
5.2. Application in PIM
PIM - Sparse Mode (PIM-SM) [RFC7761] is the most widely used
multicast routing protocol deployed today. PIM - Source-Specific
Multicast (PIM-SSM), however, is the preferred method due to its
simplicity and removal of network source discovery complexity. With
PIM, control plane state is established in the network in order to
forward multicast UDP data packets. PIM utilizes network-based
source discovery. PIM-SSM, however, utilizes application-based
source discovery. IP multicast packets fall within the range of
224.0.0.0 through 239.255.255.255 for IPv4 and ff00::/8 for IPv6.
The telemetry solution will need to work within these IP address
ranges and provide telemetry data for this UDP traffic.
A proposed solution for encapsulating the telemetry instruction
header and metadata in IPv6 packets is described in [RFC9486].
5.3. Application of MVPN PMSI Tunnel Attribute
IOAM, and the recommendations of this document, are equally
applicable to multicast MPLS forwarded packets as described in
[RFC6514]. Multipoint Label Distribution Protocol (mLDP), P2MP RSVP-
TE, Ingress Replication (IR), and PIM Multicast Distribution Tree
(MDT) SAFI with GRE Transport are all commonly used within a
Multicast VPN (MVPN) environment utilizing MVPN procedures such as
multicast in MPLS/BGP IP VPNs [RFC6513] and BGP encoding and
procedures for multicast in MPLS/BGP IP VPNs [RFC6514]. mLDP LDP
extensions for P2MP and multipoint-to-multipoint (MP2MP) label
switched paths (LSPs) [RFC6388] provide extensions to LDP to
establish point-to-multipoint (P2MP) and MP2MP LSPs in MPLS networks.
The telemetry solution will need to be able to follow these P2MP and
MP2MP paths. The telemetry instruction header and data should be
encapsulated into MPLS packets on P2MP and MP2MP paths.
6. Security Considerations
The schemes discussed in this document share the same security
considerations for the IOAM trace option [RFC9197] and the IOAM DEX
option [RFC9326]. In particular, since multicast has a built-in
nature for packet amplification, the possible amplification risk for
the DEX-based scheme is greater than the case of unicast. Hence,
stricter mechanisms for protections need to be applied. In addition
to selecting packets to enable DEX and to limit the exported traffic
rate, we can also allow only a subset of the nodes in a multicast
tree to process the option and export the data (e.g., only the
branching nodes in the multicast tree are configured to process the
option).
7. IANA Considerations
IANA has registered two Extension-Flags, as described in Section 4.1,
in the "IOAM DEX Extension-Flags" registry.
+=====+=====================================+===========+
| Bit | Description | Reference |
+=====+=====================================+===========+
| 2 | Multicast Branching Node ID | This RFC |
+-----+-------------------------------------+-----------+
| 3 | Multicast Branching Interface Index | This RFC |
+-----+-------------------------------------+-----------+
Table 1: IOAM DEX Extension-Flags
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC6388] Wijnands, IJ., Ed., Minei, I., Ed., Kompella, K., and B.
Thomas, "Label Distribution Protocol Extensions for Point-
to-Multipoint and Multipoint-to-Multipoint Label Switched
Paths", RFC 6388, DOI 10.17487/RFC6388, November 2011,
<https://www.rfc-editor.org/info/rfc6388>.
[RFC6513] Rosen, E., Ed. and R. Aggarwal, Ed., "Multicast in MPLS/
BGP IP VPNs", RFC 6513, DOI 10.17487/RFC6513, February
2012, <https://www.rfc-editor.org/info/rfc6513>.
[RFC6514] Aggarwal, R., Rosen, E., Morin, T., and Y. Rekhter, "BGP
Encodings and Procedures for Multicast in MPLS/BGP IP
VPNs", RFC 6514, DOI 10.17487/RFC6514, February 2012,
<https://www.rfc-editor.org/info/rfc6514>.
[RFC7761] Fenner, B., Handley, M., Holbrook, H., Kouvelas, I.,
Parekh, R., Zhang, Z., and L. Zheng, "Protocol Independent
Multicast - Sparse Mode (PIM-SM): Protocol Specification
(Revised)", STD 83, RFC 7761, DOI 10.17487/RFC7761, March
2016, <https://www.rfc-editor.org/info/rfc7761>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC9197] Brockners, F., Ed., Bhandari, S., Ed., and T. Mizrahi,
Ed., "Data Fields for In Situ Operations, Administration,
and Maintenance (IOAM)", RFC 9197, DOI 10.17487/RFC9197,
May 2022, <https://www.rfc-editor.org/info/rfc9197>.
[RFC9326] Song, H., Gafni, B., Brockners, F., Bhandari, S., and T.
Mizrahi, "In Situ Operations, Administration, and
Maintenance (IOAM) Direct Exporting", RFC 9326,
DOI 10.17487/RFC9326, November 2022,
<https://www.rfc-editor.org/info/rfc9326>.
8.2. Informative References
[HYBRID-TWO-STEP]
Mirsky, G., Lingqiang, W., Zhui, G., Song, H., and P.
Thubert, "Hybrid Two-Step Performance Measurement Method",
Work in Progress, Internet-Draft, draft-ietf-ippm-hybrid-
two-step-01, 5 July 2024,
<https://datatracker.ietf.org/doc/html/draft-ietf-ippm-
hybrid-two-step-01>.
[IFIT-FRAMEWORK]
Song, H., Qin, F., Chen, H., Jin, J., and J. Shin,
"Framework for In-situ Flow Information Telemetry", Work
in Progress, Internet-Draft, draft-song-opsawg-ifit-
framework-21, 23 October 2023,
<https://datatracker.ietf.org/doc/html/draft-song-opsawg-
ifit-framework-21>.
[MULTICAST-LESSONS-LEARNED]
Farinacci, D., Giuliano, L., McBride, M., and N. Warnke,
"Multicast Lessons Learned from Decades of Deployment
Experience", Work in Progress, Internet-Draft, draft-ietf-
pim-multicast-lessons-learned-04, 22 July 2024,
<https://datatracker.ietf.org/doc/html/draft-ietf-pim-
multicast-lessons-learned-04>.
[POSTCARD-TELEMETRY]
Song, H., Mirsky, G., Zhou, T., Li, Z., Graf, T., Mishra,
G., Shin, J., and K. Lee, "On-Path Telemetry using Packet
Marking to Trigger Dedicated OAM Packets", Work in
Progress, Internet-Draft, draft-song-ippm-postcard-based-
telemetry-16, 2 June 2023,
<https://datatracker.ietf.org/doc/html/draft-song-ippm-
postcard-based-telemetry-16>.
[RFC0792] Postel, J., "Internet Control Message Protocol", STD 5,
RFC 792, DOI 10.17487/RFC0792, September 1981,
<https://www.rfc-editor.org/info/rfc792>.
[RFC3605] Huitema, C., "Real Time Control Protocol (RTCP) attribute
in Session Description Protocol (SDP)", RFC 3605,
DOI 10.17487/RFC3605, October 2003,
<https://www.rfc-editor.org/info/rfc3605>.
[RFC6450] Venaas, S., "Multicast Ping Protocol", RFC 6450,
DOI 10.17487/RFC6450, December 2011,
<https://www.rfc-editor.org/info/rfc6450>.
[RFC8487] Asaeda, H., Meyer, K., and W. Lee, Ed., "Mtrace Version 2:
Traceroute Facility for IP Multicast", RFC 8487,
DOI 10.17487/RFC8487, October 2018,
<https://www.rfc-editor.org/info/rfc8487>.
[RFC9486] Bhandari, S., Ed. and F. Brockners, Ed., "IPv6 Options for
In Situ Operations, Administration, and Maintenance
(IOAM)", RFC 9486, DOI 10.17487/RFC9486, September 2023,
<https://www.rfc-editor.org/info/rfc9486>.
Acknowledgments
The authors would like to thank Gunter Van de Velde, Brett Sheffield,
Éric Vyncke, Frank Brockners, Nils Warnke, Jake Holland, Dino
Farinacci, Henrik Nydell, Zaheduzzaman Sarker, and Toerless Eckert
for their comments and suggestions.
Authors' Addresses
Haoyu Song
Futurewei Technologies
2330 Central Expressway
Santa Clara, CA
United States of America
Email: hsong@futurewei.com
Mike McBride
Futurewei Technologies
2330 Central Expressway
Santa Clara, CA
United States of America
Email: mmcbride@futurewei.com
Greg Mirsky
Ericsson
United States of America
Email: gregimirsky@gmail.com
Gyan Mishra
Verizon Inc.
United States of America
Email: gyan.s.mishra@verizon.com
Hitoshi Asaeda
National Institute of Information and Communications Technology
Japan
Email: asaeda@nict.go.jp