< draft-xie-bier-ipv6-mvpn-00.txt   draft-xie-bier-ipv6-mvpn-01.txt >
Network Working Group J. Xie Network Working Group J. Xie
Internet-Draft M. McBride Internet-Draft Huawei Technologies
Intended status: Standards Track S. Dhanaraj Intended status: Standards Track M. McBride
Expires: September 12, 2019 Huawei Technologies Expires: January 2, 2020 Futurewei
S. Dhanaraj
Huawei Technologies
L. Geng L. Geng
China Mobile China Mobile
March 11, 2019 July 1, 2019
Use of BIER IPv6 Encapsulation (BIERv6) for Multicast VPN in Non-MPLS Use of BIER IPv6 Encapsulation (BIERv6) for Multicast VPN in IPv6
IPv6 networks networks
draft-xie-bier-ipv6-mvpn-00 draft-xie-bier-ipv6-mvpn-01
Abstract Abstract
This draft defines the procedures and messages for using Bit Index This draft defines the procedures and messages for using Bit Index
Explicit Replication (BIER) for Multicast VPN Services in Non-MPLS Explicit Replication (BIER) for Multicast VPN Services in IPv6
IPv6 networks using the BIER IPv6 encapsulation. It provides a networks using the BIER IPv6 encapsulation. It provides a migration
migration path for Multicast VPN service using BIER MPLS path for Multicast VPN service using BIER MPLS encapsulation in MPLS
encapsulation in MPLS networks to multicast VPN service using BIER networks to multicast VPN service using BIER IPv6 encapsulation
IPv6 encapsulation (BIERv6) in Non-MPLS IPv6 networks. (BIERv6) in IPv6 networks.
Requirements Language Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119] and document are to be interpreted as described in [RFC2119] and
[RFC8174]. [RFC8174].
Status of This Memo Status of This Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
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Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 12, 2019. This Internet-Draft will expire on January 2, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
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to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use of PTA and Prefix-SID Attribute in x-PMSI A-D Routes . . 4 3. Use of PTA and Prefix-SID Attribute in x-PMSI A-D Routes . . 4
4. MVPN over BIERv6 Core . . . . . . . . . . . . . . . . . . . . 5 4. MVPN over BIERv6 Core . . . . . . . . . . . . . . . . . . . . 4
5. GTM over BIERv6 Core . . . . . . . . . . . . . . . . . . . . 7 5. GTM over BIERv6 Core . . . . . . . . . . . . . . . . . . . . 7
6. Data Plane . . . . . . . . . . . . . . . . . . . . . . . . . 8 6. Data Plane . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.1. Encapsulation of Multicast Traffic . . . . . . . . . . . 8 6.1. Encapsulation of Multicast Traffic . . . . . . . . . . . 8
6.2. MTU . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.2. MTU . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3. TTL . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.3. TTL . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9 7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . 9 10.1. Normative References . . . . . . . . . . . . . . . . . . 10
10.2. Informative References . . . . . . . . . . . . . . . . . 10 10.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction 1. Introduction
Bit Index Explicit Replication (BIER) [RFC8279] is an architecture Bit Index Explicit Replication (BIER) [RFC8279] is an architecture
that provides optimal multicast forwarding without requiring that provides optimal multicast forwarding without requiring
intermediate routers to maintain any per-flow state by using a intermediate routers to maintain any per-flow state by using a
multicast-specific BIER header. BIERv6 refers to the deployment of multicast-specific BIER header. BIERv6 refers to the deployment of
BIER in Non-MPLS IPv6 networks using the BIER IPv6 encapsulation BIER in IPv6 networks using the BIER IPv6 encapsulation format
format defined in [I-D.xie-bier-ipv6-encapsulation]. defined in [I-D.xie-bier-ipv6-encapsulation].
SRv6 explained in [I-D.ietf-spring-segment-routing] refers to the [I-D.ietf-spring-srv6-network-programming] introduces the Network
deployment of segment routing in Non-MPLS IPv6 networks.
[I-D.filsfils-spring-srv6-network-programming] introduces the Network
programming concepts in SRv6 networks and explains how the 128-bit programming concepts in SRv6 networks and explains how the 128-bit
IPv6 address can be used as SRv6 SID in the format LOC:FUNCT, where IPv6 address can be used as SRv6 SID in the format LOC:FUNCT, where
LOC part of the SID is routable, while FUNCT part of the SID is an LOC part of the SID is routable, while FUNCT part of the SID is an
opaque identification of a local function bound to the SID. It has opaque identification of a local function bound to the SID. It has
also defined some well known standard functions like End.DT4 - also defined some well known standard functions like End.DT4 -
Endpoint with decaps and IPv4 table lookup for L3VPN (equivalent to Endpoint with decaps and IPv4 table lookup for L3VPN (equivalent to
per-VRF VPN label). [I-D.dawra-idr-srv6-vpn] defines the TLVs to per-VRF VPN label).
associate a function like End.DT4 with the L3VPN Unicast routes
advertised via BGP. It also details how the functions of End.DT4, [I-D.dawra-bess-srv6-services] defines the TLVs to associate a
End.DT6, End.DT46 (End.DTx) can be used to identify a L3VPN/EVPN function like End.DT4 with the L3VPN Unicast routes advertised via
instead of using a VPN Label in MPLS-VPN [RFC4364] of the received BGP. It also details how the functions of End.DT4, End.DT6, End.DT46
data packet and thereby realize the L3VPN Services in the SRv6 (End.DTx) can be used to identify a L3VPN/EVPN instead of using a VPN
Networks. However, it covers unicast services exclusively. Label in MPLS-VPN [RFC4364] of the received data packet and thereby
realize the L3VPN Services in the SRv6 Networks. However, it covers
unicast services exclusively.
This document describes a method to realize MVPN services using BIER This document describes a method to realize MVPN services using BIER
as a P-tunnel in the BIERv6 Networks. It defines a method to use an as a P-tunnel in the IPv6 Networks (BIERv6 Networks). It defines a
SRv6 Service SID like End.DTx as source address to identify the MVPN method to use an SRv6 Service SID, called Src.DTx in this document,
instance at the Egress PE. While the End.DTx is used as IPv6 as source address of an IPv6 header, to identify the MVPN instance at
destination address in unicast L3VPN scenarios as defined in the Egress PE. The LOC part and FUNCT part of this SRv6 Service SID
[I-D.dawra-idr-srv6-vpn], this document extends the use of End.DTx as represent the context and the upstream-assigned VPN Label
IPv6 source address. The LOC part and FUNCT part of this SRv6 respectively in MVPN scenario's as defined in [RFC8556].
Service SID represent the context and the upstream-assigned VPN Label
respectively in MVPN scenario's as defined in [I-D.ietf-bier-mvpn].
In particular, MVPN deployment in Non-MPLS IPv6 networks relies on In particular, MVPN deployment in IPv6 networks relies on L3VPN
L3VPN deployment on Non-MPLS IPv6 networks firstly, thus the deployment on IPv6 networks firstly, thus the c-multicast routing
c-multicast routing procedure like UMH Selection can be done. The procedure like UMH Selection can be done. The L3VPN deployment in
L3VPN deployment in Non-MPLS IPv6 networks can be referred to IPv6 networks can be referred to [I-D.dawra-bess-srv6-services].
[I-D.dawra-idr-srv6-vpn].
GTM defined in [RFC7716] is also covered in this document, as GTM GTM defined in [RFC7716] is also covered in this document, as GTM
shares the same BGP-MVPN signaling, while providing an approach of shares the same BGP-MVPN signaling, while providing an approach of
Non-VPN multicast over a service provider core with various P-tunnel Non-VPN multicast over a service provider core with various P-tunnel
type. For the same reason of UMH selection, and the requirement of type. For the same reason of UMH selection, and the requirement of
basic operation like ping (e.g, to the multicast source address), the basic operation like ping (e.g, to the multicast source address), the
Global IPv4/IPv6 over SRv6 Core as described in Global IPv4/IPv6 over SRv6 Core as described in
[I-D.dawra-idr-srv6-vpn] is also required, and the [RFC5549] may be [I-D.dawra-bess-srv6-services] is also required.
required further.
2. Terminology 2. Terminology
Readers of this document are assumed to be familiar with the Readers of this document are assumed to be familiar with the
terminology and concepts of the documents listed as Normative terminology and concepts of the documents listed as Normative
References. Additionally the following terms are used through out References. Additionally the following terms are used through out
the document. the document.
o BIERv6 - BIER in Non-MPLS IPv6 networks using the BIER IPv6 o BIERv6 - BIER in IPv6 networks using the BIERv6 encapsulation
encapsulation format defined in [I-D.xie-bier-ipv6-encapsulation]. format defined in [I-D.xie-bier-ipv6-encapsulation].
o SRv6 - Segment Routing instantiated on the IPv6 dataplane as o SRv6 - Segment Routing instantiated on the IPv6 dataplane as
defined in [I-D.filsfils-spring-srv6-network-programming]. defined in [I-D.ietf-spring-srv6-network-programming].
o SRv6 SID - SRv6 Segment Identifier as defined in o SRv6 SID - SRv6 Segment Identifier as defined in
[I-D.filsfils-spring-srv6-network-programming]. [I-D.ietf-spring-srv6-network-programming].
o End.DTx - Refers to the functions End.DT6, End.DT4, End.DT46 o End.DTx - Refers to the functions End.DT6, End.DT4, End.DT46
defined in [I-D.filsfils-spring-srv6-network-programming]. defined in [I-D.ietf-spring-srv6-network-programming].
o SRv6 L3 Service - L3VPN/Global-L3 service in Non-MPLS SRv6 network o Src.DTx - Refers to the functions Src.DT4, Src.DT6, Src.DT46
defined in [I-D.dawra-idr-srv6-vpn], or MVPN/GTM service in Non- defind in this document.
MPLS BIERv6 network defined in this document.
o SRv6 L3 Service - L3VPN/Global-L3 service in SRv6 networks defined
in [I-D.dawra-bess-srv6-services], or MVPN/GTM service in BIERv6
networks defined in this document.
3. Use of PTA and Prefix-SID Attribute in x-PMSI A-D Routes 3. Use of PTA and Prefix-SID Attribute in x-PMSI A-D Routes
The BGP-MVPN I-PMSI A-D (Type 1) or S-PMSI A-D (Type 3) route (called The BGP-MVPN I-PMSI A-D (Type 1) or S-PMSI A-D (Type 3) route (called
x-PMSI A-D route in this document), advertised by Ingress PE carries x-PMSI A-D route in this document), advertised by Ingress PE carries
the BIER (Type 11) PTA as specified in [I-D.ietf-bier-mvpn]. The the BIER (Type 11) PTA as specified in [RFC8556]. The BIER PTA
BIER PTA carried in the x-PMSI A-D route is used for explicitly carried in the x-PMSI A-D route is used for explicitly tracking the
tracking the receiver-site PEs which are interested in a specific receiver-site PEs which are interested in a specific multicast flow.
multicast flow. It includes three BIER-specific fields, Sub-domain- It includes three BIER-specific fields, Sub-domain-id, BFR-id, and
id, BFR-id, and BFR-prefix. For BIER P-tunnel using the BIERv6 BFR-prefix. For BIER P-tunnel using the BIERv6 encapsulation in IPv6
encapsulation in IPv6 networks, the BFR-prefix field in the PTA MUST networks, the BFR-prefix field in the PTA MUST be set to the BFIR
be set to the BFIR IPv6 prefix and the MPLS Label field in the PTA IPv6 prefix and the MPLS Label field in the PTA MUST set to 0. For
MUST set to 0. For MVPN over BIERv6, the End.DTx IPv6 address of the MVPN over BIERv6, the Src.DTx IPv6 address of the BFIR is used to
BFIR is used to identify the VRF instead of a MPLS Label. The identify the VRF instead of an MPLS Label. The Src.DTx IPv6 Address
End.DTx IPv6 Address (End.DT6 or End.DT4 or End.DT46) MUST be carried (Src.DT6 or Src.DT4 or Src.DT46) MUST be carried within an SRv6 L3
within an SRv6 L3 Service TLV [I-D.dawra-idr-srv6-vpn] of BGP Prefix- Service TLV [I-D.dawra-bess-srv6-services] of BGP Prefix-SID
SID attribute in the x-PMSI A-D route. attribute in the x-PMSI A-D route.
The Ingress PE encapsulates the c-multicast IP packet with BIERv6 The Ingress PE encapsulates the c-multicast IP packet with BIERv6
header and the source address in the outer IPv6 header will be set to header and the source address in the outer IPv6 header will be set to
the End.DTx IPv6 address advertised in the BGP-MVPN x-PMSI A-D the Src.DTx IPv6 address advertised in the BGP-MVPN x-PMSI A-D
routes. See section 3 of [I-D.xie-bier-ipv6-encapsulation] for the routes. See section 3 of [I-D.xie-bier-ipv6-encapsulation] for the
detailed packet format. detailed packet format.
Egress PE (BFER) receiving the x-PMSI A-D routes with BIER PTA and Egress PE (BFER) receiving the x-PMSI A-D routes with BIER PTA and
SRv6 L3 Service TLV learns the End.DTx IPv6 address and uses it to SRv6 L3 Service TLV learns the Src.DTx IPv6 address and uses it to
identify the VRF of the c-multicast packet. identify the VRF of the c-multicast packet.
When Egress PE receives a BIERv6 packet and the self bfr-id is set in When Egress PE receives a BIERv6 packet and the self bfr-id is set in
the bit-string field of the Non-MPLS BIER header, it retrieves the the bit-string field of the BIERv6 header, it retrieves the Src.DTx
End.DTx IPv6 address from the source address of the IPv6 header to IPv6 address from the source address of the IPv6 header to determine
determine the VRF and the Address Family (AF) of the c-multicast data the VRF and the Address Family (AF) of the c-multicast data packet,
packet, and performs the MFIB lookup in the corresponding table. and performs the MFIB lookup in the corresponding table.
4. MVPN over BIERv6 Core 4. MVPN over BIERv6 Core
[I-D.ietf-bier-mvpn] specifies the protocol and procedures to be [RFC8556] specifies the protocol and procedures to be followed by the
followed by the Ingress and Egress PEs to use BIER as a P-tunnel for Ingress and Egress PEs to use BIER as a P-tunnel for MVPN in MPLS
MVPN in MPLS networks. This section specifies the required changes networks. This section specifies the required changes and procedures
and procedures in addition to support BIER as a P-tunnel in Non-MPLS in addition to support BIER as a P-tunnel in IPv6 networks using
IPv6 networks. BIERv6.
In a Non-MPLS IPv6 service provider network, many of the IP address In a IPv6 service provider network, many of the IP address fields
fields used in the BGP-MVPN routes are IPv6 address as specified in used in the BGP-MVPN routes are IPv6 address as specified in
[RFC6515]. These are listed below. [RFC6515]. These are listed below.
o "Originating Router's IP Address" in the NLRI of Type 1 or Type 3 o "Originating Router's IP Address" in the NLRI of Type 1 or Type 3
BGP-MVPN route is an IPv6 address. BGP-MVPN route is an IPv6 address.
o "Network Address of Next Hop" field in the MP_REACH_NLRI attribute o "Network Address of Next Hop" field in the MP_REACH_NLRI attribute
is an IPv6 address. is an IPv6 address.
o Route Targets Extended Community (EC) used in C-multicast join o Route Targets Extended Community (EC) used in C-multicast join
(Type 6 or 7) route or Leaf A-D (Type 5) route is an IPv6 Address (Type 6 or 7) route or Leaf A-D (Type 5) route is an IPv6 Address
Specific Extended Community, where the Global Administrator field Specific Extended Community, where the Global Administrator field
will be an IPv6 address identifies the Upstream PE or the UMH. will be an IPv6 address identifies the Upstream PE or the UMH.
o "VRF Route Import Extended Community (EC)" carried by unicast VPN- o "VRF Route Import Extended Community (EC)" carried by unicast VPN-
IPv4 or VPN-IPv6 routes as [RFC6515] specifies, or SAFI 1, 2, or 4 IPv4 or VPN-IPv6 routes as [RFC6515] specifies, or SAFI 1, 2, or 4
unicast routes, or MVPN (SAFI 5) Source-Active routes as [RFC7716] unicast routes, or MVPN (SAFI 5) Source-Active routes as [RFC7716]
specifies. specifies.
On the Ingress PE (BFIR), the BGP-MVPN x-PMSI A-D route is On the Ingress PE (BFIR), the BGP-MVPN x-PMSI A-D route is
constructed as per the procedures specified in [I-D.ietf-bier-mvpn] constructed as per the procedures specified in [RFC8556] and with the
and with the following specifications. following specifications.
o MPLS Label field in the BIER PTA MUST be set to Zero. o MPLS Label field in the BIER PTA MUST be set to Zero.
o BFR-prefix field in the BIER PTA MUST be set to the Ingress PEs o BFR-prefix field in the BIER PTA MUST be set to the Ingress PEs
(BFIR) IPv6 BFR-Prefix Address. It does not need to be the same (BFIR) IPv6 BFR-Prefix Address. It does not need to be the same
as the other IPv6 address of the x-PMSI AD route. as the other IPv6 address of the x-PMSI AD route.
o Route MUST also carry an BGP Prefix SID attribute with an SRv6 L3 o Route MUST also carry an BGP Prefix SID attribute with an SRv6 L3
Service TLV carrying an End.DTx IPv6 address uniquely identifying Service TLV carrying an Src.DTx IPv6 address uniquely identifying
the MVPN instance. the MVPN instance.
If the VPN is IPv4 VPN, the End.DTx can be either End.DT4 or If the MVPN is IPv4 MVPN, the Src.DTx can be either Src.DT4 or
End.DT46. If the VPN is IPv6 VPN, the End.DTx can be either End.DT6 Src.DT46. If the MVPN is IPv6 MVPN, the Src.DTx can be either
or End.DT46. By default, the distribution of the x-PMSI A-D routes Src.DT6 or Src.DT46. The distribution of the x-PMSI A-D routes uses
uses the same End.DTx as the ones used for the distribution of VPN-IP the Src.DTx according to the local configuration, and is independent
unicast routes. That is, by default, the x-PMSI A-D route MUST carry to the use of End.DTx in VPN-IP unicast routes of this VPN. For
the same SRv6-Service-SID used by the unicast routing for L3VPN. The example, one can use End.DT46 for VPNv4 and VPNv6 unicast routes, but
default could be modified via configuration by having a End.DTx used use Src.DT4 for the MVPN routes for the same VPN. Another example,
for the BGP-MVPN x-PMSI A-D routes being distinct from the ones used one can use End.DX for VPNv4 unicast routes, but use Src.DT46 for the
for the VPN-IP unicast routes. MVPN routes for the same VPN.
BFIR MAY carry the BGP Prefix-SID attribute only in I-PMSI A-D route BFIR MAY carry the BGP Prefix-SID attribute only in I-PMSI A-D route
when I-PMSI A-D route is used, while other S-PMSI A-D routes do not when I-PMSI A-D route is used, while other S-PMSI A-D routes do not
carry the BGP Prefix-SID attribute. carry the BGP Prefix-SID attribute.
BFIR MAY carry the BGP Prefix-SID attribute only in wildcard S-PMSI BFIR MAY carry the BGP Prefix-SID attribute only in wildcard S-PMSI
A-D routes when the "S-PMSI Only" mode as described in [RFC6625] is A-D routes when the "S-PMSI Only" mode as described in [RFC6625] is
used, while other S-PMSI A-D routes do not carry the BGP Prefix-SID used, while other S-PMSI A-D routes do not carry the BGP Prefix-SID
attribute. attribute.
On the Egress PE (BFER), the BGP-MVPN x-PMSI A-D route is processed On the Egress PE (BFER), the BGP-MVPN x-PMSI A-D route is processed
as per the procedures specified in [I-D.ietf-bier-mvpn] and with the as per the procedures specified in [RFC8556] and with the following
following specifications: specifications:
o The MPLS Label field in the BIER PTA of the BGP-MVPN x-PMSI A-D o The MPLS Label field in the BIER PTA of the BGP-MVPN x-PMSI A-D
route MUST be ignored and MUST not be used for the identification route MUST be ignored and MUST not be used for the identification
of the VRF. of the VRF.
o The BGP-MVPN x-PMSI A-D route MUST be dropped if the BFR-prefix o The BGP-MVPN x-PMSI A-D route MUST be dropped if the BFR-prefix
field in the BIER PTA is not an IPv6 address. field in the BIER PTA is not an IPv6 address.
o The BGP-MVPN x-PMSI A-D route MUST be dropped if it does not carry o The BGP-MVPN x-PMSI A-D route MUST be dropped if it does not carry
a End.DTx IPv6 address in the SRv6 L3 Service TLV in BGP Prefix a Src.DTx IPv6 address in the SRv6 L3 Service TLV in BGP Prefix
SID attribute. SID attribute.
o Leaf A-D route originated by the Egress PE (BFER) MUST carry the o Leaf A-D route originated by the Egress PE (BFER) MUST carry the
BIER PTA with the BFR-prefix field set to the BFER IPv6 BFR- BIER PTA with the BFR-prefix field set to the BFER IPv6 BFR-
prefix. prefix.
Valid BGP-MVPN x-PMSI A-D route received by an Egress PE (BFER) is Valid BGP-MVPN x-PMSI A-D route received by an Egress PE (BFER) is
stored locally, and the End.DTx IPv6 Address carried in the SRv6 L3 stored locally, and the Src.DTx IPv6 Address carried in the SRv6 L3
service TLV is used to identify the VRF of a c-multicast data packet. service TLV is used to identify the VRF of a c-multicast data packet.
This may be populated into forwarding table only when there is This may be populated into forwarding table only when there is
c-multicast flow state with UMH of the specific BFIR this End.DTx c-multicast flow state with UMH of the specific BFIR this Src.DTx
located in. located in.
If more than one x-PMSI A-D routes belonging to the same VRF has If more than one x-PMSI A-D routes belonging to the same VRF has
different End.DTx value, the processing is determined by the local different Src.DTx value, the processing is determined by the local
policy of the BFER. policy of the BFER.
If more than one x-PMSI A-D routes belonging to different VRF has the If more than one x-PMSI A-D routes belonging to different VRF has the
same End.DTx value, the BFER must log an error, and a BIERv6 packet same Src.DTx value, the BFER must log an error, and a BIERv6 packet
with this End.DTx as the IPv6 source address MUST be dropped. with this Src.DTx as the IPv6 source address MUST be dropped.
The BGP Prefix-SID attribute (which may include the End.DTx in SRv6 The BGP Prefix-SID attribute (which may include the Src.DTx in SRv6
L3 Service TLV) MUST NOT be carried in Leaf A-D route upon sending, L3 Service TLV) MUST NOT be carried in Leaf A-D route upon sending,
and MUST be ignored upon reception. and MUST be ignored upon reception.
5. GTM over BIERv6 Core 5. GTM over BIERv6 Core
As specified in [RFC7716], Global Table Multicast (GTM) uses the same As specified in [RFC7716], Global Table Multicast (GTM) uses the same
Subsequent Address Family Identifier (SAFI) value, the same Network Subsequent Address Family Identifier (SAFI) value, the same Network
Layer Reachability Information (NLRI) format, and the same procedures Layer Reachability Information (NLRI) format, and the same procedures
of MVPN with only a few adaptions. It support for both IPv4 and IPv6 of MVPN with only a few adaptions. It support for both IPv4 and IPv6
multicast flows over either an IPv4 or IPv6 SP infrastructure. GTM multicast flows over either an IPv4 or IPv6 SP infrastructure. GTM
over BIERv6 core is obviously a case of IPv4/IPv6 multicast over an over BIERv6 core is obviously a case of IPv4/IPv6 multicast over an
IPv6 SP infrastructure with BIERv6 data-plane. IPv6 SP infrastructure with BIERv6 data-plane.
The BIER (Type 11) PTA attribute and the BGP Prefix-SID attribute are The BIER (Type 11) PTA attribute and the BGP Prefix-SID attribute are
carried in the x-PMSI A-D route in GTM cases. When the a BGP-MVPN carried in the x-PMSI A-D route in GTM cases. When the a BGP-MVPN
x-PMSI A-D route is received by Egress PE, it is stored locally, and x-PMSI A-D route is received by Egress PE, it is stored locally, and
the End.DTx IPv6 Address of the Ingress PE in the route is used to the Src.DTx IPv6 Address of the Ingress PE in the route is used to
determine the VRF of a packet, which is the 'public' VRF in the case determine the VRF of a packet, which is the 'public' VRF in the case
of GTM. of GTM.
There are some other attributes listed below for GTM over a BIERv6 There are some other attributes listed below for GTM over a BIERv6
core: core:
o Route Distinguishers - the RD field of a BGP-MVPN route's NLRI o Route Distinguishers - the RD field of a BGP-MVPN route's NLRI
MUST be set to zero (i.e., to 64 bits of zero) to represent a Non- MUST be set to zero (i.e., to 64 bits of zero) to represent a Non-
VPN GTM. See section 2.2 of [RFC7716]. VPN GTM. See section 2.2 of [RFC7716].
skipping to change at page 8, line 6 skipping to change at page 8, line 4
either used in UMH-eligible unicast routes having a SAFI of 1, 2, either used in UMH-eligible unicast routes having a SAFI of 1, 2,
or 4, or used in the MVPN (SAFI of 5) Source Active A-D route. or 4, or used in the MVPN (SAFI of 5) Source Active A-D route.
GTM IPv4 multicast over an BIERv6 core may be considered an GTM IPv4 multicast over an BIERv6 core may be considered an
alternative to support IPv4 IPTV content delivery during transition alternative to support IPv4 IPTV content delivery during transition
to IPv6 period comparing to [RFC8114]. They both use IPv4-in-IPv6 to IPv6 period comparing to [RFC8114]. They both use IPv4-in-IPv6
encapsulation, while BIERv6 uses an additional BIER header within an encapsulation, while BIERv6 uses an additional BIER header within an
IPv6 Extension header to support stateless core. IPv6 Extension header to support stateless core.
6. Data Plane 6. Data Plane
6.1. Encapsulation of Multicast Traffic 6.1. Encapsulation of Multicast Traffic
BIER IPv6 encapsulation (BIERv6) [I-D.xie-bier-ipv6-encapsulation] is BIER IPv6 encapsulation (BIERv6) [I-D.xie-bier-ipv6-encapsulation] is
used for forwarding the c-multicast traffic through an IPv6 core. used for forwarding the c-multicast traffic through an IPv6 core.
The following diagram shows the progression of an MVPN c-multicast The following diagram shows the progression of an MVPN c-multicast
packet as it enters and leaves the intra-AS service-provider network. packet as it enters and leaves the intra-AS service-provider network.
+---------------+ +---------------+ +---------------+ +---------------+
| P-IPv6 Header | | P-IPv6 Header | | P-IPv6 Header | | P-IPv6 Header |
| ( SA=End.DTx | | ( SA=End.DTx | | (SA=Src.DTx | | (SA=Src.DTx |
| DA=mcBIER ) | | DA=mcBIER ) | | DA=End.BIER) | | DA=End.BIER) |
+---------------+ +---------------+ +---------------+ +---------------+
| P-IPv6 ExtHdr | | P-IPv6 ExtHdr | | P-IPv6 ExtHdr | | P-IPv6 ExtHdr |
| (BIER header) | | (BIER header) | | (BIER header) | | (BIER header) |
++=========++ ++=============++ ++=============++ ++=========++ ++=========++ ++=============++ ++=============++ ++=========++
||C-IP Hdr || || C-IP Hdr || || C-IP Hdr || ||C-IP Hdr || ||C-IP Hdr || || C-IP Hdr || || C-IP Hdr || ||C-IP Hdr ||
++=========++ >> ++=============++ >> ++=============++ >> ++=========++ ++=========++ >> ++=============++ >> ++=============++ >> ++=========++
||C-Payload|| || C-Payload || || C-Payload || ||C-Payload|| ||C-Payload|| || C-Payload || || C-Payload || ||C-Payload||
++=========++ ++=============++ ++=============++ ++=========++ ++=========++ ++=============++ ++=============++ ++=========++
CE1-----------PE1------------------P2------------------PE2-----------CE2 CE1-----------PE1------------------P2------------------PE2-----------CE2
skipping to change at page 8, line 39 skipping to change at page 8, line 36
In case of inter-AS scenario, BIERv6 packets may travel through In case of inter-AS scenario, BIERv6 packets may travel through
unicast to a Boarder Router (BR), and then replicate in a single unicast to a Boarder Router (BR), and then replicate in a single
intra-AS BIERv6 domain. How such non-segmented BIERv6 scenario can intra-AS BIERv6 domain. How such non-segmented BIERv6 scenario can
be supported is outside the scope of this document. be supported is outside the scope of this document.
How segmented MVPN, for example, between BIERv6 and BIERv6, or How segmented MVPN, for example, between BIERv6 and BIERv6, or
between BIERv6 and Ingress Replication(IR) in Non-MPLS IPv6 networks, between BIERv6 and Ingress Replication(IR) in Non-MPLS IPv6 networks,
is outside the scope of this document. is outside the scope of this document.
The Src.DTx SHOULD support as destination address of an ICMPv6
packet. The following is an example pseudo-code of the Src.DTx
function as destination address:
1. IF Last_NH = ICMPv6 ;;Ref1
2. Send to CPU.
3. ELSE
4. Drop the packet.
Ref1: ICMPv6 packet using Src.DT4, Src.DT6 or Src.DT46 as destination
address.
6.2. MTU 6.2. MTU
Each BFIR is expected to know the Maximum Transmission Unit (MTU) of Each BFIR is expected to know the Maximum Transmission Unit (MTU) of
the BIER domain. This may be known by provisioning, or by method the BIER domain. This may be known by provisioning, or by method
specified in [draft-ietf-bier-mtud]. The section 3 of [RFC8296] specified in [draft-ietf-bier-mtud]. The section 3 of [RFC8296]
applies. applies.
6.3. TTL 6.3. TTL
The ingress PE (BFIR) should not copy the Time to Live (TTL) field The ingress PE (BFIR) should not copy the Time to Live (TTL) field
from the payload IP header received from a CE router to the delivery from the payload IP header received from a CE router to the delivery
IP header. Setting the TTL of the delivery IP header is determined IP header. Setting the TTL of the delivery IP header is determined
by the local policy of the ingress PE (BFIR) router per section 3 of by the local policy of the ingress PE (BFIR) router per section 3 of
[RFC8296]. [RFC8296].
7. Security Considerations 7. Security Considerations
The procedures of this document do not, in themselves, provide The security considerations SEC-1, SEC-2, SEC-3 defined in
privacy, integrity, or authentication for the control plane or the [I-D.ietf-spring-srv6-network-programming] apply equally to this
data plane. document.
8. IANA Considerations 8. IANA Considerations
No IANA allocation is required. Allocation is expected from IANA for the following Src.DTx functions
codepoints from the "SRv6 Endpoint Behaviors" sub-registry.
Values 68, 69, 70 is suggested for Src.DT6, Src.DT4, Src.DT46
respectively.
+-------+--------+--------------------------+------------+
| Value | Hex | Endpoint function | Reference |
+-------+--------+--------------------------+------------+
| TBD | TBD | Src.DT6 | This draft |
+-------+--------+--------------------------+------------+
| TBD | TBD | Src.DT4 | This draft |
+-------+--------+--------------------------+------------+
| TBD | TBD | Src.DT46 | This draft |
+-------+--------+--------------------------+------------+
Src.DT6 Source address indicating decapsulation and IPv6 table lookup
e.g. IPv6-MVPN (equivalent to per-VRF VPN label in RFC8556)
Src.DT4 Source address indicating decapsulation and IPv4 table lookup
e.g. IPv4-MVPN (equivalent to per-VRF VPN label in RFC8556)
Src.DT46 Source address indicating decapsulation and IP table lookup
e.g. IP-MVPN (equivalent to per-VRF VPN label)
9. Acknowledgements 9. Acknowledgements
TBD. TBD.
10. References 10. References
10.1. Normative References 10.1. Normative References
[I-D.dawra-idr-srv6-vpn] [I-D.dawra-bess-srv6-services]
Dawra, G., Filsfils, C., Dukes, D., Brissette, P., Dawra, G., Filsfils, C., Dukes, D., Brissette, P.,
Camarillo, P., Leddy, J., daniel.voyer@bell.ca, d., Sethuram, S., Camarillo, P., Leddy, J.,
daniel.bernier@bell.ca, d., Steinberg, D., Raszuk, R., daniel.voyer@bell.ca, d., daniel.bernier@bell.ca, d.,
Decraene, B., Matsushima, S., and S. Zhuang, "BGP Steinberg, D., Raszuk, R., Decraene, B., Matsushima, S.,
Signaling for SRv6 based Services.", draft-dawra-idr- and S. Zhuang, "SRv6 BGP based Overlay services", draft-
srv6-vpn-05 (work in progress), October 2018. dawra-bess-srv6-services-00 (work in progress), March
2019.
[I-D.filsfils-spring-srv6-network-programming] [I-D.ietf-spring-srv6-network-programming]
Filsfils, C., Camarillo, P., Leddy, J., Filsfils, C., Camarillo, P., Leddy, J.,
daniel.voyer@bell.ca, d., Matsushima, S., and Z. Li, "SRv6 daniel.voyer@bell.ca, d., Matsushima, S., and Z. Li, "SRv6
Network Programming", draft-filsfils-spring-srv6-network- Network Programming", draft-ietf-spring-srv6-network-
programming-07 (work in progress), February 2019. programming-00 (work in progress), April 2019.
[I-D.ietf-bier-mvpn]
Rosen, E., Sivakumar, M., Aldrin, S., Dolganow, A., and T.
Przygienda, "Multicast VPN Using BIER", draft-ietf-bier-
mvpn-11 (work in progress), March 2018.
[I-D.ietf-spring-segment-routing]
Filsfils, C., Previdi, S., Ginsberg, L., Decraene, B.,
Litkowski, S., and R. Shakir, "Segment Routing
Architecture", draft-ietf-spring-segment-routing-15 (work
in progress), January 2018.
[I-D.xie-bier-ipv6-encapsulation] [I-D.xie-bier-ipv6-encapsulation]
Xie, J., Geng, L., McBride, M., Dhanaraj, S., Yan, G., and Xie, J., Geng, L., McBride, M., Dhanaraj, S., Yan, G., and
Y. Xia, "Encapsulation for BIER in Non-MPLS IPv6 Y. Xia, "Encapsulation for BIER in Non-MPLS IPv6
Networks", draft-xie-bier-ipv6-encapsulation-00 (work in Networks", draft-xie-bier-ipv6-encapsulation-01 (work in
progress), March 2019. progress), June 2019.
[RFC5549] Le Faucheur, F. and E. Rosen, "Advertising IPv4 Network
Layer Reachability Information with an IPv6 Next Hop",
RFC 5549, DOI 10.17487/RFC5549, May 2009,
<https://www.rfc-editor.org/info/rfc5549>.
[RFC6515] Aggarwal, R. and E. Rosen, "IPv4 and IPv6 Infrastructure [RFC6515] Aggarwal, R. and E. Rosen, "IPv4 and IPv6 Infrastructure
Addresses in BGP Updates for Multicast VPN", RFC 6515, Addresses in BGP Updates for Multicast VPN", RFC 6515,
DOI 10.17487/RFC6515, February 2012, DOI 10.17487/RFC6515, February 2012,
<https://www.rfc-editor.org/info/rfc6515>. <https://www.rfc-editor.org/info/rfc6515>.
[RFC6625] Rosen, E., Ed., Rekhter, Y., Ed., Hendrickx, W., and R. [RFC6625] Rosen, E., Ed., Rekhter, Y., Ed., Hendrickx, W., and R.
Qiu, "Wildcards in Multicast VPN Auto-Discovery Routes", Qiu, "Wildcards in Multicast VPN Auto-Discovery Routes",
RFC 6625, DOI 10.17487/RFC6625, May 2012, RFC 6625, DOI 10.17487/RFC6625, May 2012,
<https://www.rfc-editor.org/info/rfc6625>. <https://www.rfc-editor.org/info/rfc6625>.
skipping to change at page 10, line 38 skipping to change at page 11, line 17
Explicit Replication (BIER)", RFC 8279, Explicit Replication (BIER)", RFC 8279,
DOI 10.17487/RFC8279, November 2017, DOI 10.17487/RFC8279, November 2017,
<https://www.rfc-editor.org/info/rfc8279>. <https://www.rfc-editor.org/info/rfc8279>.
[RFC8296] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A., [RFC8296] Wijnands, IJ., Ed., Rosen, E., Ed., Dolganow, A.,
Tantsura, J., Aldrin, S., and I. Meilik, "Encapsulation Tantsura, J., Aldrin, S., and I. Meilik, "Encapsulation
for Bit Index Explicit Replication (BIER) in MPLS and Non- for Bit Index Explicit Replication (BIER) in MPLS and Non-
MPLS Networks", RFC 8296, DOI 10.17487/RFC8296, January MPLS Networks", RFC 8296, DOI 10.17487/RFC8296, January
2018, <https://www.rfc-editor.org/info/rfc8296>. 2018, <https://www.rfc-editor.org/info/rfc8296>.
[RFC8556] Rosen, E., Ed., Sivakumar, M., Przygienda, T., Aldrin, S.,
and A. Dolganow, "Multicast VPN Using Bit Index Explicit
Replication (BIER)", RFC 8556, DOI 10.17487/RFC8556, April
2019, <https://www.rfc-editor.org/info/rfc8556>.
10.2. Informative References 10.2. Informative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
Authors' Addresses Authors' Addresses
Jingrong Xie Jingrong Xie
Huawei Technologies Huawei Technologies
Email: xiejingrong@huawei.com Email: xiejingrong@huawei.com
Mike McBride Mike McBride
Huawei Technologies Futurewei
Email: michael.mcbride@huawei.com Email: mmcbride7@gmail.com
Senthil Dhanaraj Senthil Dhanaraj
Huawei Technologies Huawei Technologies
Email: senthil.dhanaraj@huawei.com Email: senthil.dhanaraj@huawei.com
Liang Geng Liang Geng
China Mobile China Mobile
Email: gengliang@chinamobile.com Email: gengliang@chinamobile.com
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