Multicast and Ethernet VPN with Segment Routing P2MP and Ingress Replication

Internet-Draft	BGP MVPN and EVPN with SR P2MP and IR	November 2024
Parekh, Ed., et al.	Expires 10 May 2025	[Page]

Abstract

A Point-to-Multipoint (P2MP) Tree in a Segment Routing domain carries traffic from a Root to a set of Leaves. This document describes extensions to BGP encodings and procedures for P2MP trees and Ingress Replication used in BGP/MPLS IP VPNs and Ethernet VPNs in a Segment Routing domain.¶

3. PMSI Tunnel Attribute for SR P2MP

BGP PMSI Tunnel Attribute (PTA) is defined in [RFC6514] to identify the P-Tunnel that is used to instantiate a Provider Multicast Service Interface (PMSI). The PTA is carried in Intra-AS I-PMSI, Inter-AS I-PMSI, Selective PMSI, and Leaf Auto-Discovery routes.¶

A P2MP tree PTA is constructed as specified below.¶

Tunnel Type: The IANA assigned code point 0x0C for "SR-MPLS P2MP Tree" or code point TBDfor "SRv6 P2MP Tree", from the "P-Multicast Service Interface Tunnel (PMSI Tunnel) Tunnel Types" registry.¶
Flags: See Section 4 for use of "Leaf Info Required bit".¶
MPLS Label: See Section 3.1 ¶
Tunnel Identifier: The SR P2MP P-Tunnel is identified by <Tree-ID, Root> where,¶
- Tree-ID is a 32-bit unsigned value that identifies a unique P2MP tree at a Root.¶
- Root is an IP address identifying the Root of a P2MP tree. This can be either an IPv4 or IPv6 address and can be inferred from the PTA length.¶

When a P-Tunnel is non-segmented, the PTA is created by PE router at the Root of a SR P2MP tree. For segmented P-Tunnels, each segment can be instantiated by a different technology. If a segment is instantiated using P2MP tree, the router at the root of a P2MP tree creates the PTA.¶

3.1. MPLS Label

[RFC6514] allows a PE to aggregate two or more MVPNs onto one P-Tunnel by advertising the same P-Tunnel in PTA of Auto-Discovery routes of different MVPNs. This section specifies how the "MPLS Label" field of PTA is filled to provide a context bound to a specific MVPN. For EVPN considerations, see SR P2MP Trees for EVPN section.¶

3.1.1. SR-MPLS

When a SR P2MP P-Tunnel is shared across two or more MVPNs in a SR MPLS domain [RFC8660], the "MPLS Label" field of a PTA advertised in an Auto-Discovery route MUST contain an upstream-assigned MPLS label that the advertising PE has bound to the MVPN, or a label assigned from a global context such as "Domain- wide Common Block" (DCB) as specified in [RFC9573].¶

When a customer payload is steered into a shared SR P2MP P-Tunnel, this MPLS label MUST be imposed before the MPLS label representing the Tree-SID.¶

3.1.2. SRv6

When a SR P2MP P-Tunnel is shared across two or more MVPNs in a SRv6 domain [RFC8986], the "MPLS Label" field of a PTA advertised in an Auto-Discovery route MUST contain an upstream-assigned SRv6 Multicast Service SID Section 5.2.1 that the advertising PE has bound to the MVPN, or a SRv6 Multicast Service SID assigned from a global context; this follows same concept of "Domain- wide Common Block" (DCB) label as specified in [RFC9573]. The high order 20 bits of this field carry the whole or a portion of the Function part of the SRv6 Multicast Service SID when Transposition Scheme of encoding as defined in [RFC9252] is used. When using the Transposition Scheme, the Transposition Length of SRv6 SID Structure Sub-Sub-TLV of SRv6 Prefix-SID attribute (see below) MUST be less than or equal to 20 and less than or equal to the Function Length. When Transposition scheme is not used, the label field MUST be set to zero and Transposition Length MUST be zero.¶

The advertising ingress PE attaches a BGP Prefix-SID attribute [RFC8669] to Intra-AS I-PMSI, Inter-AS I-PMSI or S-PMSI A-D routes with SRv6 L3 Service TLV [RFC9252] to signal SRv6 Multicast Service SID. The SRv6 SID Information Sub-TLV carries the SRv6 Multicast Service SID in SRv6 SID Value field. The SRv6 Endpoint Behavior of the SRv6 SID Information Sub-TLV encodes one of End.DTMC4, End.DTMC6 or End.DTMC46 code point values. The SRv6 SID Structure Sub-Sub-TLV encodes the structure of SRv6 Multicast Service SID. If Transposition scheme is used, the offset and length of SRv6 Multicast Endpoint function of SRv6 Multicast Service SID is set in Transposition Length and Transposition Offset fields of this sub-sub TLV. Otherwise, the Transposition Length and Offset fields MUST be set to zero. The locator (LOC) of SRv6 Multicast Service SID is the LOC of the advertising ingress PE. The ingress PE MAY user a non-routable prefix as LOC of the SRv6 Multicast Service SID to prevent packets being routed to it based on the SID. The LOC of an SRv6 Multicast Service SID which is assigned from a global context, such as DCB, is outside the scope of this document.¶

The ingress PE MUST encapsulate customer payload, steered into a shared SR P2MP P-Tunnel, in an outer IPv6 header with SRH in which the SRv6 Multicast Service SID MUST be the last segment in the segment list (note the SRv6 Multicast Service SID may be the only segment in SRH) . If Transposition scheme is used, ingress PE MUST merge Function in MPLS Label field of PTA with SRv6 SID in SID Information TLV using the Transposition Offset and Length fields from SID structure sub-sub TLV to create SRv6 Multicast Service SID¶

The Egress PEs of a shared SR P2MP P-Tunnel use the SRv6 Multicast Service SID in SRH to determine the MVPN in which the customer payload is to be delivered. An egress PE, in role of Leaf or Bud Node of Replication Segment associated with shared SR-P2MP P-Tunnel tree, uses "look at next SID in SRH" [RFC9524] behavior to process the SRv6 Multicast Service SID. An egress PE MUST NOT install the SRv6 Multicast Service SID in it's Forwarding Information Base (FIB) i.e. it MUST NOT forward packets based on the Locator portion of the SRv6 Multicast Service SID.¶

4. MVPN Auto-Discovery and Binding Procedures for P2MP Trees

[RFC6514] defines procedures for discovering PEs participating in a given MVPN and binding customer multicast flows to specific P-Tunnels. This section specifies modifications to these procedures for SR P2MP tree P-Tunnels. In this section, the term "SR P2MP" refers to both SR-MPLS and SRv6.¶

4.1. Intra-AS I-PMSI

Intra-AS I-PMSI A-D routes are exchanged to discover PEs participating in a MVPN within an AS, or across different ASes when non-segmented P-Tunnels are used for inter-AS MVPNs.¶

4.1.1. Originating Intra-AS I-PMSI routes

RFC 6514 Section 9.1.1 describes procedures for originating Intra-AS I-PMSI A-D routes. For SR P2MP P-Tunnels, these procedures remain unchanged except as described in the following paragraphs.¶

When a PE originates an Intra-AS I-PMSI A-D route with a PTA having SR P2MP P-Tunnel Type, it MUST create a Candidate Path of SR P2MP policy on the PCE. When the PCE instantiates an instance of the P2MP tree on the PE, the Tree-SID MUST be imposed for customer flow(s) steered into the P2MP tree. The Leaf nodes of P2MP tree are discovered using procedures described in Section 4.1.2.¶

For a PE in "Receiver Sites set", condition (c) is modified to include P2MP tree; such a PE MUST originate an Intra-AS I-PMSI A-D route when some PEs of the MVPN have VRFs that use SR P2MP tree but MUST NOT create a SR P2MP policy as described above.¶

When a PE withdraws an Intra-AS I-PMSI A-D route, advertised with a PTA having SR P2MP P-Tunnel Type, the Tree-SID imposition state at the PE MUST be removed.¶

A PE MAY aggregate two or more Intra-AS I-PMSIs from different MVPNs onto the same SR P2MP P-Tunnel. When a PE withdraws the last Intra-AS I-PMSI A-D route, advertised with a PTA identifying a SR P2MP P-Tunnel , it SHOULD remove the Candidate Path of SR P2MP policy on the PCE.¶

4.1.2. Receiving Intra-AS I-PMSI A-D routes

Procedure for receiving Intra-AS I-PMSI A-D routes, as described in RFC 6514 Section 9.1.2, remain unchanged for SR P2MP P-Tunnels except as described in the following paragraphs.¶

When a PE that advertises a SR P2MP P-Tunnel in the PTA of its Intra-AS I-PMSI A-D route, imports an Intra-AS I-PMSI A-D route from some PE, it MUST add that PE as a Leaf node to the SR P2MP Policy on the PCE. The Originating IP Address of the Intra-AS i-PMSI A-D route is used as the Leaf Address. This procedure MUST also be followed for all Intra-AS I-PMSI routes that are already imported when the PE advertises a SR P2MP P-Tunnel in PTA of its Intra-AS I-PMSI A-D route.¶

A PE that imports and processes an Intra-AS I-PMSI A-D route from another PE with PTA having SR P2MP P-Tunnel MUST program the Tree-SID of the P2MP tree identified in the PTA of the route for disposition. Note that an Intra-AS I-PMSI A-D route from another PE can be imported before the P2MP tree identified in the PTA of the route is instantiated by the PCE at the importing PE. In such case, the PE MUST correctly program Tree-SID for disposition. A PE in "Sender Sites set" MAY avoid programming the Tree-SID for disposition.¶

When an Intra-AS I-PMSI A-D route, advertised with a PTA having SR P2MP P-Tunnel Type is withdrawn, a PE MUST remove the disposition state of the Tree-SID associated with P2MP tree.¶

A PE MAY aggregate two or more Intra-AS I-PMSIs from different MVPNs onto the same SR P2MP P-Tunnel. When a remote PE withdraws an Intra-AS I-PMSI A-D route from a MVPN, and if this is the last MVPN sharing a SR P2MP P-Tunnel, a PE must remove the originating PE as a Leaf from the SR P2MP Policy on the PCE.¶

4.2. Using S-PMSIs for binding customer flows to P2MP Segments

[RFC6514] specifies procedures for binding (C-S,C-G) customer flows to P-Tunnels using S-PMSI A-D routes. Wildcards in Multicast VPN Auto-Discovery Routes [RFC6625] specifies additional procedures to binding aggregate customer flows to P-Tunnels using "wildcard" S-PMSI A-D routes. This section describes modification to these procedures for SR P2MP P-Tunnels.¶

4.2.1. Originating S-PMSI A-D routes

RFC 6514 Section 12.1 describes procedures for originating S-PMSI A-D routes. For SR P2MP P-Tunnels, these procedures remain unchanged except as described in the following paragraphs.¶

When a PE originates S-PMSI A-D route with a PTA having SR P2MP P-Tunnel Type, it MUST set the "Leaf Info Required bit" in the PTA. The PE MUST create a Candidate Path of SR P2MP Policy on the PCE. When the PCE instantiates an instance of P2MP tree on the PE, the Tree-SID MUST be imposed for customer flows steered into the SR P2MP P-Tunnel.¶

The Leaf nodes of P2MP tree are discovered by Leaf A-D routes using procedures described in Section 4.4.2. When a PE originates S-PMSI A-D route with a PTA having SR P2MP P-Tunnel Type, it is possible the PE might have imported Leaf A-D routes whose route keys match the S-PMSI A-D route. The PE MUST re-apply procedures of Section 4.4.2 to these Leaf A-D routes.¶

When a PE withdraws a S-PMSI A-D route, advertised with PTA having P2MP tree P-Tunnel type, the Tree-SID imposition state MUST be removed.¶

A PE MAY aggregate two or more S-PMSIs onto the same SR P2MP P-Tunnel. When a PE withdraws the last S-PMSI A-D route, advertised with a PTA identifying a specific SR P2MP P-Tunnel , it SHOULD remove the SR P2MP Policy on the PCE.¶

4.2.2. Receiving S-PMSI A-D routes

RFC 6514 Section 12.3 describes procedures for receiving S-PMSI A-D routes. For SR P2MP P-Tunnels, these procedures remain unchanged except as described in the following paragraphs.¶

The procedure to join SR P2MP P-Tunnel of S-PMSI A-D route by using a Leaf A-D route is described in Section 4.4.1. If P2MP tree identified in PTA of S-PMSI A-D route is already instantiated by PCE, the PE MUST program Tree-SID for disposition. If the P2MP tree is instantiated later, the Tree-SID MUST be programmed for disposition at that time.¶

When a S-PMSI A-D route, whose SR P2MP P-Tunnel has been joined by a PE, is withdrawn, or when conditions (see RFC 6514 Section 12.3) required to join that P-Tunnel are no longer satisfied, the PE MUST leave the P-Tunnel. The PE MUST withdraw the Leaf A-D route it had originated and remove the Tree-SID disposition state.¶

4.3. Inter-AS P-tunnels using P2MP Segments

A segmented inter-AS P-Tunnel consists of one or more intra-AS segments, one in each AS, connected by inter-AS segments between ASBRs of different ASes https://tools.ietf.org/html/rfc6514#section-9.2. These segments are constructed by PEs/ASBRs originating or re-advertising Inter-AS I-PMSI A-D routes. This section describes procedures for instantiating intra-AS segments using SR P2MP trees.¶

4.3.1. Advertising Inter-AS I-PMSI routes into iBGP

RFC 6514 Section 9.2.3.2 specifies procedures for advertising an Inter-AS I-PMSI A-D route to construct an intra-AS segment. The PTA of the route identifies the type and identifier of the P-Tunnel instantiating the intra-AS segment. The procedure for creating SR P2MP P-Tunnel for intra-AS segment are same as specified in Section 4.2.1 except that instead of S-PMSI A-D routes, the procedures apply to Inter-AS I-PMSI A-D routes.¶

4.3.2. Receiving Inter-AS I-PMSI A-D routes in iBGP

RFC 6514 Section 9.2.3.2 specifies procedures for processing an Inter-AS I-PMSI A-D route received via iBGP. If the PTA of the Inter-AS I-PMSI A-D route has SR P2MP P-Tunnel Type, the procedures are same as specified in Section 4.2.2 except that instead of S-PMSI A-D routes, the procedures apply to Inter-AS I-PMSI A-D routes. If the receiving router is an ASBR, the Tree-SID is stitched to the inter-AS segments to ASBRs in other ASes.¶

4.4. Leaf A-D routes for P2MP Segment Leaf Discovery

This section describes procedures for originating and processing Leaf A-D routes used for Leaf discovery of SR P2MP trees.¶

4.4.1. Originating Leaf A-D routes

The procedures for originating Leaf A-D route in response to receiving a S-PMSI or Inter-AS I-PMSI A-D route with PTA having SR P2MP P-Tunnel Type are same as specified in RFC 6514 Section 9.2.3.4.1.¶

4.4.2. Receiving Leaf A-D routes

Procedures for processing a received Leaf A-D route are specified in RFC 6514 Section 9.2.3.5. These procedures remain unchanged for discovering Leaf nodes of SR P2MP Policy except for considerations described in following paragraphs. These procedures apply to Leaf A-D routes received in response to both S-PMSI and Inter-AS I-PMSI A-D routes, shortened to "A-D routes" in this section¶

A Root PE/ASBR MAY use the same SR P2MP P-Tunnel in PTA of two or more A-D routes. For such aggregated P2MP trees, the PE/ASBR may receive multiple Leaf A-D routes from a Leaf PE. The P2MP tree for which a Leaf A-D is received can be identified by examining the P2MP tunnel Identifier in the PTA of A-D route that matches "Route Key" field of the Leaf A-D route. When the PE receives the first Leaf A-D route from a Leaf PE, identified by the Originating Router's IP address field, it MUST add that PE as Leaf of the SR P2MP Policy on the PCE.¶

When a Leaf PE withdraws the last Leaf A-D route for a given SR P2MP P-Tunnel, the Root PE MUST remove the Leaf PE from the SR P2MP Policy on PCE. Note that Root PE MAY remove the SR P2MP Policy on the PCE, before the last Leaf A-D is withdrawn. In this case, the Root PE MAY not need to remove the Leaf from SR P2MP Policy..¶

5. MVPN with Ingress Replication over Segment Routing

A PE can provide MVPN service using Ingress Replication over Segment Routing. Customer payload is encapsulated in SR-MPLS or IPv6 (SRv6) at Ingress PE. The encapsulated payload is replicated and a unicast copy is sent to each egress PE.¶

Ingress Replication Tunnels in Multicast VPN [RFC7988] specifies procedures that can be used to provide MVPN service with Ingress Replication in a Segment Routing domain. A PE advertises Intra-AS, Inter-AS, Selective PMSI BGP Auto-Discovery routes with PTA for Ingress Replication. Egress PEs join asLeaf Nodes using Intrra-AS I-PMSI or Leaf Auto-Discovery routes.¶

RFC 7988 procedures allow an ingress PE to deliver MVPN traffic to egress PEs using best-effort unicast connectivity. For MVPN service with an underlay SLA from ingress PE to an egress PE, the egress PE colors the Leaf Auto-Discovery route with a Color Extended Community as specified in [I-D.ietf-idr-sr-policy-safi]. The ingress PE replicates MVPN customer payload to that egress PE by steering traffic into a SR-TE policy (Color, egress PE) according to section 8 of [RFC9256].¶

5.1. SR-MPLS

Procedures of RFC 7988 are sufficient to create a SR-MPLS Ingress Replication for MVPN service.¶

If an egress PE colors the Leaf A-D route with Color Extended Community, the ingress PE encapsulates the payload packet into segment list of (Color, egress PE) SR-TE policy along with IR label received from the egress PE. Suppose the egress PE, say PE2, sends Leaf A-D route with extended color community C1 and IR label L10. Assume the segment list of SR-TE policy (C1, PE2) at ingress PE1 is <L1, L2, L3>, PE1 will encapsulate MVPN customer payload into MPLS label stack <L1, L2, L3, L10> with L10 as BoS label.¶

5.2. SRv6

Procedures of RFC 7988, along with modifications described in this Section, are sufficient to create a SRv6 Ingress Replication for MVPN service.¶

The PTA carried in Intra-AS, Inter-AS, Selective PMSI and Leaf Auto-Discovery routes is constructed as specified in RFC 7988 with modifications as below:¶

Tunnel Type: "Ingress Replication" as per [RFC6514].¶
MPLS Label: The high order 20 bits of this field carry the whole or a portion of the Function part of the SRv6 Multicast Service SID when ingress replication is used with the Transposition Scheme of encoding as defined in [RFC9252]. When using the Transposition Scheme, the Transposition Length of SRv6 SID Structure Sub-Sub-TLV of SRv6 Prefix-SID attribute (see below) MUST be less than or equal to 20 and less than or equal to the Function Length. When Transposition scheme is not used, the label field MUST be set to zero and Transposition Length MUST be zero.¶

Section 6 and 7 of RFC 7988 describe considerations and procedures for allocating MPLS labels for IR P-Tunnel. For SRv6 Ingress Replication, these sections apply to SRv6 Multicast Service SID.¶

To join a SRv6 Ingres Replication P-Tunnel advertised in PTA of Inra-AS, Inter-AS, or Selective S-PMSI A-D routes, an egress PE constructs a Leaf A-D or Intra-AS I-PMSI route as described in RFC 7988 with modified PTA above. The egress PE attaches a BGP Prefix-SID attribute [RFC8669] in Leaf A-D or Intra-AS I-PMSI route with SRv6 L3 Service TLV [RFC9252] to signal SRv6 Multicast Service SID . The SRv6 SID Information Sub-TLV carries the SRv6 Multicast Service SID in SRv6 SID Value field. The SRv6 Endpoint Behavior of the SRv6 SID Information Sub-TLV encodes one of End.DTMC4, End.DTMC6 or End.DTMC46 code point value. The SRv6 SID Structure Sub-Sub-TLV encodes the structure of SRv6 Multicast Service SID. If Transposition scheme is used, the offset and length of SRv6 Multicast Endpoint function of SRv6 Multicast Service SID is set in Transposition Length and Transposition Offset fields of this sub-sub TLV. Otherwise, the Transposition Length and Offset fields MUST be set to zero. The BGP Prefix SID attribute with SRv6 L3 Service TLV in Intra-AS I-PMSI or Leaf A-D route indicates to ingress PE that egress PE supports SRv6.¶

The SRv6 Multicast Service SID SHOULD be routable within the AS of the egress PE. As per RFC 7988, the Ingress PE uses the Tunnel Identifier of PTA to determine the unicast tunnel to use in order to send data to the egress PE. This document requires the ingress PE to use the SRv6 Multicast Service SID to determine the unicast tunnel to be used. For best-effort MVPN service or SLA based MVPN service using IGP Flexible Algorithm, the ingress PE MUST encapsulate payload in an outer IPv6 header with the SRv6 Multicast Service SID provided by the egress PE as the destination address. If Transposition scheme is used, ingress PE MUST merge Function in MPLS Label field of PTA with SRv6 SID in SID Information TLV using the Transposition Offset and Length fields from SID structure sub-sub TLV to create SRv6 Multicast Service SID¶

If an egress PE colors a Leaf A-D route with Color Extended Community, the ingress PE SHOULD encapsulate the payload packet into outer IPv6 header with segment list of (Color, egress PE) SR-TE policy along with SRv6 Multicast Service SID received with Leaf A-D route from the egress PE using SRH. Suppose the egress PE, say PE2, sends Leaf A-D route with extended color community C1 and SRv6 Multicast Service SID S10. Assume the segment list of SR-TE policy (C1, PE2) at ingress PE1 is <S1, S2, S3>, PE1 will encapsulate MVPN customer payload into IPv6 header with SRH (PE1, S1) (S10, S3, S2; SL=3) (payload). If SRv6 SID compression is used, the ingress PE SHOULD use Compressed SID (C-SID) containers for the policy segments.¶

Table 1: IETF - SRv6 Endpoint Behaviors
Value	Hex	Endpoint behavior	Reference
76	0x004C	End.DTMC4	[This.ID]
77	0x004D	End.DTMC6	[This.ID]
78	0x004E	End.DTMC46	[This.ID]

[I-D.ietf-pim-sr-p2mp-policy]: Voyer, D., Filsfils, C., (editor), R. P., Bidgoli, H., Zhang, Z., and M. Mishra, "Segment Routing Point-to-Multipoint Policy", Work in Progress, Internet-Draft, draft-ietf-pim-sr-p2mp-policy-10, 5 November 2024, <https://datatracker.ietf.org/api/v1/doc/document/draft-ietf-pim-sr-p2mp-policy/>.
[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>.
[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>.
[RFC7385]: Andersson, L. and G. Swallow, "IANA Registry for P-Multicast Service Interface (PMSI) Tunnel Type Code Points", RFC 7385, DOI 10.17487/RFC7385, October 2014, <https://www.rfc-editor.org/info/rfc7385>.
[RFC7988]: Rosen, E., Ed., Subramanian, K., and Z. Zhang, "Ingress Replication Tunnels in Multicast VPN", RFC 7988, DOI 10.17487/RFC7988, October 2016, <https://www.rfc-editor.org/info/rfc7988>.
[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>.
[RFC8660]: Bashandy, A., Ed., Filsfils, C., Ed., Previdi, S., Decraene, B., Litkowski, S., and R. Shakir, "Segment Routing with the MPLS Data Plane", RFC 8660, DOI 10.17487/RFC8660, December 2019, <https://www.rfc-editor.org/info/rfc8660>.
[RFC8669]: Previdi, S., Filsfils, C., Lindem, A., Ed., Sreekantiah, A., and H. Gredler, "Segment Routing Prefix Segment Identifier Extensions for BGP", RFC 8669, DOI 10.17487/RFC8669, December 2019, <https://www.rfc-editor.org/info/rfc8669>.
[RFC8754]: Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J., Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header (SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020, <https://www.rfc-editor.org/info/rfc8754>.
[RFC8986]: Filsfils, C., Ed., Camarillo, P., Ed., Leddy, J., Voyer, D., Matsushima, S., and Z. Li, "Segment Routing over IPv6 (SRv6) Network Programming", RFC 8986, DOI 10.17487/RFC8986, February 2021, <https://www.rfc-editor.org/info/rfc8986>.
[RFC9252]: Dawra, G., Ed., Talaulikar, K., Ed., Raszuk, R., Decraene, B., Zhuang, S., and J. Rabadan, "BGP Overlay Services Based on Segment Routing over IPv6 (SRv6)", RFC 9252, DOI 10.17487/RFC9252, July 2022, <https://www.rfc-editor.org/info/rfc9252>.
[RFC9524]: Voyer, D., Ed., Filsfils, C., Parekh, R., Bidgoli, H., and Z. Zhang, "Segment Routing Replication for Multipoint Service Delivery", RFC 9524, DOI 10.17487/RFC9524, February 2024, <https://www.rfc-editor.org/info/rfc9524>.

12.2. Informative References

[I-D.ietf-bess-evpn-mvpn-seamless-interop]: Sajassi, A., Thiruvenkatasamy, K., Thoria, S., Gupta, A., and L. Jalil, "Seamless Multicast Interoperability between EVPN and MVPN PEs", Work in Progress, Internet-Draft, draft-ietf-bess-evpn-mvpn-seamless-interop-07, 24 June 2024, <https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-mvpn-seamless-interop-07>.
[I-D.ietf-idr-sr-policy-safi]: Previdi, S., Filsfils, C., Talaulikar, K., Mattes, P., and D. Jain, "Advertising Segment Routing Policies in BGP", Work in Progress, Internet-Draft, draft-ietf-idr-sr-policy-safi-09, 3 October 2024, <https://datatracker.ietf.org/doc/html/draft-ietf-idr-sr-policy-safi-09>.
[RFC6625]: Rosen, E., Ed., Rekhter, Y., Ed., Hendrickx, W., and R. Qiu, "Wildcards in Multicast VPN Auto-Discovery Routes", RFC 6625, DOI 10.17487/RFC6625, May 2012, <https://www.rfc-editor.org/info/rfc6625>.
[RFC7432]: Sajassi, A., Ed., Aggarwal, R., Bitar, N., Isaac, A., Uttaro, J., Drake, J., and W. Henderickx, "BGP MPLS-Based Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432, February 2015, <https://www.rfc-editor.org/info/rfc7432>.
[RFC7899]: Morin, T., Ed., Litkowski, S., Patel, K., Zhang, Z., Kebler, R., and J. Haas, "Multicast VPN State Damping", RFC 7899, DOI 10.17487/RFC7899, June 2016, <https://www.rfc-editor.org/info/rfc7899>.
[RFC8293]: Ghanwani, A., Dunbar, L., McBride, M., Bannai, V., and R. Krishnan, "A Framework for Multicast in Network Virtualization over Layer 3", RFC 8293, DOI 10.17487/RFC8293, January 2018, <https://www.rfc-editor.org/info/rfc8293>.
[RFC9256]: Filsfils, C., Talaulikar, K., Ed., Voyer, D., Bogdanov, A., and P. Mattes, "Segment Routing Policy Architecture", RFC 9256, DOI 10.17487/RFC9256, July 2022, <https://www.rfc-editor.org/info/rfc9256>.
[RFC9572]: Zhang, Z., Lin, W., Rabadan, J., Patel, K., and A. Sajassi, "Updates to EVPN Broadcast, Unknown Unicast, or Multicast (BUM) Procedures", RFC 9572, DOI 10.17487/RFC9572, May 2024, <https://www.rfc-editor.org/info/rfc9572>.
[RFC9573]: Zhang, Z., Rosen, E., Lin, W., Li, Z., and IJ. Wijnands, "MVPN/EVPN Tunnel Aggregation with Common Labels", RFC 9573, DOI 10.17487/RFC9573, May 2024, <https://www.rfc-editor.org/info/rfc9573>.
[RFC9625]: Lin, W., Zhang, Z., Drake, J., Rosen, E., Ed., Rabadan, J., and A. Sajassi, "EVPN Optimized Inter-Subnet Multicast (OISM) Forwarding", RFC 9625, DOI 10.17487/RFC9625, August 2024, <https://www.rfc-editor.org/info/rfc9625>.