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IPv6-Only PE Design for IPv4-NLRI All SAFI over IPv6-NH

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Gyan Mishra , Mankamana Prasad Mishra , Jeff Tantsura , Sudha Madhavi , Qing Yang , Adam Simpson , Shuanglong Chen
Last updated 2022-02-24
Replaced by draft-mishra-bess-ipv6-only-pe-design-all-safi
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-mishra-bess-ipv6-only-pe-design-all-safi
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


As Enterprises and Service Providers upgrade their brown field or green field MPLS/SR core to an IPv6 transport, Multiprotocol BGP (MP- BGP)now plays an important role in the transition of their Provider (P) core network as well as Provider Edge (PE) Inter-AS peering network from IPv4 to IPv6. Operators must be able to continue to support IPv4 customers when both the Core and Edge networks are IPv6-Only. This document details an important External BGP (eBGP) PE-PE Inter-AS IPv6-Only peering design that leverages the MP-BGP capability exchange by using IPv6 peering as pure transport, allowing both IPv4 Network Layer Reachability Information (NLRI) and IPv6 Network Layer Reachability Information (NLRI)to be carried over the same (Border Gateway Protocol) BGP TCP session for all Address Family Identifiers (AFI) and Subsequent Address Family Identifiers(SAFI). The design change provides the same Dual Stacking functionality that exists today with separate IPv4 and IPv6 BGP sessions as we have today. With this design change from a control plane perspective a single IPv6-Only peer is required for both IPv4 and IPv6 routing updates and from a data plane forwarindg perspective an IPv6 address need only be configured on the PE to PE Inter-AS peering interface for both IPv4 and IPv6 packet forwarding. This document extends the IPv6-Only PE- CE peering architecture defined in [I-D.ietf-bess-ipv6-only-pe-design] to PE-PE inter-as peering architecture where the 4to6 softwire is now extended to Inter-AS L3 VPN options Option-A, Option-AB and Option-C and now applies to all AFI/SAFI ubiquitously. As service providers migrate to Segment Routing architecture SR-MPLS and SRv6, VPN overlay exsits as well, and thus Inter-AS options Option-A, Option-AB and Option-C are still applicable and thus this extension of IPv6-Only peering architecure extension to Inter-AS peering is very relevant to Segment Routing as well.


Gyan Mishra
Mankamana Prasad Mishra
Jeff Tantsura
Sudha Madhavi
Qing Yang
Adam Simpson
Shuanglong Chen

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)