IPv6 Route Advertising Over IPv4 BGP Next Hop

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Solution Overview

Problem

Current BGP protocols require separate BGP peering connections for IPv4 and IPv6 addresses, leading to increased resource consumption, memory issues, and high costs due to the need for IPv6 interfaces and infrastructure, which service providers are reluctant to migrate from due to capital expenditure concerns.

Innovation Solution

Advertise IPv6 NLRI with an IPv4 next hop using a new IPv4 extended next hop encoding capability, allowing a single IPv4 session to handle both IPv4 and IPv6 NLRI, eliminating the need for IPv6 peering and infrastructure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate BGP peering connections are used for IPv4 and IPv6 addresses, then routing information can be exchanged for both protocols, but resource consumption increases and memory issues occur

Engineering Contradiction:

Improverouting information exchangeVSAvoidresource consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent merges IPv4 and IPv6 BGP peering into a single unified BGP session. The network device establishes one BGP peering connection that can exchange both IPv4 NLRI and IPv6 NLRI, eliminating the need for separate peering connections. This is achieved by implementing a unified BGP routing information base that stores and processes both IPv4 and IPv6 routing information within the same BGP session context, thereby reducing resource consumption while maintaining reliable routing information exchange for both protocols.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the BGP peering connection universal by enabling it to handle multiple address families (both IPv4 and IPv6) simultaneously. The BGP session is designed to exchange routing information for different protocol types through a single connection, making the peering mechanism multi-functional. This universal BGP peering structure allows the same connection to serve dual purposes of exchanging both IPv4 and IPv6 NLRI, reducing the quantity of peering connections needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If IPv6 interfaces and infrastructure are deployed, then IPv6 NLRI can be advertised, but capital expenditure increases

Engineering Contradiction:

ImproveIPv6 NLRI advertising capabilityVSAvoidcapital expenditure

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent uses IPv4 infrastructure as a template or copy to support IPv6 NLRI advertising without requiring physical IPv6 infrastructure. The unified BGP session replicates the functionality of separate IPv6 peering by processing IPv6 NLRI through the existing IPv4 BGP session framework. This allows service providers to advertise IPv6 routing information using their existing IPv4 infrastructure, avoiding the capital expenditure associated with deploying dedicated IPv6 interfaces and hardware.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent makes the existing IPv4 BGP infrastructure universal by enabling it to handle both IPv4 and IPv6 NLRI advertising. The unified BGP session structure allows the same infrastructure to serve multiple protocol families, making the IPv4-based infrastructure multi-functional. This eliminates the need for separate IPv6 infrastructure deployment while maintaining full IPv6 NLRI advertising capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If dual-stack functionality is maintained with separate IPv4 and IPv6 peering, then both protocols are supported, but device complexity increases

Engineering Contradiction:

Improvedual-stack functionalityVSAvoidpeering configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the configuration and management of IPv4 and IPv6 BGP peering into a single unified structure. Instead of maintaining separate peering configurations for each protocol, the unified BGP session consolidates both address families into one peering relationship. This reduces device complexity by eliminating redundant configuration elements while preserving dual-stack functionality, as the single session handles both IPv4 and IPv6 NLRI exchange.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal BGP peering mechanism that handles multiple protocol families through a single configuration framework. The unified session structure provides multi-functionality by supporting both IPv4 and IPv6 operations within the same peering context, thereby reducing the overall device complexity compared to maintaining separate dedicated peering configurations for each protocol.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12562985B2Systems and methods for advertising IP version 6 network layer routing information with an IP version 4 next hop address

Publication Date: 2026.02.24 VERIZON PATENT & LICENSING INC

AI summary

In some implementations, a first network device may encode Internet protocol version 4 (IPv4) next hop of Internet protocol version 6 (IPv6) information. The first network device may advertise the IPv6 information to a second network device via an IPv4 border gateway protocol. The first network device may forward an IPv6 packet via an IPv4 interface associated with the first network device based on advertising the IPv6 information.