Explains how SRv6 provides IPv4 global BGP services and describes the endpoint behaviors used to decapsulate and forward IPv4 traffic.
IPv4 BGP global is a BGP service that operates within an IPv4 network, and is supported by SRv6-based services through the implementation of uDX4, uDT4, and uDT46 SRv6 functions at the PE node.
Key concepts
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IPv4 global BGP: Refers to BGP routing specifically for IPv4 addresses within the global routing table, typically used for internet-wide connectivity rather than within a Virtual Routing and Forwarding (VRF) instance.
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uDX4, uDT4, and uDT46 SRv6 Functions: These are specific SRv6 Segment Identifiers (SIDs) or behaviors that define how a packet is processed at an SRv6-enabled node.
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uDX4 (Endpoint with decapsulation and IPv4 lookup): This behavior indicates that the PE node decapsulates the SRv6 header and then performs an IPv4 lookup in its routing table to forward the packet.
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uDT4 (Endpoint with decapsulation and IPv4 table lookup): This behavior is similar to uDX4, specifically indicating a lookup in an IPv4 routing table.
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uDT46 (Endpoint with decapsulation and IPv4/IPv6 table lookup): This behavior supports decapsulation and a lookup in either an IPv4 or IPv6 routing table, enabling dual-stack forwarding.
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