Explains how SRv6 supports IPv4 and IPv6 Layer 3 services through BGP signaling, load balancing, MPLS interworking, route leaking, and Path MTU Discovery.
SRv6 Layer 3 services are a category of advanced IP routing and VPN capabilities that
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utilize SRv6 SIDs to steer traffic within a network
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enable scalable, flexible, and integrated IP routing solutions by encapsulating payloads with an outer IPv6 header addressed to an SRv6 Service SID, and
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facilitate seamless interconnection of Provider Edge (PE) nodes and VPN formation.
These services support IPv4 and IPv6 L3VPNs, BGP signaling, redundancy modes, VRF-to-VRF route leaking, and dual-stack deployment in mixed IPv4 and IPv6 environments.
Key features of SRv6 L3 services include:
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Support for dual-stack L3VPN services (IPv4 and IPv6) enabling flexible deployment in mixed IP environments.
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Use of BGP for signaling SRv6 Service SIDs, supporting iBGP, eBGP, OSPF, and static PE-CE protocols.
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Support for Equal-Cost Multi-Path (ECMP) and Unequal Cost Multipath (UCMP) routing.
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Interworking capabilities between MPLS L3VPN and SRv6 L3VPN services.
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Mechanisms for VRF-to-VRF route leaking within the SRv6 core.
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Path Maximum Transmission Unit (MTU) discovery for SRv6 encapsulated packets to optimize packet forwarding and avoid fragmentation.