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Using IPv6 link-local addressing for the underlay enables point-to-point links to function without requiring globally assigned interface addresses, while still maintaining BGP reachability between directly connected devices. The underlay relies solely on IPv6 link-local peering, while IPv4 loopback addresses are used for VXLAN tunnel endpoints and EVPN next-hop resolution. This auto-assigned, unnumbered IPv6 underlay reduces the risk of human configuration errors and streamlines the underlay configuration process. |
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In this test, we reused the previous symmetric VLAN-based IRB, as the overlay was still IPv4. We sent full-mesh unicast traffic with Keysight IxNetwork and observed no packet loss, confirming the unnumbered IPv6 underlay worked as expected. |
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[[~[~[Figure 17: EVPN Unnumbered Underlay~>~>image:486469475693559809_VXLAN-1.11.png~|~|alt="Figure 17" width="450"~]~]>>attach:486469475693559809_VXLAN-1.11.png||target="_blank"]] |
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|[[< Previous>>doc:OISM selective multicast Ingress Replication with IGMP proxy]]|[[Next ~>>>doc:Symmetric Integrated Routing and Bridging (IRB) VLAN-based Interface]] |
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{{include reference="Main.EANTC Transport & Cloud Networks Interop Test Report 2026.Sidebar Nav"/}} |
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