VXLAN EVPN TE - Multi-Site egress load balancing
The VXLAN EVPN TE - Multi-Site egress load balancing feature is a technology in the networking category that
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facilitates traffic steering,
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enables load balancing for data sent between different fabrics across multi-site links, and
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operates across an IP-based underlay network, also known as the Inter-site Network (ISN) to provide IP traffic engineering for overlay-encapsulated traffic over the underlay.
Topology of VXLAN EVPN TE - Multi-Site egress load balancing

The VXLAN EVPN TE - Multi-Site egress load balancing enhances the use of inter-data center links.
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In this topology, three VXLAN EVPN fabrics, that belong to the same Multi-Site domain, connect to the network through a local tier of Border Gateway devices (BGWs) at remote sites.
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Deployment of various BGW types, such as Anycast BGWs, vPC BGWs, and Border Gateway Spine devices is supported.
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Different connectivity options are allowed for interconnection such as
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through direct BGW-to-BGW links, or
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through a generic core infrastructure (ISN).
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Typically, the paths designated in orange serve as the best path or multipath for communication between endpoints at site-1 and site-2.
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Enabling the VXLAN EVPN TE - Multi-Site egress load balancing feature gives access to additional traffic distribution paths beyond the best path such as
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through an intermediary location, referred to as site-3 (highlighted in blue), or
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through a generic core infrastructure (highlighted in green).
The alternative paths are available as part of unequal equal-cost multipath (uECMP) or weighted unequal equal-cost multipath (wuECMP).
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