BGP EVPN Multihoming (Dual Homing) Network Topology

The following illustration shows a BGP EVPN Dual Homing typical network topology where a Customer Edge (CE) switch connects to two Virtual Tunnel End Points (VTEPs) through a Link Aggregation Group (LAG) for redundancy and load balancing.

BGP EVPN Dual Homing Network Topology

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In this BGP EVPN multihoming network topology, the CE-1 device is a Layer 2 switch that is unaware of VXLAN. The key components are:

  • The CE-1 device is multi-homed (dual-homed) to both VTEP-1 and VTEP-2 through the Ethernet Segment ES-1.
  • The ports P1 on both VTEP-1 and VTEP-2 are part of ES-1.
  • CE-2 is single-homed to VTEP-1 through port P2.
  • From the CE perspective, ES-1 operates as a standard LAG, either with or without Link Aggregation Control Protocol (LACP).
  • From the VTEPs perspective, ES-1 functions as both a regular LAG and an ES within the BGP EVPN framework.

The following are the key points on network behavior in this topology:

  • CE-1 sees the connection as a standard LAG and is unaware of any ES configurations.
  • VTEP-1 and VTEP-2 are BGP EVPN peers, peering through the underlay network in either a full mesh setup or a Route Reflector (RR) setup.
  • BGP EVPN Multihoming (Dual Homing) manages the operational states of the LAG ports based on the configured redundancy type and the availability of the VTEPs.
  • The ES redundancy mode can be either all-active or single-active. For more information, refer to Ethernet Segment Redundancy Mode topic.

The following are the key points regarding the configuration of BGP EVPN Multihoming (Dual Homing):

  • Before creating an ES segment, ensure that LAGs are configured for both CE and PE devices.
  • Either static or dynamic LAGs can be used for the ES. RUCKUS recommends using dynamic LAGs to prevent errors.
Parent topic: BGP EVPN