EVPN gateway support for all-active (A-A) multihoming adds a new redundancy model to our multi-domain EVPN solution introduced in [1]. This deployment model introduces the concept of a WAN Interconnect Ethernet Segment identifier (WAN I-ESI) which is shared by gateway nodes within the same domain (site) and set in MAC-IP routes that cross domain boundaries. The WAN I-ESI allows the gateway’s EVPN neighbors to form L2 and L3 overlay ECMP on routes re-exported by the gateway.

STP EVPN All Active Multihoming EOS 4.29.0F EOS 4.31.0F

Arista MLAG supports STP for Layer 2 loop detection. In fact, most customers enable STP in their MLAG(s) to ensure no

STP EVPN 4.25.1F All Active Multihoming

Spanning Tree Protocol requires each interface to have a unique port number ranging from 1 through 4095.  Arista STP typically assigns port numbers to port-channel interfaces in the order in which they are configured.

STP EVPN All Active Multihoming EOS 4.29.0F