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Comment: add clarification about ECMP with EVPN

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  • VNI membership exchange between VTEPs using EVPN type-3 (Inclusive multicast Ethernet tag) routes.
  • Exchange of host MAC and IP addresses using EVPN type-2 (MAC/IP advertisement) routes.
  • Support for host/VM mobility (MAC and IP moves) through exchange of the MAC Mobility Extended community.
  • Support for dual-attached hosts via VXLAN active-active mode. MAC synchronization between the peer switches is done using MLAG.
  • Support for ARP/ND suppression, which provides VTEPs with the ability to suppress ARP flooding over VXLAN tunnels.

  • Support for exchange of static (sticky) MAC addresses through EVPN.
  • Support for distributed symmetric routing between different subnets.
  • Support for distributed asymmetric routing between different subnets.
  • Support for centralized routing.
  • Support for prefix-based routing using EVPN type-5 routes (EVPN IP prefix route)
  • Support for layer 3 multi-tenancy.
  • Support for IPv6 tenant routing.
  • Symmetric routing, asymmetric routing and prefix-based routing are supported for both IPv4 and IPv6 hosts and prefixes.
  • ECMP ECMP (equal cost multipath) support for overlay networks on RIOT-capable Broadcom switches (Trident 3, Maverick, Trident 2+) in addition to Mellanox Spectrum-A1 and Tomahawk switches. No configuration is needed, ECMP occurs in the overlay when there are multiple next hops.

EVPN address-family is supported with both eBGP and iBGP peering. If the underlay routing is provisioned using eBGP, the same eBGP session can also be used to carry EVPN routes. For example, in a typical 2-tier Clos network topology where the leaf switches are the VTEPs, if eBGP sessions are in use between the leaf and spine switches for the underlay routing, the same sessions can be used to exchange EVPN routes; the spine switches merely act as "route forwarders" and do not install any forwarding state as they are not VTEPs. When EVPN routes are exchanged over iBGP peering, OSPF can be used as the IGP or the next hops can also be resolved using iBGP. 

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