Basics of EVPN

Basics of EVPN

Ethernet VPN (EVPN) is a standards-based technology that offers virtual multipoint bridged connectivity between different Layer 2 domains over an IP or IP/MPLS backbone network.

It can be termed as next generation VPN.

• EVPN is a multi-tenant BGP-based control plane for layer-2 (bridging) and layer-3 (routing) VPNs.
• It can be used with almost any data-plane encapsulation.
• It can be used EVPN to implement end-to-end bridging, integrated bridging and routing, or routing-only fabrics.
• EVPN supports MAC and IP address mobility.
• The unifying control plane used to device layer-2 and layer-3 VPNs in data center and service provider networks.

There are two EVPN-based DCI deployment models detailed in this document:

• BGP-EVPN-based L2 extension

• BGP-EVPN-based L2 and L3 extension

The BGP-EVPN-based L2 and L3 extension DCI (Data Centre Interconnect) deployment model is designed for interconnecting BGP-EVPN-based (IP fabric) Data centers by extending the control plane between sites. 

Advantage:

• With EVPN, service providers can encounter developing demands for higher speeds, sophisticated QoS and guaranteed SLAs.
• It helps with data center interconnect, cloud and virtualization services.
• It supports High Availability (HA) Technology to avoid the potential failure on connection.

Control Plane:

The control plane is the part of a network that carries signaling traffic and is responsible for routing. Control packets initiate from a router or are destined within a router. 

Functions of the control plane comprise system configuration and management.

-DR