Configuring BD-EVPN Functions

Configuring bridge domain BD-EVPN functions involves configuring an EVPN instance in BD mode, creating a BD and binding an EVPN instance to the BD, configuring an L3VPN instance and binding it to a VBDIF interface, and configuring BGP EVPN peer relationships.

Usage Scenario

This section describes how to configure BD-EVPN functions. An EVPN in non-BD mode can only carry Layer 2 services, whereas a BD-EVPN can carry both Layer 2 and Layer 3 services.

Pre-configuration Tasks

Before configuring a BD-EVPN, complete the following tasks:

Configure an IGP on the backbone network to ensure IP connectivity.
Configure MPLS LDP LSPs or TE tunnels on the backbone network.
Configure Layer 2 connections between CEs and PEs.
(Optional) In a CE dual-homing scenario where Layer 3 traffic is transmitted, configure the function to send ARP packets at a constant speed to limit the rate at which ARP broadcasts request packets. It is recommended that an ARP request packet be broadcast every 10 ms. This ensures a rapid traffic switchover after a CE fault occurs.

Configuring an EVPN Instance in BD Mode: To implement service access based on a BD and manage EVPN routes, configure EVPN instances in BD mode on PEs.

Configuring an EVPN Source Address: An EVPN source address uniquely identifies a PE in EVPN networking.

Configuring an ESI: An ESI must be configured on a PE interface or a BD connected to a CE. The same ESI must be configured for PE interfaces connecting to the same CE.

Configuring a BD and Binding an EVPN Instance to the BD: An EVPN instance in BD mode is only bound to a BD instead of an interface.

Creating an L3VPN Instance and Binding It to a VBDIF Interface: To enable an EVPN to transmit Layer 3 services, configure an L3VPN instance and bind it to a VBDIF interface.

Configuring an EVPN BGP Peer Relationship: After two PEs establish a BGP EVPN peer relationship, they can exchange EVPN routes.

(Optional) Configuring the Global Redundancy Mode: A PE's global redundancy mode determines whether the PE can work with other PEs in load-balancing mode.

(Optional) Setting a Redundancy Mode and DF Priority per ESI Instance: In a scenario where multiple CEs are dual-homed to PEs, if you want to use different transmission modes (load balancing and non-load balancing) to send unicast traffic to different CEs or if you want to specify DFs for traffic forwarding by setting priority values, you can set a redundancy mode and DF priority values based on ESIs.

(Optional) Configuring a BGP EVPN RR: Configuring a BGP EVPN RR helps reduce the number of required BGP EVPN peer relationships, and therefore saves network resources.

(Optional) Configuring Proxy ARP: When users access each other for the first time, they send ARP request packets. These packets are broadcast on Layer 2 networks. Proxy ARP can be configured to reduce the number of ARP broadcast packets.

Checking the Configurations: After configuring EVPN, verify the operating status and information about EVPN functions.