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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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(Optional) Configuring ARP Broadcast Suppression

(Optional) Configuring ARP Broadcast Suppression

When tenants communicate with each other for the first time, they send ARP requests. These ARP requests are broadcast on Layer 2 networks and may cause a broadcast storm. To prevent this problem, ARP broadcast suppression can be enabled on Layer 2 VXLAN gateways.

Context

After you enable ARP broadcast suppression on a Layer 2 VXLAN gateway, configure Border Gateway Protocol Ethernet virtual private network (BGP EVPN) on Layer 2 and Layer 3 VXLAN gateways to allow ARP broadcast suppression to take effect. BGP EVPN can then generate host information based on learned ARP entries and advertise the host information to Layer 2 VXLAN gateways. After the Layer 2 VXLAN gateways receive ARP broadcast packets, they convert the ARP broadcast packets into unicast packets based on the learned host information before forwarding the packets out. This decreases the number of broadcast packets in a BD, improving network performance.

Configuring BGP RRs is recommended to simplify BGP configuration. Layer 3 VXLAN gateways are generally used as RRs, and Layer 2 VXLAN gateways as RR clients.

NOTE:

ARP broadcast suppression in VXLAN scenarios applies only to IPv4 overlay networks.

Procedure

  1. Configure BGP EVPN on Layer 2 and Layer 3 VXLAN gateways to advertise host information.

    1. Run system-view

      The system view is displayed.

    2. Run bgp as-number [ instance instance-name ]

      The BGP or BGP multi-instance view is displayed.

    3. Run l2vpn-family evpn

      The BGP-EVPN address family view or BGP multi-instance EVPN address family view is displayed.

      By default, the BGP-EVPN address family or BGP multi-instance EVPN address family view is disabled.

    4. By default, a device does not advertise ARP or IRB routes to a BGP EVPN peer. To advertise ARP or IRB routes to suppress ARP broadcast packets, you can run either of the following commands to configure and advertise only one type of routes:

      • To configure ARP route advertisement, run the peer { ipv4-address | group-name } advertise arp command.

      • To configure IRB route advertisement, run the peer { ipv4-address | group-name } advertise irb command.
    5. Run commit

      The configuration is committed.

  2. Enable BGP EVPN on a Layer 3 VXLAN gateway to collect host information.

    1. Run system-view

      The system view is displayed.

    2. Run interface vbdif bd-id

      The VBDIF interface view is displayed.

    3. Run arp collect host enable

      BGP EVPN is enabled to collect host information.

      By default, BGP EVPN is disabled from collecting host information.

    4. Run commit

      The configuration is committed.

  3. Enable ARP broadcast suppression on a Layer 2 VXLAN gateway.

    1. Run system-view

      The system view is displayed.

    2. Run bridge-domain bd-id

      The BD view is displayed.

    3. Run arp broadcast-suppress [ mismatch-discard ] enable

      ARP broadcast suppression is enabled.

      By default, ARP broadcast suppression is disabled.

    4. Run commit

      The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004207

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