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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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Configuring VXLAN in Distributed Gateway Mode Using BGP EVPN

Configuring VXLAN in Distributed Gateway Mode Using BGP EVPN

Distributed VXLAN gateways can be configured to address problems that occur in legacy centralized VXLAN gateway networking, for example, forwarding paths are not optimal, and the ARP or ND entry specification is a bottleneck on Layer 3 gateways.

Usage Scenario

Figure 8-7 Centralized VXLAN gateway networking

In legacy networking, a centralized Layer 3 gateway is deployed on a spine node. On the network shown in Figure 8-7, packets across different networks must be forwarded through a centralized Layer 3 gateway, resulting in the following problems:
  • Forwarding paths are not optimal. All Layer 3 traffic must be transmitted to the centralized Layer 3 gateway for forwarding.
  • The ARP or ND entry specification is a bottleneck. ARP entries must be generated for tenants on the Layer 3 gateway. However, only a limited number of ARP or ND entries can be configured for the Layer 3 gateway, impeding data center network expansion.

To address these problems, distributed VXLAN gateways can be configured. On the network shown in Figure 8-8, Server 1 and Server 2 on different network segments both connect to Leaf 1. When Server 1 and Server 2 communicate, traffic is forwarded only through Leaf 1, not through any spine node.

Figure 8-8 Distributed VXLAN gateway networking
Distributed VXLAN gateway networking has the following characteristics:
  • Flexible deployment. A leaf node can function as both Layer 2 and Layer 3 VXLAN gateways.

  • Improved network expansion capabilities. A leaf node only needs to learn the ARP or ND entries of servers attached to it. A centralized Layer 3 gateway in the same scenario, however, has to learn the ARP or ND entries of all servers on the network. Therefore, the ARP or ND entry specification is no longer a bottleneck on a distributed VXLAN gateway.

  • Improved network performance. After a leaf node receives an ARP request packet from a tenant or server, the leaf node determines whether to broadcast it. This function suppresses ARP broadcast traffic.

Either IPv4 or IPv6 addresses can be configured for the VMs and Layer 3 VXLAN gateway. This means that a VXLAN overlay network can be an IPv4 or IPv6 network. Figure 8-8 shows an IPv4 overlay network.

Pre-configuration Tasks

Before configuring VXLAN in distributed gateway mode, ensure that reachable routes are available.

Configuration Procedures

Figure 8-9 Flowchart of configuring VXLAN in distributed gateway mode

NOTE:

If only VMs on the same network segment need to communicate with each other, Layer 3 VXLAN gateways do not need to be deployed. If VMs on different network segments need to communicate with each other or VMs on the same network segment need to communicate with external networks, Layer 3 VXLAN gateways must be deployed.

The following table lists the differences between the centralized gateway configuration procedures for an IPv4 overlay network and an IPv6 overlay network.

Differed Configuration Task

IPv4 Overlay Network

IPv6 Overlay Network

Configure a Layer 3 VXLAN gateway.

  • During configuration of a VPN instance for route exchange with an EVPN instance, enable the IPv4 address family of the VPN instance and then complete other configurations in the IPv4 address family view.

  • Configure an IPv4 address for a VBDIF interface of the Layer 3 VXLAN gateway.

  • VXLAN gateways can advertise both IRB routes and IP prefix routes.

  • Complete configurations of IP prefix route advertisement between VXLAN gateways in the IPv4 address family view of the BGP-VPN instance.

  • If VXLAN gateways advertise IP prefix routes, run the arp direct-route enable [ route-policy route-policy-name ] command to configure host route advertisement.

  • During configuration of a VPN instance for route exchange with an EVPN instance, enable the IPv6 address family of the VPN instance and then complete other configurations in the IPv6 address family view.

  • Configure an IPv6 address for a VBDIF interface of the Layer 3 VXLAN gateway.

  • VXLAN gateways can advertise only IP prefix routes.

  • Complete configurations of IP prefix route advertisement between VXLAN gateways in the IPv6 address family view of the BGP-VPN instance.

  • If VXLAN gateways advertise IP prefix routes, run the ipv6 nd direct-route enable [ route-policy route-policy-name ] command to advertise host routes.

(Optional) Configure BFD for VXLAN.

Supported

Not supported

(Optional) Configure ARP broadcast suppression.

Supported

Not supported

(Optional) Configure static ARP/MAC address entries and MAC address limiting.

Supported

Static ARP entry configuration not supported

(Optional) Configure IP address conflict detection parameters.

Supported

Not supported

(Optional) Configure Layer 2 proxy ARP.

Supported

Not supported

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Updated: 2019-05-05

Document ID: EDOC1100004207

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