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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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Application in VM Migration Scenarios on a VXLAN

Application in VM Migration Scenarios on a VXLAN

Service Description

Enterprises on data center networks deploy server virtualization to implement IT resource integration, improve resource usage, and reduce network costs. With the wider deployment of server virtualization, more VMs are running in physical servers, and more applications are running in virtualization environments, bringing challenges to virtual networks.

Networking Description

On the network shown in Figure 6-3, the enterprise has two servers in the data center: engineering and financial departments in Server1 and the marketing department in Server2.

The computation space on Server1 is inadequate, whereas that on Server2 is not fully utilized. The network administrator wants to migrate the engineering department to Server2 without affecting services.

Either IPv4 or IPv6 addresses can be configured for VMs. This means that a VXLAN overlay network can be an IPv4 or IPv6 network. Figure 6-3 shows an IPv4 overlay network.

Figure 6-3 Enterprise distribution networking

Feature Deployment

To ensure that services are not interrupted during the migration of the engineering department, the IP and MAC addresses of the engineering department must remain unchanged. This requires that the two Servers belong to the same Layer 2 network. Conventional methods would require additional physical devices for traffic distribution and may also result in network loops and additional system and management costs.

As a network virtualization technology that uses MAC-in-UDP encapsulation, VXLAN can be used to migrate the engineering department to Server 2. All end users who are reachable at Layer 3 can construct a large Layer 2 network as long as the physical network supports IP forwarding.

The migration process for the engineering department on an IPv4 overlay network is as follows:
  1. Migrate the engineering department from Server 1 to Server 2.
  2. After migration, VMs of the engineering department send gratuitous ARP or RARP packets to notify Device 2 and other devices of the migration event.
  3. Device 1 receives the packets and replaces existing MAC address and ARP entries with new MAC address and ARP entries of the post-migrated VMs.

VXLAN allows the engineering department to migrate, without making the network aware of it. After the engineering department is migrated from Server 1 to Server 2, tenants send gratuitous ARP or RARP packets. The MAC address and ARP entries of pre-migrated VMs saved on gateways are replaced by new MAC address and ARP entries of post-migrated VMs.

The migration process for the engineering department on an IPv6 overlay network is as follows:
  1. Migrate the engineering department from Server 1 to Server 2.

  2. After migration, the VMs of the engineering department send unsolicited NA packets to notify Device 2 and other devices of the migration event.

  3. Upon receipt of the unsolicited NA packets, Device 2 learns the MAC addresses and ND entries of the post-migrated VMs.

  4. Device 1 detects outbound interface changes in the ND entries, initiates ND aging detection, and deletes the MAC addresses and ND entries of the pre-migrated VMs.

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Updated: 2019-05-05

Document ID: EDOC1100004207

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