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Configuration Guide - VXLAN

CloudEngine 12800 and 12800E V200R003C00

This document describes the configurations of VXLAN.
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Applications of Using VXLAN to Implement DCI

Applications of Using VXLAN to Implement DCI

Service Description

To meet the requirements of geographical redundancy, inter-regional operations, and user access, an increasing number of enterprises are deploying data centers (DCs) across multiple regions. Data Center Interconnect (DCI) is a solution that enables intercommunication between the VMs of multiple DCs. Using technologies such as VXLAN and BGP EVPN, DCI securely and reliably transmits DC packets over carrier networks. With DCI, intercommunication between the VMs of multiple DCs is possible regardless of whether these VMs reside on the same VLAN.

End-to-End VXLAN

Networking Description

As shown in Figure 6-4, BGP EVPN transmits MAC or host routing information between Leaf 1 in DC A and Leaf 4 in DC B. The next hop of the MAC or host route is not changed during transmission. This process establishes an end-to-end tunnel between the VTEPs on Leaf 1 and Leaf 4.

Figure 6-4 Application of using end-to-end VXLAN to implement DCI
Deployment Requirements
  • Configure BGP EVPN on Leaf 1 and Leaf 2 in DC A and establish an IBGP peer relationship between them. Configure BGP EVPN on Leaf 3 and Leaf 4 in DC B and establish an IBGP peer relationship between them too.
  • Configure Leaf 2 and Leaf 3, which are deployed on DC network edge, to advertise routes to EBGP peers without changing the next hops of the routes.
  • Configure BGP EVPN on Leaf 1 in DC A and Leaf 4 in DC B to establish an end-to-end VXLAN tunnel.

VLAN Hand-off

Networking Description

As shown in Figure 6-5, BGP EVPN is configured to establish VXLAN tunnels in both DC A and DC B so that the VMs deployed in each DC can communicate with each other. Through Layer 2 sub-interfaces, Leaf 2 accesses DCI-VTEP 1 and Leaf 3 accesses DCI-VTEP 2. EVPN is configured to establish a VXLAN tunnel between DCI-VTEP 1 and DCI-VTEP 2 so that the VMs can communicate across DCs. Leaf 2 and Leaf 3 decapsulate the VXLAN packets they receive from DCs and send them to a DCI-VTEP. The DCI-VTEP receives these packets, re-encapsulates them into VXLAN packets, and then sends them to the peer DCI-VTEP. This process allows VXLAN tunnels to provide end-to-end bearing for inter-DC packets and ensures that the VMs in different DCs can communicate with each other.

Figure 6-5 Application of using VLAN hand-off to implement DCI
Deployment Requirements
  • Configure BGP EVPN on Leaf 1 and Leaf 2 in DC A to establish a VXLAN tunnel between them. Configure BGP EVPN on Leaf 3 and Leaf 4 in DC B to establish a VXLAN tunnel between them. Then, configure EVPN to create a VXLAN tunnel between the DCI-VTEPs.
  • Configure VXLAN on Leaf 2 and Leaf 3, which are deployed on DC network edge, so that they can access the DCI-VTEPs through VLAN.
  • Configure VXLAN on the DCI-VTEPs so that they can access Leaf 2 and Leaf 3 through VLAN.

Segment VXLAN

Networking Description

Segment VXLAN establishes one VXLAN tunnel segment in each of the two DCs and also establishes one VXLAN tunnel segment between the DCs. As shown in Figure 6-6, BGP EVPN is used to create VXLAN tunnels in distributed gateway mode within both DC A and DC B so that the VMs deployed in each DC can communicate with each other. Leaf 2 and Leaf 3 are the edge devices within the DCs that connect to the backbone network. BGP EVPN is used to configure VXLAN tunnels on Leaf 2 and Leaf 3 so that the VXLAN packets received by one DC can be decapsulated, re-encapsulated, and sent to the peer DC. This process provides end-to-end bearing for inter-DC VXLAN packets and ensures that VMs in different DCs can communicate with each other.

Figure 6-6 Application of using segment VXLAN to implement DCI
Deployment Requirements
  • Configure EVPN on Leaf 1 and Leaf 2 in DC A to establish a distributed VXLAN tunnel between them. Configure EVPN on Leaf 3 and Leaf 4 in DC B to establish a distributed VXLAN tunnel between them.
  • Configure EVPN on Leaf 2 and Leaf 3 to establish a VXLAN tunnel between them.
  • On Leaf 2 and Leaf 3, configure route regeneration for the EVPN address family.
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Updated: 2019-05-05

Document ID: EDOC1100004207

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