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Manually Configuring VXLANs on QFX Series and EX4600 Switches

You can configure QFX5100, QFX5110, QFX5200, QFX5210, and EX4600 switches to act as a VTEP. (If the switch is acting as a transit Layer 3 switch for downstream VTEPs, you do not need to perform the steps in this topic as no special configuration is needed.)

Note:

To ensure that QFX Series and EX4600 switches that are configured to act as VTEPs function properly, you must enable a routing protocol, for example, OSPF, on the VTEPs’ loopback interface and Layer 3 interfaces. For more information about configuring OSPF on a VTEP, see Examples: Manually Configuring VXLANs on QFX Series and EX4600 Switches.

Configuring a Source IP Address

On a switch that will act as a VTEP, you must configure an IP address that will be used as the source address in the outer IP header of the VXLAN packet. This is the VXLAN tunnel source address.

  1. Create a reachable IPv4 address on the loopback interface.
  2. Configure the address to be used as the tunnel source address.

Configuring PIM for VXLANs

If you are not using an SDN controller to create a VXLAN control plane, you must enable PIM on the switch so that the VTEP can use multicast groups to establish reachability with other VTEPs and to forward BUM traffic.

  1. Enable PIM on the interface that connects to the Layer 3 network. This is the interface that performs the VXLAN encapsulation and de-encapsulation.
  2. Configure the address of a PIM rendezvous point.

Configuring VXLANs

You configure VXLANs under the vlan stanza (which is why QFX5100, QFX5110, QFX5200, QFX5210, and EX4600 switches support 4000 VXLANs). You must also configure the server-facing interfaces to be VLAN members.

  1. Create a VLAN to VXLAN mapping and assign a multicast group address to the VXLAN. All members of a VXLAN must use the same multicast group address.
  2. (Optional) Configure the switch to retain the original VLAN tag (in the inner Ethernet packet) after VXLAN encapsulation. By default, the original tag is dropped when the packet is encapsulated.
  3. (Optional) Configure the switch to de-encapsulate and accept original VLAN tags in VXLAN packets. By default, the original tag is dropped when the packet is encapsulated.
  4. Configure server-facing interfaces to support multiple VLANs.

    You must create a VLAN to VXLAN mapping for each VLAN that will need Layer 2 connectivity over the Layer 3 network.

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