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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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VXLAN on VLT

VLT peers are two nodes in the network that are loosely coupled. It provides high availability to the other ends. VXLAN on VLT provides resiliency to the servers connected to southbound port-channels and VTEPS connected through L3 cloud to northbound interfaces. As gateway IP address configuration on both peers is the same, remote VTEP’s view it as a single node. Packets from remote VTEP’s can land on any node, either VLT primary or secondary. Southbound interfaces are connected via port channels. Even if a port-channel member connected to one peer is down, the server can send/receive traffic through the other VLT peer.

Static VXLAN Configuration in a VLT setup

The figure below shows the topology for a data-center interconnect, in which static VXLAN is used for linking geographically dispersed data centers. VXLAN tunnels are used to communicate across the data centers. VXLAN on VLT provides high availability to the L3 network and to the servers connected via LAG.

Image: Topology for VXLAN on VLT.

Configuration steps are covered below:
  1. Both Gateway VTEPs need VLT configured.
    • ICL port configuration
      interface Port-channel 1
no ip address
channel-member TenGigabitEthernet 0/4-5
no shutdown
    • VLT Domain Configuration
      vlt domain 100
 peer-link port-channel 1
 back-up destination 10.11.70.14   this is ip address of the peer node
    • VXLAN Instance Configuration
      vxlan-instance 1 static
  local-vtep-ip 14.14.14.14
  no shutdown
  vni-profile test
   vnid 200
  remote-vtep-ip 3.3.3.3 vni-profile test
    • VLT Access port configuration
      interface TengigabitEthernet 0/12
port-channel-protocol lacp
port-channel 30 mode active
interface Port-channel 30
 no ip address
 vxlan-instance 1
 switchport
 vlt-peer-lag port-channel 30
 no shutdown 
  2. Configure loopback interface and VXLAN instances on both the peers.
    • Configure loopback interface IP address on both peers with the same IPaddress.
      interface Loopback 1
 ip address 14.14.14.14/32
 no shutdown
  3. Configure VXLAN instance on access port for both the peers.
    • Access Port Configuration
      interface Port-channel 30
 vxlan-instance 1
 no ip address
  channel-member TenGigabitEthernet 0/12
 vlt-peer-lag port-channel 30
 no shutdown
    • VLAN Configuration
      interface Vlan 200
 vxlan-vnid 200    --- VNID for this VLAN
 no ip address
 tagged PortChannel 30
 no shutdown
  4. Configure routing protocol or static addresses to establish a L3 path to the remote VTEP.

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