VXLAN and BGP EVPN Configuration Guide for Dell EMC SmartFabric OS10 Release 10.5.2

• The IP address of the VTEP source Loopback interface must be same on the VLT peers.
• If you use a port-scoped VLAN to assign tagged access interfaces to a virtual network, to identify traffic belonging to each virtual network, you must configure a unique VLAN ID for the VLT Interconnect (VLTi) link.
• Configure a VLAN to transmit VXLAN traffic over the VLTi link in VIRTUAL-NETWORK mode. All traffic sent and received from a virtual network on the VLTi carries the VLTi VLAN ID tag.
  Configure the same VLTi VLAN ID on both VLT peers. You cannot use the ID of an existing VLAN on a VLT peer or the reserved untagged VLAN ID. You can use the VLTi VLAN ID to assign tagged or untagged access interfaces to a virtual network.

  virtual-network vn-id
  vlti-vlan vlan-id

• Although a VXLAN virtual network has no access port members that connect to downstream servers, you must configure a switch-scoped VLAN or VLTi VLAN. The presence of this VLAN ensures that the VLTi link is added as a member of the virtual network so that mis-hashed ARP packets received from the VXLAN tunnel reach the intended VLT node.

• If a VLT peer loses connectivity to the underlay L3 network, it continues to transmit routing traffic to the network through the VLTi link on a dedicated L3 VLAN to the other VLT peer. Configure a L3 VLAN between VLT peers in the underlay network and enable routing on the VLAN; for example:

  OS10(config)# interface vlan4000
  OS10(config-if-vl-4000)# no shutdown
  OS10(config-if-vl-4000)# ip address 41.1.1.1/24
  OS10(config-if-vl-4000)# ip ospf 1 area 0.0.0.0

• To reduce traffic loss when a VLT peer boots up and joins an existing VLT domain, or when the VLTi links fails and the VLT peer is still up as detected by the VLT heartbeat, create an uplink state group. Configure all access VLT port channels on the peer as upstream links. Configure all network-facing links as downstream link. For example:

  OS10(config)# uplink-state-group 1
  OS10(conf-uplink-state-group-1)# enable
  OS10(conf-uplink-state-group-1)# downstream ethernet1/1/1-1/1/2
  OS10(conf-uplink-state-group-1)# upstream port-channel 10

OS10# show vlt-mac-inconsistency
Checking Vlan 228 .. Found 7 inconsistencies .. Progress 100%
VLAN 128
----------
MAC 00:00:00:00:00:02 is missing from Node(s) 2
VLAN 1
----------
MAC 00:a0:c9:00:00:18 is missing from Node(s) 2
MAC 00:a0:c9:00:00:20 is missing from Node(s) 2
VLAN 131
----------
MAC 00:00:00:00:00:02 is missing from Node(s) 2
VLAN 132
----------
MAC 00:00:00:00:00:02 is missing from Node(s) 2
VLAN 135
----------
MAC 00:00:00:00:00:02 is missing from Node(s) 2
VLAN 137
----------
MAC 00:00:00:00:00:02 is missing from Node(s) 2
Run "show vlt d1 mismatch ..." commands to identify configuration issues