Deployment Guide

network IP addresses in different subnets. If you do not assign the virtual-network interface to a tenant VRF, it is assigned
to the default VRF.
interface virtual-network vn-id
ip vrf forwarding tenant-vrf-name
ip address ip-address/mask
no shutdown
exit
4. Configure an anycast gateway IPv4 or IPv6 address for each virtual network in INTERFACE-VIRTUAL-NETWORK mode. This
anycast IP address must be in the same subnet as the IP address of the virtual-network interface in Step 3.
Configure the same IPv4 or IPv6 address as the anycast IP address on all VTEPs in a virtual network. All hosts use the
anycast gateway IP address as the default gateway IP address in the subnet that connects to the virtual-network interface
configured in Step 3. Configure the anycast gateway IP address on all downstream VMs. Using the same anycast gateway
IP address allows host VMs to move from one VTEP to another VTEP in a VXLAN. Dell EMC recommends using an anycast
gateway in both VLT and non-VLT VXLAN configurations.
interface virtual-network vn-id
ip virtual-router address ip-address
Configuration notes for virtual-network routing:
● VXLAN overlay routing includes routing tenant traffic on the ingress VTEP and bridging the traffic on the egress VTEP. The
ingress VTEP learns ARP entries and associates all destination IP addresses of tenant VMs with the corresponding VM MAC
addresses in the overlay. On the ingress VTEP, configure a virtual network for each destination IP subnet even if there are
no locally attached hosts for an IP subnet.
● Open Shortest Path First (OSPF) routing protocol is not supported on the virtual-network interface in the overlay network.
However, BGP and static routes that point to a virtual-network interface or to a next-hop IP address that belongs to a
virtual-network subnet are supported.
● VLT peer routing is not supported in a virtual network. A packet destined to the virtual-network peer MAC address L2
switches instead of IP routes. To achieve active-active peer routing in a virtual network, configure the same virtual anycast
gateway IP and MAC addresses on both VTEP VLT peers and use the anycast IP as the default gateway on the VMs.
● Virtual Router Redundancy Protocol (VRRP) is not supported on a virtual-network interface. Configure the virtual anycast
gateway IP address to share a single gateway IP address on both VTEP VLT peers and use the anycast IP as default gateway
on the VMs.
● Internet Group Management Protocol (IGMP) and Protocol-Independent Multicast (PIM) are not supported on a virtual-
network interface.
The following tables show how to use anycast gateway IP and MAC addresses in a data center with three virtual networks and
multiple VTEPs:
● Globally configure an anycast MAC address for all VTEPs in all virtual networks. For example, if you use three VTEP switches
in three virtual networks:
Table 1. MAC address for all VTEPs
Virtual network VTEP Anycast gateway MAC address
VNID 11 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
VNID 12 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
VNID 13 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
● Configure a unique IP address on the virtual-network interface on each VTEP across all virtual networks. Configure the same
anycast gateway IP address on all VTEPs in a virtual-network subnet. For example:
Table 2. IP address on the virtual-network interface on each VTEP
12 VXLAN