Administrator Guide

The topology to achieve RIOT with a physical loopback is inherently susceptible to Layer 2 loops. To prevent these loops from
disrupting the network, the following egress masks need to be applied:
● Any frame ingressing on a VXLAN access port is not allowed to egress out of a VXLAN loopback port.
● Any frame ingressing on a VXLAN loopback port is not allowed to egress out of a VXLAN access port.
● Any frame ingressing on a Non-VXLAN loopback port is not allowed to egress out of a VXLAN access port.
● Any frame ingressing on a Non-VXLAN loopback port is not allowed to egress out of a VXLAN loopback port.
Routing protocols and other control protocols are not supported over VXLAN tunnel (with the exception of VRRP).
Admin VRRP is not supported over VXLAN tunnel.
While 4000 VLANS or VNIDs are supported in a Layer 2 context; for VXLAN RIOT, the number of VLANS or VNIDs supported is
limited to 1000.
Configuring VXLAN RIOT
Physical Loopback
In order for this configuration to work, the physical loopback ports are required to be in port-channels. There are two types of
physical loopback interfaces: VXLAN Loopback Port and Non-VXLAN Loopback Port. These two port-channels are implicitly
made no spanning tree, so that they do not go into a blocked state if xSTP is enabled.
Internal Loopback
To configure internal loopback port-channels, add free ports in the device as members of a port-channel, say 10, then configure
vxlan-instance 1 loopback. Free ports should be in no shutdown mode.
1. To provision these ports for physical loopback, enter the following command:
Dell(conf-if-po-10)#vxlan-instance 1 [loopback port-channel id]
Where Po-10 is the VXLAN loopback port and Po-20 is the non-VXLAN loopback port.
2. To provision these ports for internal loopback, enter the following command:
Dell(conf-if-po-10)# vxlan-instance 1 loopback
Example for Physical Loopback:
Dell(conf-if-po-10)#vxlan-instance 1 loopback port-channel 20
Example for Internal Loopback:
Dell(conf-if-po-10)#vxlan-instance 1 loopback
VLT Scenario
VXLAN RIOT with physical loopback and internal loopback are supported in a VLT environment.
VXLAN RIOT with Physical Loopback
To enable VXLAN RIOT in a VLT environment, the physical loopbacks are provisioned as VLT port channels with a peering
relationship. The following illustration shows a VLT VXLAN RIOT set up:
Virtual Extensible LAN (VXLAN)
1091