loopback-port

Syntax

Hierarchy Level

Description

Define the global loopback aggregated Ethernet interface for VXLAN routing on QFX5210 leaf devices in EVPN-VXLAN edge-routed bridging (ERB) overlay fabrics.

Specify loopback-port using its physical interface name, without a specific unit number (such as ae0 rather than ae0.100, for example).

Note:

The Packet Forwarding Engine restarts when you configure or update this setting.

QFX5210 switches don't have native VXLAN routing hardware support for Layer 3 VXLAN gateway functions. Instead, the switch uses an intermediary loopback port in a two-pass process for routing in and out of VXLAN tunnels (RIOT). You configure a loopback link aggregation group (LAG) and use this statement to assign it as the RIOT loopback LAG port on the device.

Keep the following in mind when you configure the RIOT loopback LAG:

• When you configure the loopback LAG members, you can include any network ports on the switch that you're not using for another purpose. Based on your VXLAN routing traffic load, you can adjust:

  • The number of links in the LAG.

  • The minimum number of links for the LAG to be considered "up".

• You must configure the loopback LAG interface as a member of all VLANs with IRB interfaces used for VXLAN routing.

• Configure the loopback LAG interface:

  • As a trunk interface

  • With encapsulation flexible-ethernet-services and flexible-vlan-tagging

• The device automatically turns off MAC learning on the interface when you set it as the loopback LAG port. In this way, upon receiving packets on the loopback port, the device avoids learning the port's own MAC address.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 21.3R1 for QFX5210 switches.