Description

When configuring multiple sub interfaces on interface which is used as EVPN VXLAN underlay to establish VTEP tunnels, the traffic forwarding is affected.

 

Configuration example -

 

set interfaces et-0/0/1 flexible-vlan-tagging

set interfaces et-0/0/1 unit 1 vlan-id 500

set interfaces et-0/0/1 unit 1 family inet address 1.1.1.1/24

set interfaces et-0/0/1 unit 2 vlan-id 501

set interfaces et-0/0/1 unit 2 family inet address 1.1.1.2/24

 

Symptoms

Traffic loss as well as sometimes VTEP not coming up

Solution

This configuration is not supported in EVPN/VXLAN setups on QFX/EX platforms. The recommendation is to always use unit 0 as underlay interface to establish VTEP.

 

Example -

 

set interfaces et-0/0/1 unit 0 family inet address 1.1.1.1/24

Modification History

Draft - 02/10/2023