VXLAN Full Interworking Mode inter-network-routing / connection

xyzxyz — Thu, 01 Oct 2026 14:35:42 GMT

Hello,

I configured vxlan-full-interworking mode on a VSP7400 v-IST Cluster with FabricEngine 9.3.2.

The goal of this setup is to stretch on-prem vlans to a cloud provider. switches have transfer network to customers firewall with vrrp configured.

I configured local loopback interface with ip/32 configured vtep source ip (loopback interface ip) and remote vtep ip. Ping via IPSec works fine from source loopback-ip. VNIDs assigned to the local i-sids via "vnid i-sid" command. So basically as described here: https://documentation.extremenetworks.com/VOSS/SW/90/VOSSUserGuide/GUID-A73F50D4-3EB3-494A-A780-ABBA7965A3A4.shtml#GUID-A73F50D4-3EB3-494A-A780-ABBA7965A3A4

As we use flex-unis, I cannot assign the c-vid to mlt in the vnid.

switch1(config)#vnid 1001

switch1(vxlan:1001)#c-vid 1000 mlt 1

Error: In VXLAN_GW full interworking mode,Cannot configure SwUni endpoints under VNID

How can this be solved? With this configuration, connection in the same network is working, inter-network connection is not.

vlan create 1000 name "VLAN_1000" type port-mstprstp 0
vlan mlt 1000 1
vlan members 1000 1/1 portmember
vlan i-sid 1000 201000

vlan create 1001 name "VLAN_1001" type port-mstprstp 0
vlan mlt 1000 1
vlan members 1001 1/1 portmember
vlan i-sid 1001 201001

interface loopback 255
ip address 255 10.255.255.1/255.255.255.255
exit

vtep source-ip 10.255.255.1

#
# REMOTE VTEP CONFIGURATIONS
#

vtep 1 ip <Remote-VTEP-IP> name "Cloud-VTEP"

#
# VNID CONFIGURATION
#

vnid 1000 i-sid 201000
vtep 1
exit
vnid 1001 i-sid 201001
vtep 1
exit

Re: VXLAN Full Interworking Mode inter-network-routing / connection

harry085drop — Tue, 27 Oct 2026 05:16:39 GMT

Hello, full-interworking mode doesn't support configuring flex-UNI endpoints directly under a VNID. Check the ELAN I-SID mapping and VLAN associations, and verify MAC learning and firewall routing. Avoid switching to base-interworking mode, as it doesn't support vIST.

topic VXLAN Full Interworking Mode inter-network-routing / connection in ExtremeSwitching (VSP/Fabric Engine)

VXLAN Full Interworking Mode inter-network-routing / connection

Re: VXLAN Full Interworking Mode inter-network-routing / connection