Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
158
20.1.30
Fabric Extend over E-LAN/VPLS (L2) network using
Layer 3 over Layer 2 tunneling with VSP8000 or
VSP7200
When using the VSP 8000 or VSP 7200, please note that they only support a single next hop IP address
for all tunnels going through a single port. The ONA on the VSP 4000 does not have this restriction and as
shown in the previous example, it can it used to provide tunnels to many remote sites over a flat layer 2
core. However, we can add a loopback interface to a second VRF and use this interface as the tunnel
source IP address to overcome this limitation on the VSP 8000 or VSP 7200. To make this work, we need
to create a hairpin between the two VRF’s via an addition interface added to both VRF’s with the same IP
subnet in order for the core network to get to the tunnel network.
For this example, we will use a VSP 8000 at the main site with two VRFs named fab_ext and fab_lpbk. VRF
fab_ext will be used in the core while vrf fab_lpbk will be used with a loopback interface for the tunnel
source.