Concept Guide

232 | VPN Configuration Dell Networking W-Series Instant 6.4.3.1-4.2.0.0 | User Guide
l If the primary LNS is down, it fails over to the backup LNS. L2TPv3 has one tunnel profile and under this,
one primary peer and a backup peer are configured. If the primary tunnel creation fails or if the primary
tunnel gets deleted, the backup starts. The following two failover modes are supported:
n Preemptive: In this mode, if the primary comes up when the backup is active, the backup tunnel is
deleted and the primary tunnel resumes as an active tunnel. If you configure the tunnel to be
preemptive, and when the primary tunnel goes down, it starts the persistence timer which tries to bring
up the primary tunnel.
n Non-Preemptive: In this mode, when the backup tunnel is established after the primary tunnel goes
down, it does not make the primary tunnel active again.
l L2TPV3 is not supported on W-IAP205 devices.
You can configure an L2TPv3 tunnel and session profiles through the Instant UI or CLI.
In the Instant UI
1. Click the More > VPN link at the top right corner of the Instant UI. The Tunneling window is displayed.
Figure 55 L3TPv3 Tunneling
2. Select L2TPv3 from the Protocol drop-down list.
3. Configure the tunnel profile:
a. Enter the tunnel name to be used for tunnel creation.