User's Manual

167 | Network Configuration Parameters Dell Networking W-Series ArubaOS 6.4.x| User Guide
8. The controller boots up with the changed controller IP address. of the selected VLAN ID.
Using the CLI
(host)(config) #controller-ip [loopback|vlan <VLAN ID>]
Configuring GRE Tunnels
A controller supports generic routing encapsulation (GRE) tunnels between the controller and APs. An AP opens
a GRE tunnel to the controller for each radio interface. On the AP, the other end of the GRE tunnel is specified
by the IP address configured and the variable values (in descending order of priority): <master>, <servername>,
and <serverip>. If these variable are left to default values, the AP uses DNS to look up Dell-master to discover
the IP address of the controller.
The controller also supports GRE tunnels between the controller and other GRE-capable devices. Static IPv6
L2/L3 GREtunnelscan be established between Dell devices and other devices that support IPv6 GRE tunnel.
IPv4 and IPv6 L2 GRETunnels carry both IPv6 and IPv4 traffic, and the IPv6 traffic can be redirected over the
IPv4 L3 GRETunnel. This section describes how to configure a GRE tunnel to such a device, and how to direct
traffic into the tunnel.
The controller uses GREtunnels for communication between master and local controllers; these GREtunnels are
automatically created and are not subject to the configuration described in this section. This feature is supported
only in IPv4.
If a VLANinterface has multiple IPv6 addresses configured, one of them is used as the tunnel source IPv6 address. If
the selected IPv6 address is deleted from the VLAN interface, then the tunnel source IPis re-configured with the next
available IPv6 address.
Important Points to Remember
l By default a GRE Tunnel Interface is in IPv4 L3 mode.
l IPv6 configurations will be allowed on an IPv4 Tunnel only if the tunnel mode is set to IPv6. Similarly, IPv4
configurations will be allowed on an IPv6 Tunnel only if the tunnel mode is set to IP.
Limitations
ArubaOS does not support the following functions for Static IPv6 GRETunnels:
l IPv6 Auto configuration and IPv6 Neighbor Discovery mechanisms do not apply to IPv6 tunnels.
l No support for Tunnel encapsulation limit and MTU discovery options on the IPv6 tunnels.
l You cannot use IPv6 GRE for a master-local setup as IPSec is not supported in this release.
Creating a Tunnel Interface
To create a GRE tunnel on the controller, you need to specify the following:
l Tunnel ID: a number between 1 and 2147483647.