Configure a Generic Routing Encapsulation (GRE) topology on ExtremeCloud IQ
Controller. The
VPN
Concentrator must be configured in ExtremeCloud IQ
Controller before it
can be used to define a GRE tunneled topology.
To configure the GRE VLAN topology:
-
Go to .
-
Configure the following parameters:
- VLAN Name
- Name of the GRE VLAN
- Mode
- Select GRE for a Generic Routing
Encapsulation (GRE) tunnel.
- VLAN ID
- The ID of the VLAN.
This value must be unique.
- Tagged
- Specify if the egress
port traffic is tagged or untagged. Most GRE VLAN topologies must be
tagged. Each concentrator can support only one untagged
topology. Select Tagged to tag the topology.
- Concentrators
- List of VPN
Concentrators.
Select a concentrator from the list, then select
Add. You can add up to three concentrators to a
single topology. When more than one termination point is added
to the list, failover is supported.
The order of the
termination points is significant. The primary concentrator must
be the first termination point in the list. The AP issues a ping
request to the first termination point. If that request fails,
it pings the second point, and then the third point. With this
organization, you can use the same three concentrators for
multiple VLANs, and by varying the termination point order for
each VLAN, you can balance the traffic load.
Note
It is a best practice to configure more than one VPN Concentrator per
VLAN topology for failover. A topology that uses a single generic (non-encrypted) GRE
tunnel, without configured backups, is not using the available mechanisms to detect if a VPN
Concentrator is down. Therefore, no AP alarms, related to the tunnel connectivity, are
generated for such a topology.
