Profile Overrides - GRE

GRE (Generic routing encapsulation) tunneling can be configured to bridge Ethernet packets between WLANs and a remote WLAN gateway over a GRE tunnel. The tunneling of 802.3 packets using GRE is an alternative to MiNT or L2TPv3. Related features like ACLs for extended VLANs are still available using layer 2 tunneling over GRE.

Using GRE, access points map one or more VLANs to a tunnel. The remote endpoint is a user-configured WLAN gateway IP address, with an optional secondary IP address should connectivity to the primary GRE peer be lost. VLAN traffic is expected in both directions in the GRE tunnel. A WLAN mapped to these VLANs can be either open or secure. Secure WLANs require authentication to a remote RADIUS server available within your deployment using standard RADIUS protocols. access points can reach both the GRE peer as well as the RADIUS server using IPv4.

To override an access point's GRE tunnel configuration.

  1. Go to Configuration → Devices → Device Overrides.

    The Device Overrides screen displays. This screen lists devices within the managed network.

  2. Select an access point.

    The selected access point's configuration menu displays.

  3. Expand Network and select GRE.

    The GRE Tunnel screen displays. This screen lists existing GRE tunnel configurations.

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    Profile Overrides - Network - GRE Configuration Main Screen
  4. Select a tunnel from those listed on the screen and click Edit.

    You can add new tunnels or delete existing tunnels.

    The GRE tunnel configuration screen displays.

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    GRE Tunnel - Add/Edit Configuration Screen
  5. If creating a new GRE tunnel, assign it a name to distinguish its configuration.
  6. Define the following GRE tunnel configurations:

    DSCP Options

    Use the spinner control to set the tunnel DSCP / 802.1q priority value from encapsulated packets to the outer packet IPv4 header.

    Tunneled VLANs

    Define the VLAN connected clients use to route GRE tunneled traffic within their respective WLANs.

    Native VLAN

    Set a numerical VLAN ID (1 - 4094) for the native VLAN. The native VLAN allows an Ethernet device to associate untagged frames to a VLAN when no 802.1Q frame is included in the frame. Additionally, the native VLAN is the VLAN untagged traffic is directed over when using a port in trunk mode.

    Tag Native VLAN

    Select this option to tag the native VLAN. The IEEE 802.1Q specification is supported for tagging frames and coordinating VLANs between devices. IEEE 802.1Q adds four bytes to each frame identifying the VLAN ID for upstream devices that the frame belongs. If the upstream Ethernet device does not support IEEE 802.1Q tagging, it does not interpret the tagged frames. When VLAN tagging is required between devices, both devices must support tagging and be configured to accept tagged VLANs. When a frame is tagged, the 12 bit frame VLAN ID is added to the 802.1Q header so upstream Ethernet devices know which VLAN ID the frame belongs to. The device reads the 12 bit VLAN ID and forwards the frame to the appropriate VLAN. When a frame is received with no 802.1Q header, the upstream device classifies the frame using the default or native VLAN assigned to the Trunk port. The native VLAN allows an Ethernet device to associate untagged frames to a VLAN when no 802.1Q frame is included in the frame. This feature is disabled by default.

  7. In the Peer table, click +Add Row and provide a maximum of two peer configurations.

    The Peer table lists the credentials of the GRE tunnel end points.

    Peer Index

    Assign a numeric index to each peer to help differentiate tunnel end points.

    Peer IP Address

    Define the IP address of the added GRE peer to serve as a network address identifier.

  8. Set the following Establishment Criteria for the GRE tunnel:


    Specify the establishment criteria for creating a GRE tunnel. In a multicontroller within a RF domain, it‘s always the master node with which the tunnel is established. Dependimg on which of the following options is selected, the GRE is established:
    • vrrp-master - The tunnel is created only if the master node is the VRRP master.

    • cluster-master - The tunnel is created only if the master node is the cluster master.

    • rf-domain-manager - The tunnel is created only if the master node is the RF Domain manager.

    • always - The tunnel is automatically created, irrespective of whether the master node (device) is any one of the above three (3). In other words, the master node need not be any of the above three for the tunnel to be established.

    VRRP Group

    Set the VRRP group ID only enabled when the Establishment Criteria is set to vrrp-master. A virtual router redundancy group nables the creation of a group of routers as a default gateway for redundancy. Clients can point to the IP address of the VRRP virtual router as their default gateway and utilize a different group member if a master becomes unavailable.

  9. Define the following Failover parameters:

    Enable Failover

    Select this option to periodically ping the primary gateway to assess its availability for failover support.

    Ping Interval

    Set the duration between two successive pings to the gateway. Define this value in seconds from 0 - 86,400.

    Number of Retries

    Set the number of retry ping opportunities before the session is terminated.

  10. Select the OK button located to save the changes.

    Select Reset to revert to the last saved configuration.