Viewing and Changing the Physical Topologies

1. From the top menu, click Controller.
2. In the left pane, click Network > Topologies. The Topologies tab is displayed.

   An associated topology entry is created by default for each L2 Port with the same name.

   

   
3. To change any of the associated parameters, click on the topology entry to be modified. The Edit Topology dialog appears.
   

   

   For the data ports predefined in the system, Name and Mode are not configurable.

4. Optionally, configure one of the physical topologies for Third Party AP connectivity by clicking the 3rd Party AP Topology checkbox.

   You must configure a topology to which you will be connecting third-party APs by checking this box. Only one topology can be configured for third-party APs.

   Third-party APs must be deployed within a segregated network for which the controller becomes the single point of access (i.e., routing gateway). When you define a third-party AP topology, the interface segregates the third-party AP from the remaining network.

5. To configure an interface for VLAN assignment, configure the VLAN Settings in the Layer 2 box.

   When you configure a controller port to be a member of a VLAN, you must ensure that the VLAN configuration (VLAN ID, tagged or untagged attribute, and Port ID) is matched with the correct configuration on the network switch.

6. To replicate topology settings, click Synchronize in the Status box.
7. If the desired IP configuration is different from the one displayed, change the Interface IP and Mask accordingly in the Layer 3 box.

   For this type of data interface, the Layer 3 check box is selected automatically. This allows for IP Interface and subnet configuration together with other networking services.

8. The MTU value specifies the Maximum Transmission Unit or maximum packet size for this topology. The fixed value is 1500 bytes for physical topologies.

   If you are using OSPF, be sure that the MTU of all the interfaces in the OSPF link match.

   

   Note

   If the routed connection to an AP traverses a link that imposes a lower MTU than the default 1500 bytes, the controller and AP participate in automatic MTU discovery and adjust their settings accordingly. At the controller, MTU adjustments are tracked on a per AP basis. If the ExtremeWireless software cannot discover the MTU size, it enforces the static MTU size.
9. To enable AP registration through this interface, select the AP Registration checkbox.

   Wireless APs use this port for discovery and registration. Other controllers can use this port to enable inter-controller device mobility if this port is configured to use SLP or the controller is running as a manager and SLP is the discovery protocol used by the agents.

10. To enable management traffic, select the Management Traffic checkbox. Enabling management provides access to SNMP (v1/v2c, v3), SSH, and HTTPs management interfaces.
    

    Note

    This option does not override the built-in protection filters on the port. The built-in protection filters for the port, which are restrictive in the types of packets that are allowed to reach the management plane, are extended with a set of definitions that allow for access to system management services through that interface (SSH, SNMP, HTTPS:5825).
11. To enable the local DHCP (Dynamic Host Configuration Protocol) Server on the controller, in the DHCP box, select Local Server. Then, click on the Configure button to open the DHCP configuration pop up window.
    

    

    

    Note

    The local DHCP Server is useful as a general-purpose DHCP Server for small subnets.
    1. In the Domain Name box, type the name of the domain that you want the APs to use for DNS Server‘s discovery.
    2. In the Lease (seconds) default box, type the time period for which the IP address will be allocated to the APs (or any other device requesting it).
    3. In the Lease (seconds) max box, type the maximum time period in seconds for which the IP address will be allocated to the APs.
    4. In the DNS Servers box, type the DNS Server‘s IP address if you have a DNS Server.
    5. In the WINS box, type the WINS Server‘s IP address if you have a WINS Server.
       

       Note

       You can type multiple entries in the DNS Servers and WINS boxes. Each entry must be separate by a comma. These two fields are not mandatory to enable the local DHCP feature.
    6. In the Gateway box, type the IP address of the default gateway.
       

       Note

       Since the controller is not allowed to be the gateway for the segment, including APs, you cannot use the Interface IP address as the gateway address for physical and Bridged at Controller topology. For Routed topology, the controller IP address must be the gateway.
    7. Configure the address range from which the local DHCP Server will allocate IP addresses to the APs.
       • In the Address Range: from box, type the starting IP address of the IP address range.
       • In the Address Range: to box, type the ending IP address of the IP address range.
    8. Click the Exclusion(s) button to exclude IP addresses from allocation by the DHCP Server. The DHCP Address Exclusion window opens.

    The controller automatically adds the IP addresses of the Interfaces (Ports), and the default gateway to the exclusion list. You cannot remove these IP addresses from the exclusion list.

    

    
    • Select Range. In the From box, type the starting IP address of the IP address range that you want to exclude from the DHCP allocation.
    • In the To box, type the ending IP address of the IP address range that you want to exclude from the DHCP allocation.
    • To exclude a single address, select the Single Address radio button and type the IP address in the adjacent box.
    • In the Comment box, type any relevant comment. For example, you can type the reason for which a certain IP address is excluded from the DHCP allocation.
    • Click Add. The excluded IP addresses are displayed in the IP Address(es) to exclude from DHCP Address Range box.
    • To delete a IP Address from the exclusion list, select it in the IP Address(es) to exclude from DHCP Range box, and then click Delete.
    • To save your changes, click OK.
    1. Click Close to close the DHCP configuration window.
       

       Note

       The Broadcast (B‘cast) Address field is view only. This field is computed from the mask and the IP addresses.
12. You are returned to the L2 port topology edit window.