Discovery of Controller

An AP can discover the IP address of the controller from a DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element. server, from a DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server, or using the Aruba Discovery Protocol.

At boot time, the AP builds a list of managed device IP addresses and then tries these addresses in order until it successfully reaches a managed device. The AP constructs its list of managed device addresses as follows:

This list of IP addresses provides an enhanced redundancy scheme for managed device that are located in multiple data centers separated across Layer-3 networks.

Controller Discovery Using DNS

When using DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element., AP learns multiple IP addresses to associate with a managed device. If the primary node is unavailable or does not respond, the AP continues through the list of learned IP addresses until it establishes a connection with an available managed device. This takes approximately 3.5 minutes per managed device.

APs are factory-configured to use the host name aruba-master for the managed device that terminates the APs. For the DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element. server to resolve this host name to the IP address of the managed device, configure an entry on the DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element. server for the name aruba-master.

Controller Discovery Using Aruba Discovery Protocol

ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. is enabled by default on all Aruba APs and managed devices. With ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image., APs send out periodic multicast and broadcast queries to locate the Mobility Master. ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. requires that all APs and managed devices are connected to the same Layer-2 network. If the devices are on different networks, you must use a Layer-3 compatible discovery mechanism, such as DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element., DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network. , or IGMP Internet Group Management Protocol. Communications protocol used by hosts and adjacent routers on IP networks to establish multicast group memberships. forwarding.

To use ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. discovery:

  1. Execute the command show adp config to verify that ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. and IGMP Internet Group Management Protocol. Communications protocol used by hosts and adjacent routers on IP networks to establish multicast group memberships. join options are enabled on the managed device, If ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. is not enabled, you can re-enable ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. using the command adp discovery enable and adp igmp-join enable.
  2. If the APs are not in the same broadcast domain as the Mobility Master, you enable multicast on the network (ADP Aruba Discovery Protocol. ADP is an Aruba proprietary Layer 2 protocol. It is used by the APs to obtain the IP address of the TFTP server from which it downloads the AP boot image. multicast queries are sent to the IP multicast group address 239.0.82.11) for the Mobility Master to respond to the APs’ queries. Ensure that all routers are configured to listen for IGMP Internet Group Management Protocol. Communications protocol used by hosts and adjacent routers on IP networks to establish multicast group memberships. join requests from the controller and can route these multicast packets.

Controller Discovery Using a DHCP Server

You can configure a DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server to provide the IP address or VRRP Virtual Router Redundancy Protocol. VRRP is an election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN. IP address of the Mobility Controller. Configure the DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server to send the managed device’s IP address using the DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  vendor-specific attribute option 43. The APs identify themselves with a vendor class identifier set to ArubaAP in their DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  requests. When the DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server responds to a request, it will send the managed device’s IP address as the value of option 43.

When using DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  option 43, the AP accepts only one IP address. If the IP address of the managed device provided by DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  is not available, the AP can use the other IP addresses provisioned or learned by DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element. to establish a connection. For more information on how to configure vendor-specific information on a DHCP Dynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.  server, see “DHCP with Vendor-Specific Options” on page 1 or refer to the documentation included with your server.

Enhancements to AP Master Discovery

Starting from ArubaOS 8.7.0.0, users can configure the preferred IP protocol for AP master discovery. The default IP protocol for AP master discovery is IPv4. Follow one of the procedures below to configure the preferred IP protocol:

  • While deploying a new AP, select IPv4 or IPv6 for Controller discovery preference in the Task > AP Settings page.
  • Navigate to Configuration > Access Points. Select an AP for which you need to configure the preferred IP protocol. Under General, select IPv4 or IPv6 for Controller discovery preference.
  • Navigate to Configuration > System > Profiles > AP > Provisioning. Select a profile and selectIPv4 or IPv6 from the Master Preference drop-down list.

The following CLI Command-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. commands configure the preferred IP protocol for an AP provisioning profile:

(host) [mynode] (config) #ap provisioning-profile test

(host) [mynode] (Provisioning profile "test") #master-preference ipv6

The following CLI Command-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. commands configure the preferred IP protocol using the provision-ap command:

(host) [mynode] (config) #provision-ap

(host) [mynode] (config-submode)#master-preference ipv6

If a static IP address is already configured as the master IP address, the preferred IP protocol will not take effect.