Controller Discovery

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:

If the provisioning parameter is set to 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. name, that name is resolved and all resulting addresses are put on the list. If it is set to an IP address, that address is put on the list.
If the provisioning parameter is not set and a managed device address was received in 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, that address is put on the list.
If the provisioning parameter is not set and no address was received via 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, 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 used to discover a managed device address and that address is put on the list.
Managed device addresses derived from the servername and serverip provisioning parameters and the default managed device name aruba-master and aruba-conductor are added to the list. Note that if 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. name resolves to multiple addresses, all addresses are added to the list.

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.

Aruba recommends that you use 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 to provide APs with the IP address of the managed device because it involves minimal changes to the network and provides the greatest flexibility in the placement of APs.

APs are factory-configured to use the aruba-master and aruba-conductor host name 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, ensure that the aruba-master and aruba-conductor entry is added to 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.

The factory-default image of APs introduced in ArubaOS 8.9.0.0 or later versions use aruba-conductor as the host name instead of aruba-master to identify a target managed device or stand-alone controller during 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. discovery. However, the factory-default image of APs that were introduced prior to ArubaOS 8.9.0.0 still use aruba-master during 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. discovery. The usage of aruba-conductor is to align with the Inclusive Language Initiative.

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 Conductor. 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:

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.
If the APs are not in the same broadcast domain as the Mobility Conductor, 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 Conductor 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 Conductor Discovery

Starting from ArubaOS 8.7.0.0, users can configure the preferred IP protocol for AP conductor discovery. The default IP protocol for AP conductor discovery is IPv4. Follow one of the following procedures 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 select IPv4 or IPv6 from the Conductor Preference drop-down list.

The following commands configure the preferred IP protocol for an AP provisioning profile.

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

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

The following commands configure the preferred IP protocol using the provision-ap command.

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

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

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