Master Election Protocol; Preference To An Iap With 3G/4G Card; Preference To An Iap With Non-Default Ip; Manual Provisioning Of Master Iap - Aruba IAP-335 User Manual

The VC also functions like any other IAP with full RF scalability. It also acts as a node, coordinating DHCP
address allocation for network address translated clients ensuring mobility of the clients when they roam
between different IAPs.

Master Election Protocol

The Master Election Protocol enables the Instant network to dynamically elect an IAP to take on a VC role and
allow graceful failover to a new VC when the existing VC is not available. This protocol ensures stability of the
network during initial startup or when the VC goes down by allowing only one IAP to self-elect as a VC.

Preference to an IAP with 3G/4G Card

The Master Election Protocol prefers the IAP with a 3G/4G card when electing a VC for the Instant network
during the initial setup.
The VC is selected based on the following criteria:
If there is more than one IAP with 3G/4G cards, one of these IAPs is dynamically elected as the VC.
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When an IAP without 3G/4G card is elected as the VC but is up for less than 5 minutes, another IAP with
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3G/4G card in the network is elected as the VC to replace it and the previous VC reboots.
When an IAP without 3G/4G card is already elected as the VC and is up for more than 5 minutes, the VC will
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not be replaced until it goes down.
IAP-135 is preferred over IAP-105 when a VC is elected.

Preference to an IAP with Non-Default IP

The Master Election Protocol prefers an IAP with non-default IP when electing a VC for the Instant network
during initial startup. If there are more than one IAPs with non-default IPs in the network, all IAPs with default
IP will automatically reboot and the DHCP process is used to assign new IP addresses.
Viewing Master Election Details
To verify the status of an IAP and master election details, execute the following commands:
(Instant AP)# show election statistics
(Instant AP)# show summary support

Manual Provisioning of Master IAP

In most cases, the master election process automatically determines the best IAP that can perform the role of
VC, which will apply its image and configuration to all other IAPs in the same IAP management VLAN. When the
VC goes down, a new VC is elected.
Provisioning an IAP as a Master IAP
You can provision an IAP as a master IAP by using the Instant UI or the CLI.
In the Instant UI
To provision an IAP as a master IAP:
1. On the Access Points tab, click the IAP to modify.
2. Click the edit link.
3. Select Enabled from the Preferred master drop-down list. This option is disabled by default.
Aruba Instant 6.5.0.0-4.3.0.0 | User Guide Customizing IAP Settings | 74