Administrator Guide

Important Points to Remember
l In the upstream direction when the AP transmits GRE frames to the controller, the bonding driver must be
in active-active mode and not in the default active-standby mode to allow link aggregation.
l The W-AP220 Series and W-AP270 Series APs detect the LACP frames and auto-configures itself to LACP
mode. If gre-striping-ip is not configured, then the AP goes back to the active-standby mode. The AP link
may go down in this scenario depending on the behavior of the upstream switch.
l Ensure that the gre-striping-ip is unique and not used by any other host on the subnet.
l LACP support is limited to a use case where Enet0 and Enet1 ports of the AP are connected to a switch, and
LACP is enabled on the two corresponding switch ports.
l The port priority is not applicable to the AP as both ports need to be used. This value is always set to the
maximum numerical priority(0xFF), which is the lowest priority.
l The system priority is not configurable. It is set to the maximum numerical value (0xFFFF), which is the
lowest priority. This leaves control of the aggregate to the upstream switch.
l The timeout value is not configurable.
l The key is not configurable and the default key value is 1.
l LACP cannot be enabled if wired AP functionality is enabled on the second port. You cannot enable LACP if
the Enet 1 port is shutdown.
Troubleshooting Link Aggregation
The following show commands in the CLI can be used to troubleshoot Link Aggregation on W-AP220 Series and
W-AP270 Series APs:
l show ap debug lacp ap-name <ap-name>—Using this command, you can view if LACP is active on an
AP. It displays the number of GRE packets sent and received on the two Ethernet ports.
l show ap database—TStarting with ArubaOS 6.4.2, the output of this command includes an LACP Striping
flag (s) to indicate of the APis configured with a LACP striping IP address,
l show datapath tunnel—Using this command, you can verify if the 2.4GHz tunnels are anchored on the
gre-striping-ip (The GRE IDs for these tunnels are in a range between 0x8300 and 0x83F0)
l show datapath user—Using this command, you can verify if the gre-striping-ip has an entry with the ‘L’
(local) flag
l show datapath route-cache—Using this command, you can verify if the gre-striping-ip has an entry
with the controller MAC.
Service Tag
A service tag is a unique seven digit alphanumeric string that is used to electronically identify a Dell device. It is
similar to a serial number identifier. Starting with ArubaOS 6.4.2.0, you can view the service tag of some newer
Dell APs from the controller WebUI or CLI. It is displayed along with the serial number in a device information
listing.
In the WebUI
To view the service tag of an AP using the WebUI:
1. Navigate to Configuration > WIRELESS > AP Installation.
2. View the service tag of an AP in the AP Service Tag column of Provisioning tab.
In the CLI
Use the following commands to view the service tag of an AP using the CLI:
Dell Networking W-Series ArubaOS 6.4.x | User Guide Access Points | 620