Link Aggregation
Link aggregation allows data traffic across both Ethernet ports on AP resulting in increased throughput and redundancy. You can configure LACP only on the second interface of the AP. Before you configure LACP on the second interface of the AP, enable bonding on the switch that terminates AP. When configured for link aggregation, the second interface of the AP will inherit all properties of the first interface. When enabled, LACP is functional on both ports.
The second interface of the AP is disabled by default and when enabled it functions as the bonded pair to the first interface. The second interface cannot be used in standalone mode. However, when LACP is enabled and if one of the interfaces fails, the second interface takes over and passes traffic. During a failover, the second interface will function only if there is an external power supply or if the switch can provide only power via PoE.
Link aggregation is available only on AP832, AP822, FAP-U421, and FAP-U423. If the switch that terminates the AP does not support LACP, the AP will fall back to non-LACP mode with only one interface passing data traffic. Static bonding is not supported.
Pre-requisites
Before you enable LACP on the AP, ensure that you do the following
- Remove port AP entry from the port profile of that AP.
- Enable LACP support for the ports on the switch that terminates the AP.
- AP requires 802.3at power to support LACP.
NOTE: If the switch does not support LACP, the AP will work in non-LACP mode.
Link Aggregation
Enabling LACP in CLI
Use the lacp enable command on an AP’s ethernet interface to enable LACP.
controller(15)# config terminal controller(15)(config)# interface ap 108 2 controller(15)(config‐if‐WiredEth)# lacp enable
Verifying LACP Status
The Uplink Type and LACP column in the show interfaces ap <ap-id> command displays the status of LACP for an AP.
Controller(15)# show interfaces Ethernet ap 108
Type ID Name IfIndex MTU MAC Address Admin State Op State Last Change Uplink Type LACP
ap 108 AP‐108 1 1500 00:0c:e6:13:01:a9 Up Disabled 05/19/2014 20:05:12 Uplink disable
ap 108 AP‐108 2 1500 00:0c:e6:13:01:a9 Up Disabled 05/20/2014 23:51:48 Uplink‐lacp enable
Ethernet Table(2 entries)
For additional diagnostics, you can view the Tx and Rx errors of AP interface using the show interfaces Ethernet statistics <ap-ID> command.
Controller(15)# show interfaces Ethernet statistics ap 13
IfIndex Node ID Node Name Type In Octets In Errors Out Octets Out Errors
- 13 AP‐13 ap 78217745 0 4637677 0
- 13 AP‐13 ap 0 0 0 0
LACP 13 AP‐13 ap 78217745 0 4638109 0
Ethernet Statistics(3 entries)
Enabling LACP in WebUI
- Goto Configuration > Devices > AP, select the AP.
Link Aggregation
- Goto Ethernet Interface tab, and select the second Ethernet Interface and set LACP to Enable.
To batch enable LACP on multiple APs.
- Goto Configuration > Wired > Ethernet, select all APs and click the Bulk Update button.
- Set LACP to Enable.