Configuring LAG for the AP

Configuring LAG(link aggregation) allows the AP to provide 2 Gbps uplink.

Configuring WLC

1. Use the command “config ap lag-mode support enable” to enable global LAG support. This will cause the DTLS connection to be down.
2. Use the command “config ap lag lag-mode support enable <ap name>” to enable LAG support for the AP. This will cause the AP to reboot. This command has the same effect as executing “capwap ap lag enable” on the AP.

(Cisco Controller) >config ap lag-mode support enable 

Warning! DTLS connection with all APs will be teared down causing
 them to disjoin and rejoin again. 
 Are you sure you want to continue? (y/n) y


Warning: AP behind NAT/PAT will not be supported.

(Cisco Controller) >config ap lag-mode support enable AP38

Warning! AP will be rebooted. 
 Are you sure you want to continue? (y/n) y

Configuring the switch

I used LACP, but we can also use ON mode.

Switch(config)#port-channel load-balance src-dst-port
Switch(config)#int range gigabitEthernet 1/0/3, gigabitEthernet 1/0/5
Switch(config-if-range)#channel-group 1 mode active


Switch#sh run int port-channel 1
Building configuration...

Current configuration : 125 bytes
!
interface Port-channel1
 switchport trunk native vlan 69
 switchport trunk allowed vlan 1-3000
 switchport mode trunk
end

Verification

Switch#show etherchannel summary 
Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1      Po1(SU)         LACP      Gi1/0/3(P)  Gi1/0/5(P)  

Switch#
Switch#show interfaces gigabitEthernet 1/0/5 counters 

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts 
Gi1/0/5          1261761          10609              6              2 

Port           OutOctets   OutUcastPkts   OutMcastPkts   OutBcastPkts 
Gi1/0/5          1260384          10587             94             65 
Switch#show interfaces gigabitEthernet 1/0/3 counters 

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts 
Gi1/0/3            11558             35              6              0 

Port           OutOctets   OutUcastPkts   OutMcastPkts   OutBcastPkts 
Gi1/0/3            10295             60             18             22 
Switch#