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3935i LACP with same switch possible ?

Userlevel 2
We are using 3935i APs

They are connected to only one port : I saw the LOW mode in the log

We would like to use it with performance: we have to use TWO ethernet ports

Is it possible with only one POE switch X440-48P


7 replies

Userlevel 3
Hi Pascal,

I dont think we can connect both LAN ports on the same switch. Please check the below article for more information:



Userlevel 3
Hi Pascal,

If the Ethernet ports of the AP are connected to separate switches in a stack, then the switches in the stack can provide both POE and LAG functionality simultaneously to the AP.

Userlevel 7
In case the KB article is correct and also is valid for the AP3935i then just turn PoE off on one switch port and configure the LAG and that should work.
Userlevel 2
And If the customer have only one switch ...
Can we use an injector on the second port ? (strange ... but how can we have the Full power mode with one switch) ?
Userlevel 7
The switch could support 802.3at so you should be able to get full power from one port.
A think you run into the same issue as I did with another switch model - please take a look...

Userlevel 4
Actually, I tested this both with AP3825i and AP3935i few month ago.
It worked okay with AP3935i while AP3825i didn't as the above article.
AP3935i should be removed from the article I think.
I will check again and let you know later.
Userlevel 4

Based on my lab, it is working fine with 3935i as below information.
I will ask the article creator to change details.
And please notice that I used fallback feature of LACP to ensure connection when AP is not set to use LACP so that you can change setting of the AP after all.

AP info

Switch info

* X440G2-12p-10G4.7 # show sharing
Load Sharing Monitor
Config Current Agg Min Ld Share Dist Ld Share Agg Link Link Up
Master Master Control Active Algorithm Flags Group Mbr State Transitions
1 1 LACP 1 L2 A 1 Y A 13
L2 2 Y A 10
Link State: A-Active, D-Disabled, R-Ready, NP-Port not present, L-Loopback
Minimum Active: (<) Group is down. # active links less than configured minimum
Load Sharing Algorithm: (L2) Layer 2 address based, (L3) Layer 3 address based
(L3_L4) Layer 3 address and Layer 4 port based
Distribution Flags:
A - All: Distribute to all members,
L - Local Slot: Distribute to members local to ingress slot,
P - Port Lists: Distribute to per-slot configurable subset of members,
R - Resilient Hashing enabled.
Number of load sharing trunks: 1
* X440G2-12p-10G4.8 # show lacp lag 1

Lag Actor Actor Partner Partner Partner Agg Actor
Sys-Pri Key MAC Sys-Pri Key Count MAC
1 0 0x03e9 d8:84:66:57:cf:3b 65535 0x0011 2 00:04:96:9b:54:26

Port list:

Member Port Rx Sel Mux Actor Partner
Port Priority State Logic State Flags Port
1 0 Current Selected Collect-Dist A-GSCD-- 1
2 0 Current Selected Collect-Dist A-GSCD-- 2
Actor Flags: A-Activity, T-Timeout, G-Aggregation, S-Synchronization
C-Collecting, D-Distributing, F-Defaulted, E-Expired

* X440G2-12p-10G4.9 # show inline-power info ports 1,2

Port State Class Volts Curr Power Fault
(mA) (Watts)
1 delivering class4 54.0 15 0.800 None
2 delivering class4 54.2 145 7.800 None

* X440G2-12p-10G4.10 #

Thank you.