Can I modify the speed/duplex settings in a Gigabit port on an M3?

Aruba Employee
Aruba Employee

Product and Software: This article applies to Multi-Service Mobility Modules (M3) running ArubaOS and later.


When the Gigabit Ethernet GE port of certain vendor's L3 switch is connected to the Gigabit Ethernet GE port of the Aruba M3 controller set to autoneg, the link between the L3 switch and controller does not come up.


To bring up the link, you must hardcode speed/duplex to 1000Mbps/Full on Aruba or the peer.


However, before ArubaOS, it was not possible to change the speed/duplex settings on the ports of an M3.


When you try to make changes to the speed/duplex settings on the GE port, it gives the following error:


(config) #interface gigabitethernet 0/1
(config-if)#speed 1000
Speed configuration not supported

(config-if)#duplex full
Duplex configuration not supported

This issue has been fixed in Aruba OS and later builds.


(ArubaM3) (config) #interface gigabitethernet 0/8
(ArubaM3) (config-if)#speed 1000
(ArubaM3) (config-if)#shutdown
(ArubaM3) (config-if)#no shutdown
(ArubaM3) (config-if)#show interface gigabitethernet 0/8

GE 0/8 is up, line protocol is up
Hardware is Gigabit Ethernet, address is 00:0B:86:03:D5:09 (bia 00:0B:86:03:D5:09)
Description: GE0/8
Encapsulation ARPA, loopback not set
Configured: Duplex (Full), speed (1000 Mbps)
MTU 1500 bytes, BW is 1000 Mbit
Last clearing of "show interface" counters 0 day 0 hr 3 min 6 sec
link status last changed 0 day 0 hr 0 min 1 sec
25 packets input, 2108 bytes
Received 25 broadcasts, 0 runts, 0 giants, 0 throttles
0 input error bytes, 0 CRC, 0 frame
25 multicast, 0 unicast
50 packets output, 3200 bytes
0 output errors bytes, 0 deferred
0 collisions, 0 late collisions, 0 throttles
This port is TRUSTED

Version history
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2 of 2
Last update:
‎06-30-2014 05:45 PM
Updated by:
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