Etherchannel Interfaces in suspend mode

[c.perez.l]

Hello!!

I configured an Etherchannel two interfaces (Gi0/37 and Gi0/39) in a CiscoWS-C2960G-48TC-L, which is connected to an HP Blade, where they spend 2vlan (16 and 17).

The point is that they got these interfaces on a trial and upload these were in sleep mode produces the following log.

Sep 1 16:04:38.649:% EC-5-CANNOT_BUNDLE2: Gi0/37 is not Compatible with Po1 and Will be suspended (trunk mode of Gi0/37 is dynamic, is Po1 trunk)

Sep 1 16:04:38.733:% EC-5-CANNOT_BUNDLE2: Gi0/39 is not Compatible with Po1

and Will be suspended (trunk mode of Gi0/39 is dynamic, is Po1 trunk

Applied to equipment configuration is as follows:

interface Port-channel1
switchport trunk allowed vlan 16,17
switchport  mode trunk
switchport nonegotiate
speed 1000
duplex  full
spanning-tree portfast trunk
!
interface  GigabitEthernet0/37
description c7000te2-vc1
switchport trunk allowed  vlan 16,17
switchport mode trunk
switchport nonegotiate
speed  1000
duplex full
channel-group 1 mode active
!
interface  GigabitEthernet0/39
description c7000te2-vc1
switchport trunk allowed  vlan 16,17
switchport mode trunk
switchport nonegotiate
speed  1000
duplex full

Any idea why interfaces are in "suspend"

regards

Atte.

César Pérez

[silvpietr]

Hi,

The command switchport nonegotiate seems to be the cause.

I have troubleshoot this today and everything was fine between a Cisco 2960 and a Palo Alto FW

HTH

Regards 

[Knowles.Darryl]

I have the same problem on my 2960x but not with SFP mines with copper

here's the error:

Sep 13 22:40:55.175: %EC-5-CANNOT_BUNDLE2: Gi1/0/47 is not compatible with Gi1/0/48 and will be suspended (speed of Gi1/0/47 is 100M, Gi1/0/48 is 1000M)

[AymanMunassar]

Under the interface 0/39 "channel-group 1 mode [active | passive]" command is not shown.

[ksalmi]

Just pay attention when doing any action on the uplink interface if you're not on site. Because you may lose control of your switch.

The best practice seems to be to do such action on site on HNO.

Any modification in terms of the physical interface impacts port channel interface.

[El Brando]

You have two "dynamic" dtp ports. Have you tried "active" on both ports instead? Two ports set to active will negotiate a trunk on their own. Dynamic and Dynamic will be passive, and only forms a trunk if it receives a trunking frame. Active Active will negotiate a trunk on its own, and will be better compatible with the member ports in the channel-group.