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adirinaldi
Beginner

Etherchannel issue on 6500 (err-disable)

Hi,

Currently I'm working on 2 6500 (let say, C6506 & C6509) and try to configure etherchannel between those two.

C6506 is using WS-X6724-SFP, connecting to C6509 via WS-X6816-GBIC.

If there is only 1 cable on the bundle, the port-channel is up and working properly. But when the second or third cable is join the bundle, the C6506 will generate error message:

PM-4-ERR_DISABLE: Channel-misconfig error detected on [chars], putting [chars] in err-disable state.

And the interface will went into "down" state.

I have checked both switches for misconfig, but can't found any.

The configuration is as follow:

interface <interface-id>

Switchport

Switchport trunk encapsulation dot1q

Switchport mode trunk

channel-group 1 mode on

interface port-channel 1

Switchport

Switchport trunk encapsulation dot1q

Switchport mode trunk

C6509 running native IOS 12.1(13)E6.

C6506 running native IOS 12.2(18)SXE6.

I tried different combination on both switches, ON/ON, ACTIVE/PASSIVE, DESIRABLE/AUTO. Nothing worked.

The last thing is instead of connecting to C6509/WS-X6816-GBIC, I'm using GBIC on Supervisor (same switch, WS-X6K-S2U-MSFC2) and it worked. But the thing is using Supervisor GBIC I can only achieve max 2GB on the bundle.

Please help me solving this, and Thanks.

7 REPLIES 7
s.arunkumar
Participant

Hi Arun,

I have check all the necessary conditions for etherchannel, and everything are met.

But one thing, I haven't try is to hardcode duplex setting on both interfaces, currently they are running default duplex setting. I'm afraid that the default duplex setting between 6816-GBIC & SFP is different.

Adi

yjdabear
Collaborator

Check using "show monitor" to make sure none of the ports in the Etherchannel is not a member of any SPAN session.

Hi Yi,

I have issue the show monitor before and none of the ports are member of SPAN.

Adi

glen.grant
Advisor

Take them down and then bring them all up at the same time with the interface range command and see what happens or do a shut on the int portchannel 1 interface and then do a no shut .

Hi Glen,

Yes, i have tried to shut/no shut the interface at the same time none of them worked, I suspect that the default duplex setting between line cards is different, I'm going to try hardcode the duplex setting.

Adi

Konstantin Dunaev
Enthusiast

could you post here the configuration of all 4 ports and the exactly syslog messages which you see?

the most usual problem is the different VLAN list or differnt native VLAN.

if you suspect the speed/dupley mistmatch then try to configure them manually.