no auto-negotiation on only one device on either switch?

[JustTakeTheFirstStep]

SW#sh run int g1/0/1
interface GigabitEthernet1/0/1
 switchport mode trunk
 channel-group 1 mode on

SW#sh run int g1/0/2
interface GigabitEthernet1/0/2
 switchport mode trunk
 channel-group 1 mode on

WLC#sh run int t0/1/0
interface TenGigabitEthernet0/1/0
 switchport mode trunk
 speed 1000
 no negotiation auto
 channel-group 1 mode on

WLC#sh run int t0/1/1
interface TenGigabitEthernet0/1/1
 switchport mode trunk
 speed 1000
 no negotiation auto
 channel-group 1 mode on

The WLC is hardcoded to speed 1000 and does not negotiate.

The switch to which the WLC is connected is auto-negotiating.

The problem is that sometimes the EtherChannel goes down.

I suspect this is due to the hardcoding of the WLC interface.

What do you all think?

[MHM Cisco World]

cisco recommend that both side must match 
so if your WLC is no autonego then SW interface must also no autonego

MHM

[JustTakeTheFirstStep]

I know that too. Can you provide documentation??

since the current link is normal, I need to prove the problem in order to change the config.

[MHM Cisco World]

The problem is that sometimes the EtherChannel goes down. <<- this stop me and I think that the speed not issue here 
if the Speed or duplex is mismatch then it not work at all, here as you mention it SOMETIMES goes down 

what making the PO go down ??

so let review the config, why you use mode ON ? the WLC support LACP and it protect SW and PO from L2 Loop

MHM

[JustTakeTheFirstStep]

I didn't set it up. But I'm planning to change to active mode tonight.

[MHM Cisco World]

Hi 
you comment in other post, 
and you share show of port member not the PO, 
can you share the show of interface PO 
also you can use show interface status 
MHM

[MHM Cisco World]

can you update me 
MHM

[Joseph W. Doherty]

Speed is usually not a negotiating issue, as other side can "clock" bit rate.

Duplex, though, is very much impacted by negotiating setting.

If you have a duplex mismatch, interfaces will pass traffic, by at a very slow rate due to transmission/reception errors.  If you're getting enough of these errors, possibly interface takes itself down as part of a reset.

Either switch or WLC show any log message when EtherChannel goes down?  Errors on interface stats?