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C3850-NM-4-10G went to err-disable when using 1GE SFP's


Hi together,

I have a problem with C3850-NM-4-10G module on Catalyst 3850 with 48 Ports. At the moment the switch is

running with IOS version 3.2.3.

I know that this module can pick up 1GE and 10GE SFP(+) optics in several combinations.

So that's not the problem.

If I insert any 1GE SFP to the physical ports I receive the following err-disable message:

*Nov 13 09:50:42.539: %PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module with interface name Te1/1/1 is not supported

*Nov 13 09:50:42.539: %PM-4-ERR_DISABLE: gbic-invalid error detected on Te1/1/1, putting Te1/1/1 in err-disable state

A "shut" and "no shut" helps to get the interfaces UP/UP. After the interfaces are in state UP/UP,

I see the correct SFP-type in the output of "show interface status".

IMHO it is not correct that the Ports went into err-disable state at the first time.

Right now, I am not sure, what will happen after a reboot.

Does anybody has an idea how to solve it?




Hi guys,

Re: C3850-NM-4-10G went to err-disable when using 1GE SFP's.

you may be resolved this issue to set the bandwidth on the interface and then shut or no shut the port.


Go with following commands 

switch(config-t)#int gix/x

switch(config-t)#bandwidth ................


switch(config-t)#no shutdown


switch#sh int status





So just a couple of weeks and with the kind support of the TAC some results, the delay from my last Post is caused by myself not the TAC

The SFP Bug CSCuj31712 was updated a couple of times and it is now more specific that it is a 3850 bug. It will be fixed in a future release.

After the shut / no shut everything works fine without any problems. This was confirmed by the TAC.

No further news about this topic, But in case anybody is intrested, two further 3850 issues:

The LEDs of the Network Module are flashing very quickly in the STATUS Mode even if there is almost no traffic passing. That issue is only cosmetic and was "fixed" by a documation entry:




. . .. . .

Blinking green

Activity on a link, no faults.

Note The LED will blink green even if there is very little control traffic.

. . .

. . .

The scound issue is HSRP. I noted that my LAN-BASE versions of 3850 did not offer the standby commands in version 03.03.00.

If you compare it to 3750X LAN-BASE this is a difference and asking the feature navigator it's a feature of 2960S/X too.

So I expected that it's a bug too.

I was wrong, after some research and a request to the BU the result was that it works as supposed, HSRP is not a feature included to 3850 LAN-Base. Only result I got is that a dcumentation bug was opened to document that it is not a supported feature.

I expect the same for 3650.

So if anybody else out there used 3750X-LAN-BASE for routing with HSRP and considered 3850 LAN BASE beacuse of the 4 10G-Ports (48 Port models): IT WILL NOT WORK

And according to what i heard it will not in the near future.

So maybe it's worth to consider 2960X LAN-BASE for static Routing instead of 3850 LAN-Base as there are more features for less money

Sounds crazy, doesn't it?


Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

Thanks for the Bug ID, Christian.

I have the same problem. 1000BaseSX SFP in Gi1/1/1

After boot it says in err-disabled (also after insertion). Works after shut/no shut.

Model: WS-C3850-48P-E with C3850-NM-2-10G running 03.07.02E

According to above bug, should be fixed in this version, but not the case.


use “no errdisable detect cause gbic-invalid” command


Most likely Cisco Bug: CSCuj31712 - certain Vendor SFP force ports to err-disable:



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