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New Member

3850-24P with 2 x 10GE Network Module and 4x sfp..

Hi,

I have switch WS-C3850-24P-S with module C3850-NM-2-10G and a 4x SFP-10G-LRM.

Can I use this sfp+ module in Gi1/1/1 and Gi1/1/2 as 1 Gb/s port ? Or can i use this sfp as 1Gb/s ? I need to have 4 fiber ports, no matter  10Gb or 1 Gb/s, just 4 optic ports.

Now, i have in log:

%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/1/2, putting Gi1/1/2 in err-disable state

Thanks for any help or advice

greetings

Peter

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Silver

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

The C3850-NM-2-10G module supports 10 Gbps SFPs only in the two rightmost ports. If you need four active SFPs in that module, they must all be 1 Gbps SFPs. The hardware installation guide explains the supported combinations here.

Compatible 1 Gbps transceiver types for the 3850 are listed here.

You cannot run a 10 Gbps transceiver (such as your SFP-10G-LRM) at 1 Gbps.

Hope this helps. Please rate helpful posts.

15 REPLIES
Hall of Fame Super Silver

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

The C3850-NM-2-10G module supports 10 Gbps SFPs only in the two rightmost ports. If you need four active SFPs in that module, they must all be 1 Gbps SFPs. The hardware installation guide explains the supported combinations here.

Compatible 1 Gbps transceiver types for the 3850 are listed here.

You cannot run a 10 Gbps transceiver (such as your SFP-10G-LRM) at 1 Gbps.

Hope this helps. Please rate helpful posts.

New Member

3850-24P with 2 x 10GE Network Module and 4x sfp..

I thought that 10 Gb/s can work with 1 Gb/s speed, in Gi1/1/1 or 2 slot. Now i have to buy extra sfp just for 1 Gb/s

Thanks for explanation.

Hall of Fame Super Silver

3850-24P with 2 x 10GE Network Module and 4x sfp..

You're welcome.

Generally speaking almost all optical transceivers are limited to their rated speed (and only that speed) due to how the optical component (LED or laser) is manufactured. There are a few exceptions but they are not very common.

It's not as simple as with a 10/100/1000 copper Ethernet NIC where the multi-speed support is built into the ASIC.

Thanks for the rating.

New Member

i have similar situationi

i have similar situation

i have a 3850 with C3850-NM-4-1G

i am running ios XE 3.7

i installed GLC-SX-MMD and i get the same error

the module is only for 1gb

is it a bug? i can't find anything that says about a bug

New Member

updatei used the non Dom gbic

update

i used the non Dom gbic and worked

there must be a bug

GLC-SX-MM worked

New Member

Hello experts,

Hello experts,

We are having WS-C3850-12S-S and WS-C3850-24T-S in stack.

and am facing this same issue with my 12S-S switch i have upgraded the ios from 03.07.03E to 16.1.2 but still the problem persists ..am confused what to do now.

we are using GLC-SX-MMD= SFP modules ..what should be done in this case..

a final solution.

Cisco Employee

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

You may also want to take a look at this link as a reference.

3850: Understanding interface configuration on NM modules

https://supportforums.cisco.com/docs/DOC-36084

Lp

New Member

3850-24P with 2 x 10GE Network Module and 4x sfp..

Hi Marvin, I have a similar issue...

I have a a C3850-24P-S with a C3850-NM-2-10G, however i am using a GLC-SX-MMD.

When i insert the transceiver i get this message:

%PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module with interface name

%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/1/2, putting Gi1/1/2 in

Switch#able state

Is this transceiver support on these modules?

Am i doing something wrong?

Thanks!

Hall of Fame Super Silver

3850-24P with 2 x 10GE Network Module and 4x sfp..

The GLC-SX-MMD is supported n the C3850-NM-2-10G module as long as you don't already have 10 Gbps transceivers in the rightmost ports.

Can you share the output of:

     show int status | b Gi1/1/1

...so we can see a bit more detail?

New Member

3850-24P with 2 x 10GE Network Module and 4x sfp..

Hi Marvin, I have exactly the same problem with a C3850-NM-2-10G and GLC-SX-MMD. I've tried the GLC in two different stacks with different NM but I've received the same error. Both 3850 stacks running IOS XE 3.2.3

Do you have any ideas?

Thanks!

Francesco

New Member

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

Marvin my apologies for the delay.
Here are the results from the requested command:

Switch>show int status | b Gi1/1/1

Gi1/1/1                      err-disabled 1            auto   auto unknown

Gi1/1/2                      err-disabled 1            auto   auto unknown

Te1/1/3                      err-disabled 1            auto   auto unknown

Te1/1/4                      notconnect   1            auto   auto unknown

Switch>

When i originally inserted the transceiver i got this message:

%PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module

with interface name Gi1/1/1 is not supported

%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/1/1,

putting Gi1/1/1 in err-disable state

Please advise, thanks.

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

You should be able to do 2 X 1Gb and 1 X 10Gb in that module. Have you tried removing the 10Gb optic since it's not connected anyway? Maybe in the 2/1 configuration, the 10Gb needs to be in te1/1/3?

Hall of Fame Super Gold

3850-24P with 2 x 10GE Network Module and 4x sfp..

I believe this is an IOS bug.  Have you guys tried using OLD GLC-SX-MM (non-DOM)?

New Member

3850-24P with 2 x 10GE Network Module and 4x sfp..

Hi Leo, I've tried with GLC-SX-MM and it works correctly!

New Member

Re: 3850-24P with 2 x 10GE Network Module and 4x sfp..

Hi!

Regarding to the releasenotes of IOS XE3.3.0SE the restrictioon of C3850-NM-2-10G is incorrect:

http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst3850/software/release/3se/release_notes/OL_30562_01.html#wp338296

Network Modules

The description of the network module is incorrect. It should read:

C3850-NM-2-10G

Four-slot SFP module:

Two slots (left side) support only 1-Gigabit SFP modules and two slots (right side) support either 1-Gigabit SFP or 10-Gigabit SFP modules.

Supported combinations of SFP and SFP+ modules:

Slots 1, 2, 3, and 4 populated with 1-Gigabit SFP modules.

Slots 1 and 2 populated with 1-Gigabit SFP modules and Slot 3 and 4 populated with 10-Gigabit SFP+ module.

So it is possible to use 2 1G SFP and 2 10G SFP Modules simultaniously in the NM-2-10G.

And it works in my current setup except of a bug that disables GLC-SX-MMD= Modules when inserted.

Christian

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