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3850: Understanding interface configuration on NM modules

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Introduction

It is sometimes confusing on which interfaces are available and which can be configured when using one of the NM modules in a Cisco 3850 Switch.  We currently offer three different modules:

  • C3850-NM-4-1G (four 1-Gigabit SFP module slots)
  • C3850-NM-2-10G (Combination of 1-Gig and 10-Gig ports)
  • C3850-NM-4-10G (four 10-Gigabit slots or four 1-Gigabit slots)

The available configuration is based on which model NM you are using.  The intent of this document is to help clear up some of the misunderstood configuration options.  Below are details on each NM module and how to configure each one when inserted into the switch.

 

344199.jpg

 

C3850-NM-4-1G

This module has four 1-Gigabit SFP module slots. Any combination of standard SFP modules are supported. SFP+ modules are not supported.  If you insert an SFP+ module in the 1-Gigabit network module, the SFP+ module does not operate, and the switch logs an error message.

C3850-NM-2-10G

This module has four slots that support the following combinations:

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.

Three slots (left side) support 1-Gigabit SFP modules and one slot (right side) supports 10-Gigabit Ethernet SFP+.

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 4 populated with one 10-Gigabit SFP+ module.

Slot 3 and Slot 4 each populated with 10-Gigabit SFP+ modules.

C3850-NM-4-10G

This module has four 10-Gigabit slots or four 1-Gigabit slots.

Note This is only supported on the 48-port models.

Configuration

For the C3850-NM-4-1G module - All ports are natively Gig and are configured as Gig1/1/1 through Gig1/1/4

<snippet>

interface GigabitEthernet1/1/1 <-------- Config this interface
!
interface GigabitEthernet1/1/2 <-------- Config this interface
!
interface GigabitEthernet1/1/3 <-------- Config this interface
!
interface GigabitEthernet1/1/4 <-------- Config this interface
!
interface TenGigabitEthernet1/1/1 <-------- Disregard
!
interface TenGigabitEthernet1/1/2 <-------- Disregard
!
interface TenGigabitEthernet1/1/3 <-------- Disregard
!
interface TenGigabitEthernet1/1/4 <-------- Disregard

For the C3850-NM-4-10G module - All ports default to 10G and should be configured as
TenGig1/1/1 through TenGig1/1/4 - even though you are operating them as 1G via SFPs.

<snippet>

interface GigabitEthernet1/1/1 <-------- Disregard
!
interface GigabitEthernet1/1/2 <-------- Disregard
!
interface GigabitEthernet1/1/3 <-------- Disregard
!
interface GigabitEthernet1/1/4 <-------- Disregard
!
interface TenGigabitEthernet1/1/1 <-------- Config this interface
!
interface TenGigabitEthernet1/1/2 <-------- Config this interface
!
interface TenGigabitEthernet1/1/3 <-------- Config this interface
!
interface TenGigabitEthernet1/1/4 <-------- Config this interface

For the C3850-NM-2-10G module - The first two ports are natively 1G ports and the last two ports
are natively 10G ports. So you configure the 1Gig ports as Gig1/1/1 through Gig1/1/2, and configure the
last two ports as TenGig1/1/3 through TenGig1/1/4 - even if you are operating the last two ports as 1G.

## This is commonly misunderstood ##

<snippet>

interface GigabitEthernet1/1/1 <-------- Config this interface
!
interface GigabitEthernet1/1/2 <-------- Config this interface
!
interface GigabitEthernet1/1/3 <-------- Disregard
!
interface GigabitEthernet1/1/4 <-------- Disregard
!
interface TenGigabitEthernet1/1/1 <-------- Disregard
!
interface TenGigabitEthernet1/1/2 <-------- Disregard
!
interface TenGigabitEthernet1/1/3 <-------- Config this interface even if using 1G
!
interface TenGigabitEthernet1/1/4 <-------- Config this interface even if using 1G

** There are only 4 interfaces which are valid and the other 4 should not be used even though they still show up in the CLI

Supported GBICs

TenGig

  • SFP-H10GB-CU1M
  • SFP-H10GB-CU3M
  • SFP-H10GB-CU5M
  • SFP-10G-SR
  • SFP-10G-LRM
  • SFP-10G-LR
  • SFP-10G-ER

OneGig

  • GLC-T (10/100/1000)
  • GLC-SX-MM
  • GLC-LH-SM
  • GLC-SX-MMD
  • GLC-LH-SMD
  • GLC-ZX-SM
  • GLC-ZX-SMD
  • GLC-BX-D
  • GLC-BX-U
  • CWDM SFP
  • SFP-GE-S
  • SFP-GE-L
  • SFP-GE-Z
  • DWDM SFP
  • DWDM SFP (add.)

Reference

  • Installing a Network Module

http://www.cisco.com/en/US/docs/switches/lan/catalyst3850/hardware/installation/guide/HIGNM.html#wp1053282

  • 10-Gigabit Ethernet Transceiver Modules Compatibility Matrix

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6974.html

  • Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#wp166237

Comments
Beginner

Great doc!!

 

the network module for the 3850's:  are these hot swappable?  i want to remove it during production and then maybe one day add it back on during production.  I don't want to reload the switch; is this possible?

Hall of Fame Master

Better to pose a question as a new thread but - yes - they are hot-swappable.

Beginner

Thanks Marv!

Contributor

thank you

 

i though that all new interface were going to drop the speed in the name

ie all will be Eth /1/2/3

this started in some product to make interface consistant.and also align with Juniper methodology

 

cherrs

Hi all,

I'm a little confused about the C3850-NM-2-10G.

under the supported combinations I see the following:
1G - 1G -1G -1G

1G - 1G - empty - 10G

empty - empty - 10G - 10G

I'm missing the following option: 1G - 1G -10G -10G

Does this mean it is not supported?

 

 

Community Member

Can i install the 1G module in 10 slot.

Can i connect my 3750 e 1g sfp port with the 3850 10 SFP port
 

Contributor

To clarify

Cisco is moving to a new naming schema

OLD: eth 0/1 , Fe 0/1, GI, 0/1 and TenGigabitEthernet1/1/1

NEW: eth 0/1 for all interfaces regardless of speed

 

some products limit mix and matching

Beginner

Hi, I am a bit confused here. Regarding the part where it is written 

C3850-NM-2-10G
This module has four slots that support the following combinations:
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.
Three slots (left side) support 1-Gigabit SFP modules and one slot (right side) supports 10-Gigabit Ethernet SFP+.
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 4 populated with one 10-Gigabit SFP+ module.
Slot 3 and Slot 4 each populated with 10-Gigabit SFP+ modules.
 
1st, it let understand that we can install at the same time two 1Gbps and two 10Gbps interfaces. 
2nd, that we can combine three 1Gbps and one 10Gbps interfaces.
3rd, four 1Gbps, so every 10Gbps port can do 1Gbps.
4th, that where I get lost, they are saying that we can install two 1Gbps and one 10Gbps interface? Is that not the 1st or 2nd senario without the interface T1/1/3 disregarding what speed the interface is?
5th, at last, is't not the 1st senario one without any 1Gbps interface?
 
Am I missing something here or do we realy need to tell people that they do not need to fill the whole network module to make it functionnal?
 
What if I want to install only one 1Gbs interface instead of two in the first senario?
 
Is there a boggie man for the network designers who bites the one who install a 10Gbps SFP module into the T1/1/3 slot without filling T1/1/4 slot first?
 
Tell me if there is a real reason why the two last combination need to be specified here or if I can use any combination as long that the SFP technology match the port where I install it?
 
Logicaly, if I can use the 2x1Gbps + 2x10Gbps combination and replace the 10Gbps by 1Gbps interface, I must be able to do any combination possible?
 
Now let change the question in the oposit dirrection, is there any combination that I CAN'T do with that network module always keeping in mind that we must use compatible interface?
 
I may asking myself too much questions, but I did understand something in networking : details are always importants, and I feel like I miss that kind of details here. 
 
Thanks guys for your help, have a nice day
Community Member

I have exactly the same question as bramvdbosch

By looking at the install guide it looks like it is possible to have 1G - 1G -10G -10G, unless we are missing something?

The first two ports are natively 1-G ports and the last two ports are natively 10-G ports. So, you configure the 1-G posts as GigabitEthernet1/1/1 through GigabitEthernet1/1/2, and configure the last two ports as TenGigabitEthernet1/1/3 through TenGigabitEthernet1/1/4, even when you are operating the last two ports as 1-G. Only four interfaces are valid, and the other four should not be used even though they still show up in the CLI.

Table 3 C3850-NM-2-10G Module
InterfaceAction

GigabitEthernet1/1/1

Configure this interface

GigabitEthernet1/1/2

Configure this interface

GigabitEthernet1/1/3

Disregard

GigabitEthernet1/1/4

Disregard

TenGigabitEthernet1/1/1

Disregard

TenGigabitEthernet1/1/2

Disregard

TenGigabitEthernet1/1/3

Configure this interface, even when operating as 1-G

TenGigabitEthernet1/1/4

Configure this interface, even when operating as 1-G

Beginner

got the same question here! did anyone tried this combo? 1g+1g+10g+10g? Even 1g+empty+10g+10g will be enough for me

Beginner

ok, guys! Lets hope this helps.

 

I have a C3850-NM-2-10G module in the switch.

Switch#sh inv
NAME: "c38xx Stack", DESCR: "c38xx Stack"
PID: WS-C3850-24U      , VID: V03  , SN: FCW1929C1UQ

NAME: "Switch 1", DESCR: "WS-C3850-24U-S"
PID: WS-C3850-24U-S    , VID: V03  , SN: FCW1929C1UQ

NAME: "Switch 1 - Power Supply B", DESCR: "Switch 1 - Power Supply B"
PID: PWR-C1-1100WAC    , VID: V01  , SN: DTN1921V49T

NAME: "Switch 1 FRU Uplink Module 1", DESCR: "2x1G 2x10G Uplink Module"
PID: C3850-NM-2-10G    , VID: V01  , SN: FOC19261BXS

NAME: "Gi1/1/1", DESCR: "1000BaseSX SFP"
PID:                    , VID:      , SN: FNS13020R6X 

NAME: "Gi1/1/2", DESCR: "1000BaseSX SFP"
PID:                    , VID:      , SN: FNS134301H0 

NAME: "Te1/1/3", DESCR: "1000BaseSX SFP"
PID: GLC-SX-MMD         , VID: V01  , SN: FNS1753026X 

NAME: "Te1/1/4", DESCR: "1000BaseSX SFP"
PID:                    , VID:      , SN: FNS13020R6P

 

 

Case-1)When there is no transceiver in the module:

It shows them as

GigabitEthernet1/1/1   unassigned      YES unset  down                  down   
GigabitEthernet1/1/2   unassigned      YES unset  down                  down   
GigabitEthernet1/1/3   unassigned      YES unset  down                  down   
GigabitEthernet1/1/4   unassigned      YES unset  down                  down   
Te1/1/1                unassigned      YES unset  down                  down   
Te1/1/2                unassigned      YES unset  down                  down   
Te1/1/3                unassigned      YES unset  down                  down   
Te1/1/4                unassigned      YES unset  down                  down

 

Case-2: When I inserted two 1-gig SFPs on the two left and two 10-gig on the two right ports:

Gi1/1/1                      notconnect   1            full   1000 1000BaseSX SFP
Gi1/1/2                      notconnect   1            full   1000 1000BaseSX SFP
Te1/1/3                      notconnect   1            full    10G SFP-10GBase-SR
Te1/1/4                      notconnect   1            full    10G SFP-10GBase-SR

Notice: Gig 1/1/3 and Gi1/1/4 have disappeared as well as Te1/1/1 and Te1/1/2.

 

Case-3: Now I replaced SFP-10GBase-SR in port-3 with a 1000BaseSX SFP. See what happened:

*Oct 22 10:48:54.528: %PLATFORM_PM-6-MODULE_REMOVED: SFP module with interface name Te1/1/3 removed
*Oct 22 10:48:59.634: %PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module with interface name Te1/1/3 is not supported
*Oct 22 10:48:59.634: %PM-4-ERR_DISABLE: gbic-invalid error detected on Te1/1/3, putting Te1/1/3 in err-disable state

Then I tried resetting the port, just to see, will the 3rd port ever work for 1-gig.


Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int ten1/1/3
Switch(config-if)#shut
Switch(config-if)#no shut
Switch(config-if)#end
Switch#
*Oct 22 10:49:31.777: %SYS-5-CONFIG_I: Configured from console by console
*Oct 22 10:49:32.022: %PLATFORM_PM-6-MODULE_INSERTED: SFP module inserted with interface name Te1/1/3
Switch#
Switch#sh int status

Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/1                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/2                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/3                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/4                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/5                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/6                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/7                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/8                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/9                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/10                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/11                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/12                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/13                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/14                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/15                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/16                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/17                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/18                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/19                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/20                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/21                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/22                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/23                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/24                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/1/1                      notconnect   1            full   1000 1000BaseSX SFP
Gi1/1/2                      notconnect   1            full   1000 1000BaseSX SFP
Te1/1/3                      notconnect   1            full   1000 1000BaseSX SFP
Te1/1/4                      notconnect   1            full    10G SFP-10GBase-SR

 

Notice above that after shut/.no-shut on port Te1/1/3, it is ready for connection but the interface naming stayed to be Te1/1/3 and did not change to a Gi1/1/# format even though the transceiver in the port is a gig-SFP.

Case-4: Finally, I replaced the last 10-gig with a gig too and this time, port didn't even err-disabled.
*Oct 22 10:58:00.558: %PLATFORM_PM-6-MODULE_REMOVED: SFP module with interface name Te1/1/4 removed
*Oct 22 10:58:11.438: %PLATFORM_PM-6-MODULE_INSERTED: SFP module inserted with interface name Te1/1/4
Switch#
Switch#sh int status

Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/1                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/2                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/3                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/4                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/5                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/6                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/7                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/8                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/9                      notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/10                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/11                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/12                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/13                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/14                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/15                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/16                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/17                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/18                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/19                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/20                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/21                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/22                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/23                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/0/24                     notconnect   1            auto   auto 10/100/1000BaseTX
Gi1/1/1                      notconnect   1            full   1000 1000BaseSX SFP
Gi1/1/2                      notconnect   1            full   1000 1000BaseSX SFP
Te1/1/3                      notconnect   1            full   1000 1000BaseSX SFP
Te1/1/4                      notconnect   1            full   1000 1000BaseSX SFP

Notice above, now we have ALL 1-gig SFPs but the port naming stayed the same. It makes sense. If the interface naming changes as soon as you replace a transceiver then your config gets nullified. Cisco did what made sense that once the switch boots up and intial config is deployed on the uplink module, then the interface naming doesnt change on changing the transceivers.

 

Hope this post has cleared all doubts. I was myself curious and wanted to find an online answer but upon seeing this confusion, decided to take time and help everyone like this community has helped me zillion times in the past.

 

Thanks everyone!

Hall of Fame Master

Thank you mi975q!

An ounce of data is worth several pounds of conjecture. :)

Enthusiast

Hi Richard,

I need to know about "

Contributor

on our 3750x i allows 4 x 1Gbs or two  10Gbs

on the outside only slots 2 and 4 show up as 10 Gbs slots

they are marked TE1 and Te2

slots 1 and 3 have no TE marking

 

thus 4x 1GBS or 2x 10Gbs

Beginner

Just regarding the compatibility of the C3850-NM-4-10G module, I note from Richard's original article that only 48 port models support this network module....

"C3850-NM-4-10G

This module has four 10-Gigabit slots or four 1-Gigabit slots.

Note This is only supported on the 48-port models."

However, current Cisco documentation lists the C3850-NM-4-10G as compatible with the C3850-24XS (which I'm looking to purchase). Is this correct?

Alternatively, I'd like to use the C3850-NM-2-40G with the same switch (which I believe is compatible), but any one have a rough idea of price? I can't seem to find these modules anywhere!

Tony

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