3750-E 10G interfaces - verification

[roger perkin]

Can anyone advise how the operation of the 10G modules work in a 3750-X?

I have a stack of 2 switches with a network module in each? 

Firstly how do I check what network module there is installed? 

Secondly what is the operation? 

I know you can only have 2 interfaces that run 10G this is the output 

Gi1/1/1                      disabled     1            auto   auto Not Present

Gi1/1/2                      disabled     1            auto   auto Not Present

Gi1/1/3                      notconnect   1            auto   auto Not Present

Gi1/1/4                      notconnect   1            auto   auto Not Present

Te1/1/1   *********** connected    trunk        full    10G SFP-10GBase-SR

Te1/1/2   *********** connected    trunk        full    10G SFP-10GBase-SR

Gi2/1/1                    disabled     1            auto   auto Not Present

Gi2/1/2                    disabled     1            auto   auto Not Present

Gi2/1/3                      disabled     1            auto   auto Not Present

Gi2/1/4                     disabled     1            auto   auto Not Present

Thanks

[willwetherman · Accepted solution]

Hi Roger,

You can check which module is installed by using 'show inventory'

From the interface output below it would appear that you have a C3KX-NM-10G installed which provides 2 x SFP+ interfaces and 2 x regular SFP interfaces. The SFP+ interfaces support both 10GbE and 1 GbE hence the output of 4 x 1GbE interfaces and 2 x 10GbE interfaces. I believe that you can use the following interface combinations

2 x 10GbE and no 1GbE

4 x 1GbE and no 10GbE

1 x 10GbE and 2 x 1GbE

I hope that this helps

Will

[roger perkin]

Thanks Will 

And the 10g ports are port 2 & 4 on the Module? 

Will they just show up at TE1/1/1 and TE1/1/2 if there is an SFP in the interface?

[willwetherman]

Hi Roger,

Yes, ports 2 and 4 on the module are SFP+

I believe that the ports will show up int the configuration/show interfaces as Te1/1/1 and Te1/1/2 regardless if an SFP/SFP+ module is connected or not.

The below is from the Cisco 3750-X Network Module installation notes which provides more detail on the operation of the ports:

The four slots are grouped as two pairs, with each pair consisting of one SFP slot and one SFP+ slot. Each pair supports either two 1-Gigabit SFP modules or one 10-Gigabit SFP+ module. A 10-Gigabit SFP+ module cannot operate at the same time as the corresponding 1-Gigabit SFP module in the pair.

Supported combinations of SFP and SFP+ modules:

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

•
Slots 1 and 2 with 1-Gigabit SFP modules and Slot 4 with one 10-Gigabit SFP+ module

•
Slot 2 with one 10-Gigabit SFP+ module and Slots 3 and 4 with 1-Gigabit SFP modules

•
Slot 2 and Slot 4 each with 10-Gigabit SFP+ modules

A 10-Gigabit SFP+ module takes precedence over a 1-Gigabit SFP module except when an SFP module is first inserted in Slot 1 and has link. When you insert an SFP+ module in Slot 2, the SFP in Slot 1 retains link. The SFP+ module in Slot 2 does not operate.

When the SFP module in Slot 1 is shutdown, loses link, or is removed, the SFP+ module in Slot 2 turns on. The SFP module in Slot 1 does not work as long as an SFP+ module is in Slot 2, whether it has link up or not.

Will