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3750-E 10G interfaces - verification

roger perkin
Level 2
Level 2

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

 

1 Accepted Solution

Accepted Solutions

willwetherman
Spotlight
Spotlight

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

 

 

 

View solution in original post

3 Replies 3

willwetherman
Spotlight
Spotlight

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

 

 

 

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?

 

 

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