Stack of 2 switches connected with single cable

[mahesh18]

Hi Everyone,

We have setup where 2- 3750 switches are in stack but connected with single cable only.

sh switch stack-ring  speed

Stack Ring Speed        : 16G
Stack Ring Configuration: Half
Stack Ring Protocol     : StackWise

Need to know what we are losing apart the redundancy of using 2 cables?

Will this have impact on network performance --  like speed etc?    using single cable instead of 2 ?

Regards

Mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

You need both cables to get the entire backplane bandwidth of 32Gig full duplex.  With one cable, it is only 16Gig.

Also, as you know if you loose that cable, you loose the stack.

Thanks,

Reza

[mahesh18]

Hi Reza,

After getting all the replies here i will put second cable in.

Best regards

Mahesh

[Reza Sharifi]

Hi Mahesh,

Yes, that is a good idea, because if your have only one cable and that breaks, it can cause an outage.

Thanks,

Reza

[Leo Laohoo · Accepted solution]

Look at your "Stack Ring Speed".  See it says only 16 G?  If you use a single cable, you'll get this result.  If you use both cables, you get 32 Gbps.

[mahesh18]

Hi Leo,

So if i use both cables then traffic input and output from the switch will be more faster right?

Regards

Mahesh

[Leo Laohoo · Accepted solution]

So if i use both cables then traffic input and output from the switch will be more faster right?

Traffic BETWEEN the stack members will be twice as fast.

[mahesh18]

Hi Leo,

Many thanks i will work on to add the second cable to stack switches.

Regards

Mahesh

[Leo Laohoo]

Thanks for taking the time to rate our posts. 

[Reza Sharifi]

Leo Laohoo wrote:
Thanks for taking the time to rate our posts.  

Mahesh,

I second what Leo said.  You are always very generous with rating our posts.

Thanks again

Reza

[Joseph W. Doherty]

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Posting

Leo Laohoo wrote:
So if i use both cables then traffic input and output from the switch will be more faster right?
Traffic BETWEEN the stack members will be twice as fast. 

BTW, potentially might be good adjective unless individual flows are split between stack ports and/or you start to congest a single stack port.