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New Member

Stack of 2 switches connected with single cable

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

3 ACCEPTED SOLUTIONS

Accepted Solutions
VIP Super Bronze

Re: Stack of 2 switches connected with single cable

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

Hall of Fame Super Gold

Stack of 2 switches connected with single cable

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.

Hall of Fame Super Gold

Stack of 2 switches connected with single cable

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.

10 REPLIES
VIP Super Bronze

Re: Stack of 2 switches connected with single cable

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

New Member

Stack of 2 switches connected with single cable

Hi Reza,

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

Best regards

Mahesh

VIP Super Bronze

Re: Stack of 2 switches connected with single cable

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

Hall of Fame Super Gold

Stack of 2 switches connected with single cable

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.

New Member

Stack of 2 switches connected with single cable

Hi Leo,

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

Regards

Mahesh

Hall of Fame Super Gold

Stack of 2 switches connected with single cable

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.

New Member

Stack of 2 switches connected with single cable

Hi Leo,

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

Regards

Mahesh

Hall of Fame Super Gold

Stack of 2 switches connected with single cable

Thanks for taking the time to rate our posts. 

VIP Super Bronze

Stack of 2 switches connected with single cable

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

Super Bronze

Re: Stack of 2 switches connected with single cable

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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.

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