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New Member

3750 E feature for stackwise

Hi,

I'm checking the benefit of setting two 3750E in stack. Thereis a value that is not clear for me. " 64 GbpsHigh-speed stack Plus stacking"

what does this mean?

• 64-Gbps, high-speed StackWise Plus stacking

• 160-Gbps wire rate, nonblocking switching fabric capacity

regards

1 ACCEPTED SOLUTION

Accepted Solutions
New Member

3750 E feature for stackwise

hi,

this means that these switches, when you stack them, are connected via a 64Gbps connection.

the 160Gbps is the capacity of te backplane or the switch fabric which is used for switching from one port of the switch to another port on the same switch, while the 64Gbps is the "backplane" of the stack and used for switching from one port of a switch to another port of another switch of the stack.

stackwise plus is just the name how cisco calls its stacking technology.

to get the 64Gbps you have to use both connections on the backside of the switch, as one port has a bandwith of 32Gbps, but i would recommend connecting the switches as a ring anyway and so you would use both ports.

florian

3 REPLIES
New Member

3750 E feature for stackwise

hi,

this means that these switches, when you stack them, are connected via a 64Gbps connection.

the 160Gbps is the capacity of te backplane or the switch fabric which is used for switching from one port of the switch to another port on the same switch, while the 64Gbps is the "backplane" of the stack and used for switching from one port of a switch to another port of another switch of the stack.

stackwise plus is just the name how cisco calls its stacking technology.

to get the 64Gbps you have to use both connections on the backside of the switch, as one port has a bandwith of 32Gbps, but i would recommend connecting the switches as a ring anyway and so you would use both ports.

florian

New Member

Re: 3750 E feature for stackwise

Hi Florian,

Thanks a lot for your clear explanation.

5+ for you

regards

Super Bronze

Re: 3750 E feature for stackwise

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Posting

Besides the additional bandwidth the stackwise+ ring port provides (dual 16 GBps duplex), stacked 3750s become logically one device which provides some redundancy features too.  For example, you can define a Etherchannel using ports from multiple stack members and you get some NSF features.  (Failure of a non-master stack member is like a chassis line card failure, failure of the stack master member is like chassis supervisor card failure.)

PS:

The 3750X series, when stacked, is also able to share power.  Otherwise, except for the module card the 3750X supports, its much like the 3750E.

PPS:

The original 3750 series offers much less internal fabric bandwidth, half the stack ring bandwidth, and "dumber" stack ring processing.  (re: "dumber", Stackwise places all traffic on the stack ring, and the source both places the frame on the ring and removes it.  Stackwise+ only places unicast frames on the stack ring that are non-local to the source stack member and the destination stack member removes the frame.)

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