Stackwise, VSS, VPC, MLAG

SOURCE:
https://supportforums.cisco.com/discussion/12367366/vss-vs-stackwise-vs-vpc

Stackwise:
This is the Proprietary cabling mechanism and is limited to distance. The advantage of Stackwise over VSS is that you can add/stack around 9 devices at one go.Were as you cant do the same with VSS.

Another advantage is that if stacking device does not require any configuration only that the device needs to be supported.
Cisco StackWise technology unites up to nine individual switches into a single logical unit, using special stack-interconnect cables and stacking software. The individual switches can be any combination of Cisco Catalyst 3750 and Cisco Catalyst 3750-E Series Switches.

VSS (Virtual Switching System):
SOURCE:
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-virtual-switching-system-1440/prod_qas0900aecd806ed74b.html

VSS can be done with 4500 or 6500 series . It supports only two chasis and it uses 10GE interfaces and can be geographically separated.

VPC (Virtual PortChannel):
SOURCE:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

It is Nexus specific technology and you cant configure this with other catalyst switches.
This is the new technology were in you can connect one switch (Access)to two uplink switches(distribution switch) and form an ether channel between them. Thats the good advantage of VPC which none of them have.

MLAG (Multichassis Link Aggregation):
SOURCE:
http://ethancbanks.com/2014/03/27/the-ethernet-switching-landscape-part-04-multichassis-link-aggregation-mlag/

Both Arista’s MLAG and Cisco’s vPC are similar to configure and operate, with similar concerns. In general, I found the Arista MLAG setup a bit easier, because many of the details are handled for the network operator when compared to the more granular fussiness of the vPC configuration.

MLAG is the ability of two and sometimes more switches to act like a single switch when forming link bundles. This allows a host to uplink to two switches for physical diversity, while still only having a single bundle interface to manage.

Also, two switches could connect to two other switches using MLAG, with all links forwarding.

For access layer when I have only 3750 stackable switches I cant do VSS or VPC on that hence would be using stacking and connecting them together to have single access.

6500/4500 I would use the VSS here at the distribution layer to avoid much impact.
VPC is best but you need to have Nexus device if you want to use this feature.
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