Stacks Implementation in Ethernet switches

Multiple stacking-capable switches can be connected using stack cables to form a stack. These switches, usually referred to as stack members, form a unified system. To the network, the complete stack functions as a single entity.

The following scenarios are available on Ethernet Switches series (S5700, and S6700).

• Improving reliability

        In redundancy mode, many stack members work together. SwitchA and SwitchB create a stack and back up         each other in the diagram above. When SwitchA fails, SwitchB takes over as SwitchA to keep the stack                  functioning smoothly. Inter-device link aggregation and link redundancy are also supported by the stack.

• Increasing the number of ports:

  When a switch does not have enough ports to serve a rising number of users, more switches can be added to the original switch to address this need, as indicated in the diagram below.

  
  

• Increasing bandwidth

  Add new stack members and bundle their physical links into a link aggregation group to improve uplink bandwidth, as indicated in the diagram below.
  
  
  

  

• Simplifying network topology

  Multiple switches are virtualized into a single logical switch in the diagram below. Because this network does not require MSTP, network setting is significantly easier. Inter-device link aggregation also enhances network reliability and speeds up network convergence.

  
  

  
  

• Implementing long-distance stacking
  Users on each floor connect to the external network via corridor switches that are widely apart in the diagram below. Stack cables are used to connect corridor switches in a building to form a stack. As a result, each building has only one virtual access switch, simplifying the network, and many connections to the core network, increasing network robustness and reliability. Rather than configuring corridor switches one by one, the administrator merely needs to configure stacks. This saves money on management and upkeep.
  
  

Source: https://support.huawei.com/hedex/hdx.do?docid=EDOC1100126530&id=EN-US_CONCEPT_0177108888&lang=en

Hi zaheernew,
A stack can be set up on a switch in the following scenarios:
Stacking using stack cards
Stacking through common cables of service ports
Stacking using dedicated cables for service ports

For the configuration, you can refer to 

Example for Establishing a Stack Using Stack Card Connections

Example for Establishing a Stack Through Service Port Connections Using Ordinary Stack Cables

Example for Establishing a Stack Through Service Port Connections Using Dedicated Stack Cables

I hope it helps!