Which should I prefer to enhance reliability of S series switches, stacking or VRRP

For S series switches (except the S1700), stacking technology combines multiple stacking-capable switches into one logical switch. After switches set up a stack, upstream and downstream devices consider them as one switch. Stacking technology provides high network reliability and forwarding performance, while simplifying network management. It has the following advantages:
- High reliability Member switches in a stack work in redundancy mode. Link redundancy can also be implemented between member switches through inter-device link aggregation.
- High scalabilityYou can increase ports, bandwidth, and processing capacity of a stack by simply adding member switches to the stack. Member switches can join or leave the stack without affecting other member switches. New switches automatically synchronize the configuration file and system software version with the master switch.
- Simplified configuration and management You can log in to a stack from any member switch to manage and configure all the member switches in a stack. In addition, complicated Layer 2 ring protection protocols or Layer 3 protection switching protocols are not required after switches set up a stack; therefore, the network configuration is simplified.

Virtual Router Redundancy Protocol (VRRP) virtualizes multiple routing devices into one logical routing device and uses the IP address of the logical routing device as the default gateway address of users to implement communication with external networks. If the gateway fails, VRRP elects a new gateway to transmit data traffic, ensuring network reliability. On a multicast or broadcast LAN (for example, an Ethernet), VRRP ensures that high-reliability default links can be provided if the gateway fails. VRRP prevents network interruption caused by a single link failure without modification in configurations of the gateway or host.
Select stacking or VRRP based on actual networking requirements.

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