VPC (Virtual Port Channel) is a technology in Cisco network equipment, which allows a logical port channel to be formed between two switches (usually core switches), and they are regarded as a logical switch. VPC technology can improve network reliability and availability, while also providing better performance and flexibility.
When using VPC technology, a bidirectional peer-link channel needs to be configured between two switches, and the peer-link channel can use multiple physical interfaces for binding. In each VPC domain, multiple physical interfaces can be bound into a logical VPC port channel to provide higher bandwidth and reliability. The VPC port channel will be connected to both switches at the same time, but only one of the switches will be used for data transmission, which can avoid loops in the network.
In VPC technology, status information such as MAC addresses and VLAN information are synchronized between switches to ensure network consistency and availability. In addition, VPC technology also provides some high-availability functions, such as peer-gateway and peer-switch, etc., to ensure that when a switch fails, it can be quickly switched to a backup switch to ensure network reliability and connectivity.
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