Redundancy

  • [ACP-DC Training#11] Loop Prevention and LAG Implementation

    Data center design involves multiple layers of redundancy, extending from server NIC cards to uplinks and switches. While this redundancy is essential, it simultaneously increases the risk of network loops, broadcast storms, and network outages. Today, we will learn key technologies to prevent these risks and build high-performance, redundant L2 data centers. 1. Structure of a Collapsed Core L2 Data Center A data center is…

  • [ACP-DC Training #4] Building a Data Center Network

    We have finally successfully completed the first step of building the data center network. Over the past period, we have understood the basic overview of the data center network and secured sufficient important resources and materials, namely the necessary products (hardware) and technologies (protocols). This process can be likened to an architect understanding blueprints and preparing the required materials before constructing a building. From now on, we will actually utilize these prepared resources to…

  • [ACSA Education #34] VRRP

    In the previous post, we looked into the Default Gateway. An endpoint can only have one Default Gateway. And it can become a single point of failure. Looking at the figure below, if Core-1 fails, all hosts using Core-1 as the Default Gateway, including PC-1, will be isolated. How should we deal with this situation? Redundancy…

  • [ACSA Education #24] Redundant Network

    Network communication is critical to IT infrastructure. It often has a significant impact on services. As shown below, if there is only one path connecting to the Core-1 switch, and the link between the two access switches and the Core-1 switch is severed, the network will be disconnected, and ultimately, Host A and Host B will be unable to communicate with each other. To solve this…