VRRP

In today’s world of networking technologies, combining two remote offices into a single entity is a fairly routine task. Usually, L3 tunnels are used for this (for example, IPIP or IPsec). However, there are situations when simple routing is not enough and full L2 connectivity is required, as if remote devices were connected to the same switch.

Let’s figure out when this is necessary and how to configure such connectivity correctly so that it is not only working but also fault-tolerant.

Redundancy of Interoffice Links (Site-to-Site VPN, MPLS, Dark Fiber)

We’ve already discussed how to ensure reliable connectivity within a single building. Now let’s look at a more complex but equally critical topic: redundancy of communication links between geographically distributed offices or branches. This is crucial for companies where employees across locations need to exchange data, access shared resources (such as a central CRM, file servers, or IP telephony), and work as a unified whole.