cisco router configuration commands cheat sheet

Router R1 is responsible for forwarding packets sent to this IP address. The IP address of the virtual router is the same as that configured for the Ethernet interface of Router R1 (i.e., the master router).

In this example, Routers R1, R2, and R3 are VRRP routers that comprise a virtual router. The figure below shows a LAN topology in which VRRP is configured. The LAN clients can then be configured with the virtual router as their default gateway. This is where VRRP comes in to save the day! VRRP solves the static configuration problem by enabling a group of routers to form a single virtual router.

This creates a single point of failure and is not ideal for when you require a highly efficient, automated LAN network with multiple backups. However, if the default gateway fails, the LAN client is limited to communicating only on the local IP network. A major con of using a dynamic process is that it incurs additional configuration and processing overhead on the LAN client and router switching (router switches are far slower).Īlternatively, a static configuration can be adopted, which simplifies the process. Two main options exist for a LAN client to determine which router should be prioritized, using a dynamic process or a static configuration. Lastly, we provide a full VRRP configuration guide to get you set up in record time! How Does a VRRP Operate? In this article, we will walk through the operation of the VRRP, as well as look at the benefits of having a VRRP on your LAN network.

One router is elected as the master virtual router, with the other routers acting as backups if a master virtual router fails due to a malfunction or power loss. This allows for several routers on a multi-access link to utilize the same virtual IP address. A VRRP is an election protocol that dynamically assigns the responsibility for one or more virtual routers to the VRRP routers on a LAN. A Virtual Router Redundancy Protocol (VRRP) may be just the solution for you if you require router backups on the same LAN network.

Cisco router configuration commands cheat sheet