Before implementing VRRP in your network, you must understand some key terms and definitions.
The following VRRP-related terms are in logical order, not alphabetic order:
| Virtual router | A collection of physical routers that can use VRRP to provide redundancy to routers within a LAN. |
| Virtual router group | A group of physical routers that are assigned to the same virtual router. |
| Virtual router address | The virtual router IP address must belong to the same subnet as a real IP address configured on the VRRP interface, and it can be the same as a real IP address configured on the VRRP interface. The virtual router whose virtual IP address is the same as a real IP address is the IP address owner and the default master. |
| Owner | The owner is the physical router whose real interface IP address is the IP address that you assign to the virtual router. The owner responds to packets addressed to any of the IP addresses in the corresponding virtual router. The owner, by default, is the master and has the highest priority (255). |
| Master | The physical router that responds to packets addressed to any of the IP addresses in the corresponding virtual router. For VRRP, if the physical router whose real interface IP address is the IP address of the virtual router, then this physical router is always the master. |
| Backup | Routers that belong to a virtual router, but are not the master. If the master becomes unavailable, the backup router with the highest priority (a configurable value) becomes the new master. By default, routers are given a priority of 100. |