The following table gives definitions for some of the features used in this document.
| Acronym | Definitions | |
|---|---|---|
| Accept Mode | Controls whether a virtual router in Master state will accept packets addressed to the virtual IP address (VRRP IP address). The default is False. Deployments that rely on, for example, pinging the address owner's IPvX address may wish to configure Accept Mode to True. | |
| Preempt Mode | Controls whether a (starting or restarting) higher-priority Backup router preempts a lower-priority Master router. | |
| Primary IP Address | An IPv4 address is selected from the set of real interface addresses. In IPv4 mode, VRRP advertisements are always sent using the primary IPv4 address as the source of the IPv4 packet. For adding a secondary IP address, the use the secondary one should be explicitly specified. | |
| Priority | Priority value to be used by this VRRP router in Master election for this virtual router. The value of 255 (decimal) is reserved for the router that owns the IP address associated with the virtual router. The value of 0 (zero) is reserved for the Master router to indicate it is releasing responsibly for the virtual router. The range 1-254 (decimal) is available for VRRP routers backing up the virtual router. Higher values indicate higher priorities. The default value is 100 (decimal). | |
| Router Advertisement | This is an ICMP packet used by routers to advertise their presence together with various link and Internet parameters either periodically. Router Advertisements contain prefixes that are used for determining whether another address shares the same link (on-link determination) and/or address configuration, a suggested hop limit value, etc. | |
| VRRP Router | A router running VRRP. It may participate as one or more virtual routers. | |
| Virtual Router (VR) | An abstract object managed by VRRP that acts as a default router for hosts on a shared LAN. It consists of a Virtual Router Identifier and either a set of associated IPv4 addresses or a set of associated addresses across a common LAN. A VRRP Router may back up one or more virtual routers. The scope of each virtual router is restricted to a single LAN. | |
| Virtual Router Master | The VRRP router that is assuming responsibility of forwarding packets sent to the IP address(es) associated with the virtual router answering ARP requests. | |
| Virtual Router Identifier (VRID) | This is the VRRP group number. It is configurable item in the range 1-255 (decimal). There is no default. |
These definitions have been taken from
Network Working Group, RFC 3768 Virtual Router Redundancy Protocol (VRRP)