Brocade Communications Systems ICX 7250 series, Configuration Manual

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Virtual router
A collection of physical routers that can use VRRP to provide redundancy to routers within a LAN.
Virtual router ID
A group of physical routers that are assigned to the same virtual router ID (VRID).
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.
VRRP hold timer
The hold timer delays the preemption of a master VRRP device by a high-priority backup device.
A hold timer is used when a VRRP-enabled device that was previously a master device failed, but is now back up. This restored device
now has a higher priority than the current VRRP master device, and VRRP normally triggers an immediate switchover. In this situation, it
is possible that not all software components on the backup device have converged yet. The hold timer can enforce a waiting period
before the higher-priority backup device assumes the role of master VRRP device again. The timer must be set to a number greater than
0 seconds for this functionality to take effect.
Hold timer functionality is supported in both version 2 and version 3 of VRRP and VRRP-E.
VRRP interval timers
Various timers for the intervals between hello messages sent between devices running VRRP can be configured.
hello intervals
Hello messages are sent from the master VRRP device to the backup devices. The purpose of the hello messages is to determine that
the master device is still online. If the backup devices stop receiving hello messages for a period of time, as defined by the dead interval,
VRRPv2 overview
Brocade FastIron Layer 3 Routing Configuration Guide
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