Virtual Router Id (Vrid); Priority - Alcatel-Lucent 7450 Configuration Manual

VRRP Components

Virtual Router ID (VRID)

The VRID must be configured with the same value on each virtual router associated with the
redundant IP address (IP addresses). It is placed in all VRRP advertisement messages sent by
each virtual router.

Priority

The priority value affects the interaction between this VRID and the same VRID of other
virtual routers participating on the same LAN. A higher priority value defines a greater
priority in becoming the virtual router master for the VRID. The priority value can only be
configured when the defined IP address on the IP interface is different than the virtual router
IP address (non-owner mode).
When the IP address on the IP interface matches the virtual router IP address (owner mode),
the priority value is fixed at 255, the highest value possible. This virtual router member is
considered the owner of the virtual router IP address. There can only be one owner of the
virtual router IP address for all virtual router members.
The priority value 0 is reserved for VRRP advertisement message purposes. It is used to tell
other virtual routers in the same VRID that this virtual router is no longer acting as master,
triggering a new election process. When this happens, each backup virtual router sets its
master down timer equal to the skew time value. This shortens the time until one of the
backup virtual routers becomes master.
The current master virtual router must transmit a VRRP advertisement message immediately
upon receipt of a VRRP message with priority set to 0. This prevents another backup from
becoming master for a short period of time.
Non-owner virtual routers may be configured with a priority of 254 through 1. The default
value is 100. Multiple non-owners can share the same priority value. When multiple non-
owner backup virtual routers are tied (transmit VRRP advertisement messages
simultaneously) in the election process, both become master simultaneously, the one with the
best priority will win the election. If the priority value in the message is equal to the master's
local priority value, then the primary IP address of the local master and the message is
evaluated as the tie breaker. The higher IP address becomes master. (The primary IP address
is the source IP address of the VRRP advertisement message.)
374
• Virtual MAC Address
• Inherit Master VRRP Router's Advertisement Interval Timer
• Policies
Router Configuration Guide