Install guide

76 VRRP Preemption Delay Release Note
Software Version 2.7.5
C613-10454-00 REV A
Command Reference Updates
This section describes each new command and the changed portions of
modified commands and output screens. For modified commands and output,
new parameters, options and fields are shown in bold.
create vrrp
Syntax CREate VRRP=vr-identifier OVER=physical-interface
IPaddress=ipadd [ADINTerval=1
..255]
[ADOPTvrip={ON|OFF}]
[ADVertisements={ON|OFF|YES|NO|TRUE|FALSE}]
[AUTHentication={NONE|PLAINtext}] [PASSword=password]
[PORTMOnitoring={ON|OFF}
[STEPVALue={stepvalue|PRoportional}]]
[PREEmpt={ON|OFF}] [DELay=0
..3600] [PRIOrity=1..254]
Description This command creates a VRRP virtual router with a specific identifier (VRID).
The new delay parameter specifies the number of seconds that a higher
priority device must wait before preempting a lower priority device. It allows a
delay of up to one hour (3600 seconds). This parameter is valid only when the
preempt parameter is on.
After a device determines it has the highest priority, it waits the delay time, and
then assumes control. A delay can ensure that there is adequate time for the
master to update its routing tables before taking over. The default is 0 or off.
We recommend that all devices participating in the same virtual router be
configured with the same delay value. This should be the case if all switches
have an equal amount of routing information to update before becoming the
new master. Command checking does not enforce this because it cannot
determine the values of delays set on other switches. In some cases it may be
valid to have different values on different devices; doing so does not affect the
delay function as long as the value covers the “worst case” time required to
fully update routing tables.
The existing preempt parameter specifies whether a higher priority router or
switch preempts a lower priority router or switch acting as the master. If on,
preempt mode is used. The default is on. If this parameter is off, preemption
cannot occur; any preemptions in progress are cancelled immediately.
The preferred master (with a priority of 255) always assumes the master role
when it is available, regardless of the setting of this parameter. Note that all
routers or switches in the same virtual router must be configured with the
same value for this parameter. The default is on.