Specifications

110 Chapter 4. Configuring Special Features
Adding a VRID Attribute Record
To define a record to contain the attributes for a VRID in a router, use this command:
eth vrrp add <vrid> [<port#>]
The port number is needed only if the router is an Ethernet hub router with two ports (port 0 and port 1).
Priority Attribute (0-255, default, 100)
The priority value determines which backup router takes over when a router fails. The original (or master) router
must be assigned the highest priority (255). Lower priorities are assigned to its backup routers, that is, the other
routers in which the same VRID is defined.
For example, suppose routers A, B, and C all have VRID 7 defined. If router B should take over if router A fails
and if router C should take over if both A and B fail, you would assign priority 255 to A and lower priorities to B
and C, such as, priority 100 to B and priority 50 to C.
The priority command is: eth vrrp set priority <priority> <vrid> [<port#>]
Time Interval Attribute (default, 1 second)
The time interval value specifies how often VRRP advertisement packets are sent. It also determines how quickly
a backup router can recognize that another VRRP router is down.
If the backup does not receive a VRRP packet from another VRRP router during the master down interval, the
backup assumes the other router is down. The master down interval is:
Master _Down_Interval = (3 * Time_Interval) + Skew_Time
Skew_Time = (256 - Priority) / 256
Thus, the default skew time is (256 - 100) / 256, or .609375. The default master down interval is (3 * 1) +
.609375, or 3.609375 seconds.
Note: The time interval must be the same for every router in the Virtual Router, that is, for every router in the
LAN with the same VRID. For example, if a VRRP interface in routers A, B, and C has the VRID 7, routers A, B,
and C must all specify the same time interval for VRID 7.
The time interval command is:eth vrrp set timeinterval <seconds> <vrid> [<port#>]
Password Attribute (no default)
You may specify an optional password of 1 to 8 characters. The password is only used to authenticate VRRP
advertisement packets. It is sent as clear text on the LAN. If you do not specify a password, no password
authentication is done.
Note: The password must be the same for every router in the Virtual Router, that is, for every router in the LAN
with the same VRID. For example, if a VRRP interface in routers A, B, and C has the VRID 7, routers A, B, and
C must all specify the same password for VRID 7.
The password command is:eth vrrp set password <string> <vrid> [<port#>]
The command to clear the password is:eth vrrp clear password <vrid> [<port#>]