Allied Telesis AT-9724TS - Manual (Page 128)

Parameter Description
Interface Name Enter the name of a previously configured IP interface to create a VRRP entry for.This IP interface must be
assigned to a VLAN on the Switch.
VRID (1-255) Enter a value between 1 and 255 to uniquely identify this VRRP group on the Switch.All routers participating in
this group must be assigned the same VRID value.This value MUST be different from other VRRP groups set on
the Switch.
IP Address Enter the IP address that will be assigned to the VRRP router.This IP address is also the default gateway that
will be statically assigned to end hosts and must be set for all routers that participate in this group.
Admin. State Used to enable (Up) and disable (Down) the VRRP IP interface on the Switch.
Priority (1-254) Enter a value between 1 and 254 to indicate the router priority.The VRRP Priority value may determine if a
higher priority VRRP router overrides a lower priority VRRP router.A higher priority will increase the
probability that this router will become the Master router of the group.A lower priority will increase the
probability that this router will become the backup router.VRRP routers that are assigned the same priority
value will elect the highest physical IP address as the Master router.The default value is 100. (The value of 255 is
reserved for the router that owns the IP address associated with the virtual router and is therefore set
automatically.)
Advertisement Interval (1-255) Enter a time interval value, in seconds, for sending VRRP message packets.This value must be consistent with all
participating routers.The default is 1 second.
Preempt Mode This entry will determine the behavior of backup routers within the VRRP group by controlling whether a
higher priority backup router will preempt a lower priority Master router.A True entry, along with having the
backup router’s priority set higher than the masters priority, will set the backup router as the Master router.A
False entry will disable the backup router from becoming the Master router.This setting must be consistent
with all routers participating within the same VRRP group.The default setting is True.
Critical IP Address Enter the IP address of the physical device that will provide the most direct route to the Internet or other
critical network connections from this virtual router.This must be a real IP address of a real device on the
network. If the connection from the virtual router to this IP address fails, the virtual router will automatically
disabled.A new Master will be elected from the backup routers participating in the VRRP group. Different
critical IP addresses may be assigned to different routers participating in the VRRP group, and can therefore
define multiple routes to the Internet or other critical network connections.
Checking Critical IP Use the pull-down menu to enable or disable the Critical IP address entered above.
Auth. Type Specifies the type of authentication used.The Auth.Type must be consistent with all routers participating within
the VRRP group.The choices are:
None – Selecting this parameter indicates that VRRP protocol exchanges will not be authenticated.
Simple – Selecting this parameter will require the user to set a simple password in the Auth. Data field for
comparing VRRP message packets received by a router. If the two passwords are not exactly the same, the
packet will be dropped.
IP – Selecting this parameter will require the user to set a MD5 message digest for authentication in comparing
VRRP messages received by the router. If the two values are inconsistent, the packet will be dropped.
Auth. Data This field is only valid if the user selects Simple or IP in the Auth.Type field. Simple will require the user to
enter an alphanumeric string of no more than 8 characters to identify VRRP packets received by a router. IP will
require the user to enter a MD5 message digest for authentication in comparing VRRP messages received by
the router.This entry must be consistent with all routers participating in the same IP interface.
Click Apply to implement changes made.
To view the settings for a particular VRRP setting, click the corresponding View in the VRRP Interface Table of the entry, which will display the following:
127 Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch