Digi TransPort WR11 User Manual page 196

Configuring network interfaces
Boost the priority by n for s seconds after switching to the MASTER state
Increases the VRRP priority by the specified amount for the specified amount of time when the
router has become the VRRP group master. This option can be used to provide network
stability when the original master cycles between on- and offline, causing repeated VRRP state
switches.
Enable VRRP+ Probing
Enables VRRP+ probing on this Ethernet interface. VRRP+ probing allows a secondary router to
take over as master under a wider range of activity, by dynamically adjusting the VRRP priority
of an interface and if necessary, changing the status of that interface from master to backup
or vice-versa. It does this by probing an interface, either by sending an ICMP echo request
(PING) or by attempting to open a TCP socket to the specified Probe IP address.
Send p probe to IP address a.b.c.d TCP port n
Configures VRRP+ to send a probe packet to the appropriate IP address and TCP port. The TCP
port is needed if the probe type is TCP. The routing code determines which interface to use.
This allows the router to test other interfaces and adjust the VRRP priority according to the
status of that interface. For example, the user may wish to configure probing in such a way
that the Digi router WAN interface is tested, and adjust the VRRP priority down if the WAN is
not operational. Another example would be to probe the WAN interface of another VRRP
router, and adjust the local VRRP priority up if that WAN interface is not operational. When
configured to probe in this manner, it is necessary to configure a second Ethernet interface to
be on the same subnet as the VRRP interface. This is because you cannot use the VRRP
interface when it is in backup mode. The probes should be sent on this second interface. The
second interface has the other VRRP router as its gateway. Configure the routing table to
direct packets for the probe address to the desired interface.
every n seconds when in Backup state
The interval between successive probe attempts when the interface is in Backup state.
every n seconds when in Master state
The interval between successive probe attempts when the interface is in Master state.
Adjust priority n dir after x probe failures
Controls by how much and in which direction the VRRP priority is adjusted when the specified
number of probes have failed.
Digi TransPort® Routers User Guide
Configure Ethernet interfaces
196