Configure Ethernet interfaces
Digi TransPort User Guide 166
Enable VRRP+ Probing
Enables VRRP+ probing on this Ethernet interface. VRRP with probing differs from standard
VRRP in that it dynamically adjusts the VRRP priority of an interface and if necessary, changes
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. Hence VRRP operation is enhanced to ensure that a
secondary router can take over under a wider range of circumstances.
Send p probe to IP address a.b.c.d TCP port n
Configures VRRP+ to send a probe packet to desired IP address and TCP port. The TCP port is
needed if the probe type is TCP. The routing code determines which interface should be used.
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 the VRRP interface cannot be
used when it is in backup mode. The probes should be sent on this second interface. The
second interface will have the other VRRP router as its gateway. The routing table should be
configured 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.
Reset probe failure count after n probe successes
The number of consecutive successful probes that are required before the current failure
count is reset to 0.
Use interface x,y over which to send probe
Overrides the routing code and forces the probe packets to be sent out of a specific interface.
Get the source IP address from interface x,y
Enables probe packets having the source IP address from a specific interface, rather than the
interface over which it is being transmitted.
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