USER GUIDE
EdgeSafe Bypass | M100G1xx
5.3 Heartbeat Checking Mode
The Heartbeat Checking Mode is an Appliance aliveness detection mechanism that M1001Gxx system used
to determine whether to switch from INLINE mode to BYPASS mode for the NET ports, in order to maintain
traffic forwarding operation in the event of Transparent Network Appliance failures.
To turn on Heartbeat Checking, the user will need to enable Heartbeat Active Mode.
5.3.1 Heartbeat checking Logic
When Heartbeat Active Mode is enabled, M1001Gxx will send heartbeat packets from Mon ports to the
connected Network Appliance periodically. When the Network Appliance receives heartbeat packet from
one of the Mon ports, it is supposed to forward the received heartbeat packets to the other Mon port.
5.3.1 Heartbeat checking Logic
The M100G1AC will be expecting continuous Heartbeat packet forwarding by the Network appliance to its
Mon ports and will use this to determine the aliveness of the Network Appliance.
If the M100G1AC does not receive heartbeat packets forwarded by the Network Appliance from the Mon
ports, the M100G1AC will set the Application State (as shown in the Module Status Page) to Failed and
switch to Active Bypass, TAP or Linkdrop mode according to the predefined settings of the Heartbeat
Active Expired OP Mode parameter.
5.3.1.2 Application Active Restore
Application Active Restore is a configuration which determines whether M100G1AC will try to recover
from an Application Failure.
When Application Active Restore is turned on, the M100G1AC will keep sending Heartbeat packet from its
Mon ports to the connected Network Appliance in order to detect the recovery of the Network Appliance.
Upon receiving the forwarded heartbeat packet again on the Mon ports, the M100G1AC will start a
application recovery sequence. The M100G1AC will expect heartbeat packets to be received consecutively
within a timer defined by Heartbeat Recover Timer before it determines that the Network Appliance has
indeed recovered, and the Application State will be set to OK.
If the Heartbeat Recover Timer is set to 0, than the Application State will be set to OK upon the receiving
of the first heartbeat packet forwarded by the Network Appliance.
If the Application Active Restore is turned off, then M100G1AC will stay in the Application Failed state, and
the operation mode will stay in either Bypass/LinkDrop/Tap as configured in Heartbeat Active Expired OP
Mode. And also the M100G1AC will stop sending heartbeat packets to its Mon ports. It will need user
intervention to resume the normal INLINE operation.
5.3.2 Monitor link failure
The Mon port link failure is treated the same as a heartbeat lost event. And if Heartbeat Active Mode is
turned on, the Application State will be set to Failed, and the operation mode will be set to the mode as
configured in heartbeat Active Expired OP Mode.
5.4 Additional features
This section lists some additional features of M100G1AC.
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