1. How the standby unit will detect failover in following two cases(if the actual primary unit has been powered Off due to some
1. If we are using a crossover cable to connect the active and standby units
2. If we are connecting active and standby units using a switch
I am asking this is because the standby unit will send the heartbeat to check whether the active unit is up or not and if the standby unit did not receive the answer from primary unit in time then the failover will take place
but if the active unit got powered off then it means the Sync port(used for heartbeat) is also down on primary side
Then how the standby unit will detect whether the active is down because the sync connectivity is lost(because one end of
the sync cable is off at primary side) and standby will not be able to send the heartbeat to check .The failover will
take place when the standby will send the heartbeat and will not get the reply..but here the standby is not even able
to send the heartbeat because to send the heartbeat the other end of the cable should be active.
2. It is mentioned that the MAC exchange will happen between Primary and secondary when failover take place.
How that is possible..Because MAC address is always bind to the ethernet card on the device and it will never change,
IP addresses can interchange in case of Failover.
3.Whether the IKE and IPsec SAs will also get synced in stateful connections.I mean if the primary unit fails then the VPN SAs will also get transferred to standby unit and if yes whether the running VPN connections on active will be maintained on the standby unit.