Netgear M5300-28G-POE+ (GSM7228PSv1h2) - 12-Port Managed Gigabit Switch Softwarehandbuch

Use this command to display the stack firmware synchronization configuration status. 

You can describe a switch in terms of three semi-independent functions: the forwarding 
plane, the control plane, and the management plane. The forwarding plane forwards data 
packets. The forwarding plane is implemented in hardware. The control plane is the set of 
protocols that determines how the forwarding plane must forward packets, which data 
packets can be forwarded, and where the data packets must be forwarded to.

Application software on the management unit functions as the control plane. The 

management plane is also application software that runs on the management unit and that 
provides interfaces, allowing you to configure and monitor the device.

Nonstop forwarding (NSF) allows the forwarding plane of stack units to continue to forward 
packets while the control and management planes restart as a result of a power failure, 
hardware failure, or software fault on the management unit. 

You can also manually initiate a nonstop forwarding failover by issuing the initiate 
failover

 command. If the management unit fails, traffic flows that enter and exit the stack 

through physical ports on a unit other than the management unit continue with at most a 
subsecond interruption.

To prepare the backup management unit for a failover, applications on the management unit 
continuously checkpoint (that is, forward) information to the backup unit. Changes to the 
running configuration are automatically copied to the backup unit. MAC addresses stay the 
same across a nonstop forwarding failover so that neighbors do not need to relearn them.

When a nonstop forwarding failover occurs, the control plane on the backup unit starts from a 
partially-initialized state and applies the checkpointed (that is, forwarded) information. While 
the control plane is initializing, the stack cannot react to external changes, such as network 
topology changes. When the control plane is fully operational on the new management unit, 
the control plane ensures that the hardware state is updated as necessary. The control plane 
failover time depends on the size of the stack, the complexity of the configuration, and the 
speed of the CPU.

Format

show auto-copy-sw

Mode

Privileged EXEC

Synchronization

Shows whether the SFS feature is enabled.

SNMP Trap Status

Shows whether the stack sends traps for SFS events

Allow Downgrade

Shows wether the stack manager is permitted to downgrade the firmware version of a

stack member.