Netgear M4300-12X12F (XSM4324S) - Stackable Managed Switch with 24x10G including 12x10GBASE-T and 12xSFP+ Layer 3 Administrator's Guide

Enable loop protection on ports 1/0/1 and 1/0/2 and set the violation action to shutting down the 
port and logging a message.

If you are managing a large network with thousands of switches, the best way to change the 
switch configuration is to provide a new startup configuration file to the switch and let the 
switch gracefully resolve any differences between the running configuration and the new 
configuration by using the Nondisruptive Configuration Management feature.

For example, if VLANs 10, 20, and 30 are configured on the switch while the new 
configuration includes VLANs 10, 20, and 40, the switch must delete VLAN 30, create VLAN 
40, and leave traffic that is being forwarded on VLANs 10 and 20 undisturbed. 

To apply a new switch configuration without using the Nondisruptive Configuration 
Management feature, you must either restart the switch or send a delta configuration to the 
switch. Restarting the switch is disruptive, and managing delta configurations on a large 
scale can be difficult.

The following example shows how you can install a new configuration on a switch by using 
the Nondisruptive Configuration Management feature:

Download the file with the new configuration to switch.

Merge the new configuration with the current configuration.

Save the changes.

(Netgear Switch) (Config)#interface 1/0/1,1/0/2

(Netgear Switch) (Interface 1/0/1-1/0/2)#keepalive

(Netgear Switch) (Interface 1/0/1-1/0/2)#keepalive action both

(Netgear Switch) # Copy tftp://172.26.2.21/new_config.scr nvram:script new_config.scr

(Netgear Switch) # Reload configuration new_config.scr 

(Netgear Switch) #save