Introduction

Layer 3 configuration is considered advanced configuration. This can be a very powerful tool when used correctly, but when configured or used inappropriately, it may cause issues.

1. (Optional) Have access to the configuration of the GigaCore from another group. This can apply when for example:
   
1. You would like to allow the lighting technicians to do switch configuration from inside the lighting group, but don't want them to have two network interfaces (1 for the lighting group and 1 for the management group).
   
2. You would like to have redundant configuration options on the GigaCore. Connect your management computer with 2 separate network interfaces to the network. If something would happen with the primary interface, you still have a backup.
   
2. Prevent issues like Linux Reverse Path Filtering. When a group has a Layer 3 IPv4 address, all packets generated by the switch in that group, will have the Layer 3 IPv4 address as the source address. Note that the IGMP querier IP address is still managed and configured separately.
   
3. A Layer 3 IPv4 address is a prerequisite for other Layer 3 functionality such as:
   
1. DHCP server
   
2. Routing
   

Requirements

1. Firmware version v1.7.0 or newer is required
2. This feature is only supported on Gen2 GigaCore switches with more than 10 ports.
   Layer 3 functionality is not available on the following models:
1. GigaCore 10i
   
2. GigaCore 10t
   
3. GigaCore 10t-IP

Configuration

Web interface

1. Browse to the web interface of the GigaCore through a port and with an IP address on which configuration is possible. Typically this is through ports indicated with the blue LED of the management group.
   
2. Go to 'Groups | Trunks' configuration in the sidebar
   
3. Go to the 'Edit groups' tab
   
4. Select the group for which you would like to configure a Layer 3 IP address
   
5. Scroll down until the 'Layer 3' configuration section.
   
6. Enable the 'Layer 3' checkbox to unlock Layer 3 functionality.
   
   
7. Fill in the IP address you would like to use.
   Note that this IP range cannot overlap with the device IP address or with IP addresses used in other groups.
   By default, the web interface will fill in the IP address 10.<group ID>.C.D/16 where .C.D are the last 2 elements of the device IP address at that moment.
8. Optionally: check the checkbox 'Allow config' if you would like to have the option to manage the switch from this group.
   
9. Apply the settings with the 'Apply' button in the top right corner.
   

The 'Preserve IP settings' option when recalling a profile or resetting the device, will only keep the device IP settings. Current Layer 3 configuration will not be preserved.
It is not possible to use 'Preserve IP Settings' when recalling a profile that has Layer 3 configuration.