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Rockwell Automation Publication 1783-UM007I-EN-P - December 2017 117
Configure Switch Features Chapter 3
Table 40 - Config DHCP Fields
Field Description
Ring DHCP Server Enable Check the checkbox to enable the ring DHCP server on the DLR supervisor device.
Role Choose a role to assign to the ring DHCP server.
Valid values:
• None—The server is inactive.
• Primary—The DLR supervisor functions as the active ring DHCP server.
• Backup—The DLR supervisor functions as the backup ring DHCP server.
Ring DHCP snooping Check the checkbox to restrict the broadcast of DHCP requests from going beyond the ring. Only devices in the ring receive address assignments
from the DHCP server.
DHCP snooping is enabled by default. If you are not using DLR DHCP, you must disable Ring DHCP snooping to use DHCP server functionality
outside of the ring.
Status Displays the status of the ring.
Valid values:
• Normal
• Ring Fault
• Unexpected Loop Detected
• Partial Network Fault
• Rapid Fault/Restore Cycle
Number of Devices Type the number of devices in the ring, including switches.
Backup Interval Type the interval in seconds at which the backup ring DHCP server reads the reference table of the active ring DHCP server.
Valid values: 1…65535 seconds
Default: 60
Enable CIP When the role of the ring DHCP server is Backup, check Enable CIP to enter the active ring DHCP server CIP IP address.
Active DLR DHCP Server IP (Available only when Enable CIP is checked). Type the active ring DHCP server CIP IP address, which allows the backup ring DHCP server to sync
information with the active ring DHCP server.
Index Indicates the ring member location.
Valid values: 2…255
IP Address Indicates IP address of the ring member.
Host Name Indicates host name associated with the IP address of the ring member.
Pool Indicates the name of the pool of IP addresses available for DLR DHCP. The DHCP pool must be previously configured on the Global Settings tab
on the DCHP page.