224 Rockwell Automation Publication 1783-UM007G-EN-P - February 2017
Chapter 7 Configure Switch Features
In this example, the active ring DHCP server recognizes IP address requests
from ring devices 3, 4, and 6 and responds with the position-based IP address
specified in the DHCP table (
Table 43). The ring device index numbers in the
DCHP table begin incrementing in order from the device connected to the
lowest DLR port. For example, in
Figure 19, the DLR ports are Gi1/1 and
Gi1/2. The lowest DLR port is Gi1/1, so the device connected to Gi1/1 has an
index number of 2.
Figure 19 - DHCP for Ring Devices
Com
IN2
Ref
IN1
Alarm
IN1 IN2 OUT
DC+
Pwr A
Express
Setup
Console
DC-
DC+
Pwr B
Com
IN2
Ref
IN1
Alarm
IN1 IN2 OUT
DC+
Pwr A
Express
Setup
Console
DC-
DC+
Pwr B
Ring Device 1
• Active Ring Supervisor
• Active Ring DHCP Server
• Static IP Address: 192.168.1.10
Ring Device 2
• Backup Ring Supervisor
• Backup Ring DHCP Server
• Static IP Address: 192.168.1.11
Outside Network
DLR Port Gi1/1
DLR Port Gi1/2
Ring Device 3
BOOTP IP Address:
192.168.1.12
Ring Device 4
DHCP IP Address:
192.168.1.13
Ring Device 5
Static IP Address:
192.168.1.14
Ring Device 6
BOOTP IP Address:
192.168.1.15
Table 43 - Example DHCP Table for Ring Devices
Ring Device Index
(1)
IP Address Host Name DHCP Pool
2
3 192.168.1.12 Rack 2 Pool 1
4 192.168.1.13 Rack 3 Pool 1
5
6 192.168.1.15 Rack 5 Pool 1
(1) Index 1 represents the active ring DHCP server and is not configurable.
ATTENTION: Use caution with automatic IP address assignment when
wiring DLR with symmetric devices. The controller cannot detect incorrect IP
addresses of identical devices in the wrong position.
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