Assigning Roles and IP Addresses to Ethernet Ports
Original instructions
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Introduction
Use the Communication Settings → IP Setting tab to assign roles and IP address settings to the three ports of the BMENOP0300 module.
After changing any IP address setting in this tab, click Apply to confirm and retain your edits before clicking another Communication Settings tab. Alternatively, you can click Cancel to delete your edits on the current tab and restore the previous setting.
Port Roles
The BMENOP0300 module includes three Ethernet ports and supports three different IP interfaces. These ports can be configured as the following port types:
Type
Description
Available
Port 1 (ETH 1)
Ports 2/3 (ETH 2/3)
Backplane Port
Access Port
Diagnostic information is available via explicit messaging (Modbus) or via SNMP.
NOTE: A port set to Access Port type uses the IP address of the network that is set for Ports 2/3.
√
√
√
Extended Network
You can extend the device network by adding another network to this port.
√
√
√
Port Mirroring
You can connect to this port via a PC and use packet sniffing software to analyze the traffic traveling through one or more of the other module ports.
√
–
–
Dedicated Network Ports
Ports 2 and 3 (ETH 2 and ETH 3) share a single IP address and are dedicated connections.
NOTE: Ports 2 and 3 (ETH 2 and ETH 3) support RSTP.
–
√
–
√ The port type is available for this port.
– The port type is not available for this port.
The module includes an IP forwarding service that handles and forwards packets among the three IP interfaces.
Ethernet Frames
The BMENOP0300 module supports the Ethernet II frame type. The module supports the IEEE 802.3 frame type only for RSTP.
Assigning IP Address Settings
All IP addresses settings need to be manually assigned in this window as part of module configuration.
The IP Setting tab presents separate configuration areas for Port 1, Port 2/3, and the Ethernet Backplane Port. To configure each port, enter values for the following settings.
The BMENOP0300 module supports IP V4 only.
Setting
Description
Type
Select the role to assign to the port. Selections include:
  • Port 1:
    • Access Port
    • Port Mirroring
    • Extended Network
  • Ports 2/3: Please configure IP settings of Ports 2/3 in Control Expert.
  • Backplane Port
    • Access Port
IP
A 32-bit IP address assigned to the port, including both network and host components.
Sub-Network Mask
A 32-bit value used to mask the network portion of the IP address and reveal the host address.
Default Gateway
For ports 2/3, the IP address of the IP forwarding service that is the access point to a remote network.
NOTE: 0.0.0.0 is a valid setting.
NOTE:
Configuring Port Mirroring
You can configure Port 1 (ETH 1) to serve as a mirroring port. A copy of Ethernet packets traveling through other selected ports is sent to Port 1, where you can use a packet sniffer to monitor and analyze network traffic.
When port mirroring is enabled, Port 1 becomes a read-only port. There is no access to network devices via this port while port mirroring remains enabled.
To configure Port 1 (ETH 1) for port mirroring, follow these steps:
Step
Action
1
In the Port 1 area, select Port Mirroring as the port Type.
The check boxes at the bottom of the Port 1 area are enabled.
2
Select the ports whose traffic is mirrored and sent to Port 1:
Enable Internal Port
Select this to send a copy of traffic passing through the internal port (between the module’s IP forwarding service and the CPU) to Port 1.
Enable ETH 2
Select this to send a copy of traffic passing through Port 2 (ETH 2) to Port 1.
Enable ETH 3
Select this to send a copy of traffic passing through Port 3 (ETH 3) to Port 1.
Enable Backplane Port
Select this to send a copy of traffic passing through the backplane port to Port 1.
3
Click Apply to confirm your edits.
4
Click Save to save your edits.
Determining Port Default IP Addresses
If one or more Ethernet ports on the BMENOP0300 module are not manually assigned an IP address, the module automatically assigns default IP addresses that are based on the MAC address, as follows:
Where:
However, if the sixth octet of the module MAC address is 0xff or 0x00, ‘yyy’ is reset to 0xfe (254) to avoid the generation of an invalid IP address.