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Configuring Ethernet Media (CTP Menu)

You can configure the CTP Ethernet media to autonegotiate the duplex mode and speed and to set the speed to either 100 or 10 Mbps. The Ethernet configurations on the CTP device must match the configuration of the connected router or switch. Mismatched configurations, such as setting the CTP system to autonegotiate and the router to full duplex, may result in a misconfiguration and dropped packets. You must disable Cisco Discovery Protocol on the Fast Ethernet port connected to the CTP system.

To configure Ethernet interfaces on a CTP device using the CTP Menu:

  1. From the Main Menu, select 5) Node Operations.
  2. Display the current Ethernet configuration by selecting 12) Config ethernet media.

    Autonegotiation is enabled by default and the speed is set to 1000 Mbps

    Field Function Your Action

    Please input the device to configure the media for

    Specifies the Ethernet port

    Specify an Ethernet port from the list.

    Configure eth0 (e1000) for autonegotiation

    Specifies whether autonegotiation is enabled. The default speed for autonegotiation is 1000 Mbps.

    Specify y or n.

    If you specify y, autonegotiation is enabled and the speed is set to 1000 Mbps.

    If you specify n, the system prompts you to set the speed to 100 Mbps.

    Configure eth0 for 100 Mbps

    Specifies the speed. This field is not displayed if autonegotiation is enabled.

    Specify y or n. If you specify y, the system sets the speed to 100 Mbps.

    If you specify n, the speed is set to 10 Mbps.
  3. Specify the Ethernet device you want to configure, and follow the onscreen instructions.

If the autonegotiation setting of the CTP Ethernet media and the far-end switch or router do not match, it is possible for the CTP Ethernet ports to be in a half-duplex state, although the duplex setting is not configurable and always assumed to be full-duplex on the CTP device. Starting with CTPOS and CTPView Release 7.2, the half-duplex state at CTP network interface card (NIC) ports are acquired, regardless of the duplex setting configured on the far-end node. After the autonegotiation process is completed, if the CTP NIC cannot acquire full-duplex mode, then the interfaces are considered to be down and a log message is recorded in both the /var/log/messages directory and the syslog file stating that the interface is down due to a non-full duplex condition. You are prompted to verify the cable connection, speed, and duplex settings because the NIC link might be down.

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