Chapter 3 Message and Recovery Procedures

ETHCNTR Messages

Error Message ETHCNTR-3-LOOP_BACK_DETECTED:, Loop-back detected on [chars]. The port is forced to linkdown.

Explanation This message occurs when a keepalive packet is looped back to the port that sent the keepalive. The loopback condition might be caused by a balun cable being accidentally connected to the port, or there might be a loop in the network. [chars] is the port.

Recommended Action Examine the cables. If a balun cable is connected, and the loopback condition is desired, no action is required. Otherwise, connect the correct cable, and bring the port up by entering the no shutdown interface configuration command. We do not recommend using the no keepalive interface command to disable keepalives. The cause of this network loop must be found and corrected. Although disabling keepalives prevents the port from being error disabled, it does not resolve the cause of the problem and can affect network stability. See CSCea46385 for more information.

Error Message ETHCNTR-3-MOLSENDINT: Molecule send from interrupt handler

Note This message applies only to Catalyst 3550 switches.

Explanation An interrupt handler is accessing the hardware in an impermissible manner.

Recommended Action Find out more about the error by using the show tech-supportprivileged EXEC command and by copying the error message exactly as it appears on the console or system log and entering it in the Output Interpreter tool. Use the Bug Toolkit to look for similar reported problems. For more information about these online tools and about contacting Cisco, see the “Error Message Traceback Reports” section on page 2-7for more information.

Error Message ETHCNTR-3-NETWORK_ERROR: Frame received on queue [dec] contained network error. Source thread [dec], source interface [chars].

Note This message applies only to Catalyst 3550 switches.

Recommended Action The frame that is stored on the switch has an error. The first [dec] is the ingress queue, the second [dec] is the source thread, and [chars] is the ingress interface.

Recommended Action Copy the message exactly as it appears on the console or in the system log. Research and attempt to resolve the error by using the Output Interpreter. Use the Bug Toolkit to look for similar reported problems. If you still require assistance, open a case with the TAC, or contact your Cisco technical support representative, and provide the representative with the gathered information. For more information about these online tools and about contacting Cisco, see the “Error Message Traceback Reports” section on page 2-7.

Error Message ETHCNTR-3-NO_HARDWARE_RESOURCES: Not enough hardware resources. Shutting down [chars].

Note This message applies only to Catalyst 3750, 3560, 2975, 2970, and 2960 switches.

Catalyst 3750, 3560, 3550, 2975, 2970, and 2960 Switch System Message Guide

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Cisco Systems 3750 manual Message and Recovery Procedures Ethcntr Messages

3750 specifications

The Cisco Systems 3750 series is a family of enterprise-class stackable switches that were designed to provide high-performance networking solutions for organizations requiring robust management features, security, and scalability. Known for their reliability and advanced capabilities, the 3750 series is particularly aimed at accommodating the demands of LAN environments in organizations ranging from small businesses to large enterprises.

One of the defining features of the Cisco 3750 series is its StackWise technology. This innovative feature enables the stacking of up to nine switches together, allowing them to function as a single logical unit. This results in simplified management, higher redundancy, and increased scalability. The StackWise technology allows for seamless failover and enhanced bandwidth between the stacked switches.

In terms of performance, the 3750 series supports Layer 2 and Layer 3 switching, offering routing capabilities to handle both traditional and modern network demands. It is equipped with advanced Quality of Service (QoS) features, ensuring that critical applications such as voice and video are prioritized for optimal performance.

The Cisco 3750 also features extensive security capabilities. It incorporates features such as IEEE 802.1X authentication, DHCP snooping, and dynamic ARP inspection to protect against unauthorized access and various network attacks. These enhancements help maintain data integrity and secure communications across the network.

Another noteworthy characteristic of the 3750 series is its support for Power over Ethernet (PoE). PoE allows for the delivery of power over Ethernet cables to connected devices, such as IP phones and wireless access points, facilitating simpler installations and reducing the need for additional power outlets.

The Cisco 3750 series also provides a comprehensive set of management tools. With features like Cisco's Embedded Event Manager (EEM) and extensive SNMP support, network administrators can efficiently monitor and manage network performance, troubleshoot issues, and maintain high availability.

Additionally, the series is compatible with Cisco's IOS software, which provides a rich set of features, including advanced routing protocols, multicast support, and extensive security options, further enhancing the functionality and versatility of the switches.

Overall, the Cisco Systems 3750 series stands out for its stackable design, high-performance features, security capabilities, and management tools, making it a popular choice for organizations looking for dependable and scalable networking solutions.