Chapter 3 Message and Recovery Procedures

DOT1Q_TUNNELLING Messages

Error Message DHCP_SNOOPING_CAT3550-3-UNEXPECTED_EVENT: Process received unknown event (major [hex], minor [hex]).

Note This message applies to only Catalyst 3550 switches.

Explanation A process received an event it was unable to handle.

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.

DOT1Q_TUNNELLING Messages

This section contains the IEEE 802.1Q tunneling message. An incorrect maximum transmission unit (MTU) setting causes these message.

Error Message DOT1Q_TUNNELLING-4-MTU_WARNING: System MTU of [dec] might be insufficient for 802.1Q tunnelling. 802.1Q tunnelling requires system MTU size of [dec] to handle maximum size ethernet frames.

Note This message applies only to Catalyst 3550 switches.

Explanation The switch MTU setting might not be sufficient for IEEE 802.1Q tunneling. The MTU needs to include the 4-byte overhead associated with the additional IEEE 802.1Q tag. The first [dec] is the current system MTU setting in bytes, and the second [dec] is the required MTU size in bytes.

Recommended Action Adjust the system MTU for the additional IEEE 802.1Q tag by using the system mtu global configuration command, and reload the switch by using the reload privileged EXEC command.

DOT1X Messages

This section contains the IEEE 802.1x messages.

Error Message DOT1X-4-MEM_UNAVAIL: Memory was not available to perform the 802.1X action.

Explanation The system memory is not sufficient to perform the IEEE 802.1x authentication.

Recommended Action Reduce other system activity to reduce memory demands.

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

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Cisco Systems 3750 manual DOT1QTUNNELLING Messages, DOT1X Messages, This section contains the Ieee 802.1x 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.