Chapter 3 Message and Recovery Procedures

PAGP_DUAL_ACTIVE Messages

Error Message NETWORK_PORT_SATELLITE-3-PHY_LOCKUP: Repeated phy lockup seen on [chars]. Interface will be shut down.

Note This message applies only to Catalyst 3550 switches.

Explanation PHY lockup was detected too many times in a row. The interface is shut down to avoid continuous link flapping.

Recommended Action To re-enable the interface, use the shutdown interface configuration command, followed by the no shutdown interface configuration command.

Note NETWORK_PORT_SATELLITE-6-MAC_LOCKUP: Transmit lock up is detected in

[chars]. This message applies only to Catalyst 3550 switches.

Error Message NETWORK_PORT_SATELLITE-6-MAC_LOCKUP: Transmit lock up is detected in [chars]. This port is administratively down.

Note This message applies only to Catalyst 3550 switches.

Explanation When the PHY is powered on and off, the MAC cycles from 1000 to 100 Mb/s, and the port might lock up and stop sending packets. The PHY refers to the physical layer device on the switch, which sends and receives optical signals and provides framing and line integrity. [chars] is the interface name.

Recommended Action Shut down the port by using the shutdown interface configuration command, and bring it back up by using the no shutdown interface configuration command.

PAGP_DUAL_ACTIVE Messages

This section contains Port Aggregation Protocol (PAgP) dual-active detection messages.

Error Message %PAGP_DUAL_ACTIVE-3-RECOVERY_TRIGGER: PAgP running on [chars]

informing virtual switches of dual-active: new active id [enet], old id [enet]

Explanation PAgP received a new active ID on the specified interface, which means that all virtual switches are in a dual-active scenario. The interface is informing virtual switches of this, which causes one switch to go into recovery mode. [chars] is the interface. The first [enet] is the new active ID. The second [enet] is the ID that it replaces.

Recommended Action No action is required.

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

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Cisco Systems 3750 manual Pagpdualactive 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.