SPANTREE-2-CHNL_MISCFG: Detected loop due to etherchannel misconfiguration of [chars] [chars]

Explanation This message means that a loop that caused the misconfiguration of a channel group has been detected. An example of such a misconfiguration would be when the ports on one side of the EtherChannel either are not configured to be in the channel or failed to bundle for some reason. The other side has successfully bundled the ports into the EtherChannel.

Response Determine which local ports are involved by using the show interfaces status err-disabledprivileged EXEC command, and then verify EtherChannel configuration on the remote device by using the show etherchannel summary user EXEC command on the remote device. When the configuration is corrected, enter shutdown and no shutdown interface configuration commands on the associated port- channel interface.

SPANTREE-2-LOOPGUARD_BLOCK: Loop guard blocking port [chars] on [chars].

Explanation This message means that the spanning-tree message age timer has expired because no bridge protocol data units (BPDUs) were received from the designated bridge. Because this condition could be caused by a unidirectional-link failure, the interface is put into the blocking state and marked as loop-guard-inconsistent to prevent possible loops from being created. The first [chars] is the name of this port, and the second [chars] is the spanning-tree mode displayed in the show spanning-treeprivileged EXEC command.

Response Enter the show spanning-tree inconsistentports privileged EXEC command to review the list of interfaces with loop-guard inconsistencies. Determine why devices connected to the listed ports are not sending BPDUs. One reason might be that they are not running the Spanning Tree Protocol (STP). If so, you should disable loop guard on the inconsistent interfaces by using the spanning-tree guard none interface configuration command or by starting STP on the remote side of the links.

SPANTREE-2-LOOPGUARD_CONFIG_CHANGE: Loop guard [chars] on port [chars] on [chars].

Explanation This message means that the spanning-tree loop-guard configuration for the listed interface has been changed. If enabled, the interface is placed into the blocking state. It is marked as loop- guard-inconsistent when the message-age timer expires because no BPDUs were received from the designated bridge. This feature is mainly used to detect unidirectional links. The first [chars] is the loop- guard state (enable or disable), the second [chars] is the interface name, and the third [chars] is the spanning-tree instance.

Response Verify that this is the desired configuration for the listed interface. Correct it if this is not the desired configuration; otherwise, no further action is required.

SPANTREE-2-LOOPGUARD_UNBLOCK: Loop guard unblocking port [chars] on [chars].

Explanation This message means that the listed interface has received a BPDU, and, therefore, if the inconsistency was caused by a unidirectional link failure, the problem no longer exists. The loop-guard- inconsistency is cleared for the interface, which is taken out of the blocking state, if appropriate. The first [chars] is the name of this port, and the second [chars] is the spanning-tree mode displayed in the show spanning-treeprivileged EXEC command.

Response No action is required.

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Cisco Systems Intelligent Gigabit Ethernet Switch Module manual Message and Recovery Procedures
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Intelligent Gigabit Ethernet Switch Module specifications

Cisco Systems is a leader in networking technology, and their Intelligent Gigabit Ethernet Switch Module exemplifies the innovations the company brings to the realm of networking. Designed for flexibility, performance, and scalability, the switch module is tailored for enterprise environments that require robust and reliable network infrastructure.

One of the key features of the Intelligent Gigabit Ethernet Switch Module is its support for high-speed data transfer. With Gigabit Ethernet capabilities, it enables fast and efficient communication between devices, reducing latency and increasing productivity. This high-speed connectivity supports various applications, including video streaming, VoIP, and large file transfers.

Another major characteristic of the module is its versatility. The switch module is compatible with a range of Cisco platforms, allowing users to easily integrate it into their existing network setups. This compatibility means organizations can expand their network capabilities without needing to overhaul their entire infrastructure.

Security is another prominent feature of the Intelligent Gigabit Ethernet Switch Module. It incorporates advanced security protocols, ensuring that sensitive data remains protected as it traverses the network. Features like port security, access control lists (ACLs), and network segmentation help mitigate potential risks and safeguard against unauthorized access.

The module also integrates advanced traffic management technologies. Quality of Service (QoS) features allow administrators to prioritize critical traffic, ensuring that time-sensitive applications receive the necessary bandwidth. Moreover, Layer 2 and Layer 3 capabilities enable efficient routing and switching of data, further enhancing network performance.

Energy efficiency is a hallmark of the Intelligent Gigabit Ethernet Switch Module as well. Cisco has designed the module with environmentally friendly technologies that reduce power consumption, contributing to lower operational costs and a reduced carbon footprint.

In addition, the switch module supports automation and programmability features such as Cisco’s DNA Center, which provides a centralized management platform for monitoring and controlling network activity. This capability allows for easier deployment of policies, enhancing operational efficiency.

Overall, the Cisco Systems Intelligent Gigabit Ethernet Switch Module is a powerful networking solution, combining high-speed performance, advanced security, versatile integration, and efficient management to meet the growing demands of modern enterprise networks. As organizations continue to evolve, this switch module stands out as a reliable choice for companies seeking to optimize their network infrastructure for future challenges.
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