No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring Loop Protection on a Port

Configuring Loop Protection on a Port

Context

On an RSTP network, a switching device maintains the states of the root port and blocked ports based on BPDUs received from an upstream switching device. If the switching device cannot receive BPDUs from the upstream because of link congestion or unidirectional-link failure, the switching device selects a new root port. The original root port becomes a designated port, and the original blocked ports change to the Forwarding state, which may cause loops on the network. To prevent this problem, configure loop protection.

If the root port or alternate port does not receive BPDUs from the upstream device for a specified period, a switch enabled with loop protection sends a notification to the NMS. If the root port is used, the root port enters the Discarding state and becomes the designated port. If the alternate port is used, the alternate port remains blocked and becomes the designated port. In this case, loops will not occur. After the link is no longer congested or unidirectional link failures are rectified, the port receives BPDUs for negotiation and restores its original role and status.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number

    The view of the root port or alternate port is displayed.

  3. Run:

    stp loop-protection

    Loop protection is enabled on the root port or alternate port.

    By default, loop protection is disabled on a port.

    NOTE:

    An alternate port is a backup for a root port. If a switching device has an alternate port, configure loop protection on both the root port and the alternate port.

    Root protection and loop protection cannot be configured on the same port.

Translation
Download
Updated: 2019-08-21

Document ID: EDOC1000142081

Views: 255231

Downloads: 408

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next