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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Enabling STP/RSTP

Enabling STP/RSTP

Context

Before enabling STP/RSTP, ensure that you have performed all basic configurations, such as the device priority and port priority, on the device and its ports. After STP/RSTP is enabled on a ring network, spanning tree calculation starts immediately on the network. Making changes to configurations will affect spanning tree calculation and may cause network flapping.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run stp enable

    STP/RSTP is enabled on the device.

    By default, STP/RSTP is enabled on a device. If you specify a VLANIF interface of a VLAN as the management network interface for an STP/RSTP-enabled device, you can run the ethernet-loop-protection ignored-vlan command to specify this VLAN as an ignored VLAN. Then interfaces in the ignored VLAN will not enter the Blocking state and stay in Forwarding state. Therefore, services will not be interrupted on these interfaces.

Follow-up Procedure

When the topology of a spanning tree changes, the forwarding paths for associated VLANs are changed. Devices need to update the ARP entries corresponding to those VLANs. Depending on how devices process ARP entries, STP/RSTP convergence mode can be fast or normal.

  • In fast mode, ARP entries to be updated are directly deleted.

  • In normal mode, ARP entries to be updated are rapidly aged.

    The remaining lifetime of ARP entries to be updated is set to 0 to immediately age the ARP entries out. If the number of ARP aging probes is greater than 0, the device performs aging probe for these ARP entries.

Run the stp converge { fast | normal } command in the system view to configure the STP/RSTP convergence mode.

By default, the normal STP/RSTP convergence mode is used. The normal mode is recommended. If the fast mode is used, ARP entries will be frequently deleted, causing a high CPU usage (even 100%). As a result, network flapping will frequently occur.

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Updated: 2019-01-18

Document ID: EDOC1100038843

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