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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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Configuring the Topology Change Notification Function

Configuring the Topology Change Notification Function

Context

If an upper-layer Layer 2 network is not notified of the topology change in an ERPS ring, the MAC address entries remain unchanged on the upper-layer network and therefore user traffic is interrupted. To ensure nonstop traffic transmission, configure the topology change notification function and specify the ERPS rings that will be notified of the topology change.

In addition, if an ERPS ring frequently receives topology change notifications, its nodes will have lower CPU processing capability and repeatedly update Flush-FDB packets, consuming much bandwidth. To resolve this problem, set the topology change protection interval at which topology change notifications are sent to suppress topology change notification transmission, and set the maximum number of topology change notifications that can be processed during the topology change protection interval to prevent frequent MAC address and ARP entry updates.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run erps ring ring-id

    The ERPS ring view is displayed.

  3. Run tc-notify erps ring { ring-id1 [ to ring-id2 ] } &<1-10>

    The ERPS ring is configured to notify other ERPS rings of its topology change.

    ring-id1 [ to ring-id2 ] specifies the start and end ring IDs of the ERPS rings that will be notified of the topology change. Ensure that the ERPS rings specified by ring-id1 and ring-id2 exist. If the specified rings do not exist, the topology change notification function does not take effect.

    After the ERPS rings receive the topology change notification from an ERPS ring, they send Flush-FDB messages on their separate rings to instruct their nodes to update MAC addresses so that user traffic is not interrupted.

  4. (Optional) Run tc-protection interval interval-value

    The topology change protection interval at which topology change notification messages are sent is set.

  5. (Optional) Run tc-protection threshold threshold-value

    The number of times ERPS parses topology change notifications and updates forwarding entries in the topology change protection interval is set.

    The topology change protection interval is the one specified by the tc-protection interval command.

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Updated: 2019-01-18

Document ID: EDOC1100038843

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