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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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(Optional) Enabling State Flapping Suppression on an Eth-Trunk

(Optional) Enabling State Flapping Suppression on an Eth-Trunk

Context

  • If the state of an Eth-Trunk frequently flaps, the LACP protocol status of the Eth-Trunk also flaps, affecting the Eth-Trunk operations. To resolve this problem, enable the state flapping suppression function on the Eth-Trunk working in LACP mode.
  • After LACP negotiation succeeds on an Eth-Trunk interface, the interface will save the source MAC address of the most recently received packet, and will check the source MAC addresses of packets. If the Eth-Trunk interface receives a packet with the source MAC address being different from the one which saved, the Eth-Trunk may be flapped because the once more negotiation.

    To prevent an Eth-Trunk interface from alternating between Up and Down, enable the invalid-MAC-based flapping suppression function on the Eth-Trunk interface working in LACP mode. After this function is enabled, the Eth-Trunk interface drops the packet and records the packet information if receiving a packet with the source MAC address being different from the valid one. In this manner, the Eth-Trunk interface does not alternate between Up and Down even if packet flapping occurs.

Procedure

  • Enable the state flapping suppression function on an Eth-Trunk.
    1. Run system-view

      The system view is displayed.

    2. Run interface eth-trunk trunk-id

      The Eth-Trunk interface view is displayed.

    3. Run lacp dampening state-flapping

      The state flapping suppression function is enabled on the Eth-Trunk.

      By default, the state flapping suppression function is disabled on an Eth-Trunk.

    4. Run commit

      The configuration is committed.

  • Enable the invalid-MAC-based state flapping suppression function on an Eth-Trunk.
    1. Run system-view

      The system view is displayed.

    2. Run interface eth-trunk trunk-id

      The Eth-Trunk interface view is displayed.

    3. Run undo lacp dampening unexpected-mac disable

      The invalid-MAC-based state flapping suppression function is enabled on the Eth-Trunk.

      By default, the invalid-MAC-based state flapping suppression function is enabled on an Eth-Trunk.

    4. Run commit

      The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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