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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) Setting the LACP System ID and MAC Address in Layer 3 Mode

(Optional) Setting the LACP System ID and MAC Address in Layer 3 Mode

Context

When devices are connected through Eth-Trunk interfaces in LACP mode, the device with a higher LACP system priority functions as the LACP Actor. The other device then selects active member interfaces based on the interface priorities of the LACP Actor. If the two connected devices have the same LACP system priority, the LACP system IDs determine the device priorities. To configure an LACP system ID, run the lacp system-id command. The device with a higher priority then becomes the LACP Actor. The other device then selects active member interfaces based on the interface priorities of the LACP Actor.

If a local Eth-Trunk interface and a peer Eth-Trunk interface on the same device interconnect to form a self-loop and no LACP system ID is configured, the LACP system ID of each Eth-Trunk interface is the system bridge MAC address. After the peer Eth-Trunk interface receives an LACPDU from the local Eth-Trunk interface, the LACP negotiation fails because the LACP system ID remains the system bridge MAC address. As a result, the Eth-Trunk interfaces both go Down. To resolve this issue, run the lacp system-id command to configure different LACP system IDs for the Eth-Trunk interfaces so that the LACP negotiation succeeds and the Eth-Trunk interfaces both go Up.

In this scenario, two Layer 3 Eth-Trunks of the device use the bridge MAC address by default. When the MAC address is the same, the Layer 3 protocol cannot work. To ensure that Layer 3 traffic is forwarded normally, configure the MAC address in Layer 3 mode for at least one Eth-Trunk so that the two Eth-Trunks use different MAC addresses.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The member interface view is displayed.

  3. Run lacp system-id mac-address

    The LACP system ID of the member interface is configured.

    By default, the LACP system ID of an Eth-Trunk interface is the system bridge MAC address.

    The lacp system-id and lacp m-lag system-id commands are mutually exclusive.

  4. (This step is mandatory when Layer 3 traffic needs to be forwarded.) Configure the MAC Address for an Eth-Trunk in Layer 3 Mode.
    1. Run undo portswitch

      The Eth-Trunk changes to the Layer 3 mode.

      By default, an Eth-Trunk works in Layer 2 mode.

    2. Run mac-address mac-address

      The MAC address of the Eth-Trunk is configured.

      By default, an Eth-Trunk uses the system MAC address.

  5. Run commit

    The configuration is committed.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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