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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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Verifying the Configuration of M-LAG Configured Through V-STP

Verifying the Configuration of M-LAG Configured Through V-STP

Procedure

  • Run the display dfs-group dfs-group-id [ node node-id m-lag [ brief ] | peer-link ] command to check M-LAG information.
  • Run the display stp [ process process-id ] v-stp command to check the V-STP status and statistics.

Follow-up Procedure

After M-LAG is configured, if the peer-link fails but the heartbeat status is normal, some interfaces on the backup device will enter the Error-Down state. The device records the status of an interface as Error-Down when it detects that a fault occurs. The interface in Error-Down state cannot receive or send packets and the interface indicator is off. You can run the display error-down recovery command to check information about all interfaces in Error-Down state on the device.

When M-LAG is used for dual-homing to an Ethernet, VXLAN network, or IP network and the peer-link fails but the heartbeat is normal, all physical interfaces except the management interface, peer-link interface, and stack interface on the backup device will enter the error-down state. When the peer-link recovers, the M-LAG interface in Error-Down state becomes Up after 2 minutes by default, and the physical interfaces in Error-Down state are restored to Up state.

When the interface enters the Error-Down state, locate the cause. You are not advised to manually restore the interface or run the error-down auto-recovery cause m-lag interval interval-value command in the system view to enable the interface to go Up automatically. Otherwise, packet loss or forwarding failure may occur. Exercise caution when you perform the preceding operation.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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