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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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What State Is an Eth-Trunk in After the Stack Split If DAD Is Not Configured for the Stack?

What State Is an Eth-Trunk in After the Stack Split If DAD Is Not Configured for the Stack?

As shown in the following figure, SwitchB and SwitchC set up a stack, and SwitchA and SwitchD are dual-homed to both SwitchB and SwitchC through Eth-Trunk links.
Figure 22-79 Networking diagram
  • If the Eth-Trunk is configured in manual mode, no loop will occur on SwitchA and SwitchD after the stack split. The traffic forwarding paths are the same as those before the stack split, for example, SwitchA -> SwitchB -> SwitchD and SwitchA -> SwitchC -> SwitchD.

  • When the Eth-Trunk is configured in static LACP mode, the traffic forwarding paths are the same before and after the stack split if the standby switch still uses the system MAC address. If the standby switch uses its own MAC address after the stack split, traffic can only be forwarded through one port and no loop will occur. This is because, in the static LACP mode, a physical member port in the Eth-Trunk goes Down and only one physical member port can go Up.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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