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Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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LACP fallback in non-VLT network

In a non-VLT network, LACP fallback enables rebooting of ToR or server that is connected to the switch through normal LACP. The other end of the switch is connected to a DHCP/PXE server, as shown in the following figure:

LACP fallback in non-VLT network
In the above scenario, LACP fallback works as follows:
  1. The ToR/server boots
  2. The switch detects the link that is up and checks fallback enabled status. If fallback is enabled, the device waits for the time-out period for any LACP BPDUs. If there are no LACP BPDUs received within the time period, then the LAG enters into fallback mode and adds the first operationally UP port to the port channel instead of placing it in an inactive state.
  3. Now the ToR/server has one port up and active. The active port sends packets to the DHCP/PXE server.
  4. After receiving response from the DHCP server, the ToR/server boots from the TFTP/NFS server.
  5. When the ToR/server is fully loaded with the boot image and configurations, the server starts sending LACP PDUs.
  6. When the switch receives LACP PDUs from ToR/server, the device comes out of the fallback mode and activates the LAG through normal LACP process.

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