Ensure that backup NextHopGroup entries are honoured in gRIBI for NHGs containing a single NH.

• Connect ATE port-1 to DUT port-1, ATE port-2 to DUT port-2, and ATE port-3 to DUT port-3.

• Create a non-default VRF-B that contains no interfaces.

• Connect gRIBI client to DUT with persistence PRESERVE, redundancy SINGLE_PRIMARY, with election ID 1.

• Install the following gRIBI structure: (if not specifically mentioned, the objects are installed in the DEFAULT VRF)

• NHG#1 --> NH#1 {next-hop: ATEPort2IP}

• NHG#2 --> NH#2 {next-hop: ATEPort3IP}

• 192.0.2.254/32 --> NHG#1

• NHG#100 --> NH#100 {network-instance:VRF-B}

• NHG#101 --> [NH#101 {next-hop: 192.0.2.254}, backupNHG: NHG#100]

• 198.51.100.0/32 {DEFAULT} --> NHG#101

• 198.51.100.0/32 {VRF-B} --> NHG#2

• Validate:

  • AFT telemetry shows the installed NHGs and NHs.
  • Traffic is forwarded to ATE port-2 from ATE port-1.

• For each of the following cases, ensure that traffic switches to being forwarded to ATE port-3:

  • Interface ATE port-2 is disabled.
  • Interface DUT port-2 is disabled.

• Remove the entry for 192.0.2.254/32.

rpcs:
  gnmi:
    gNMI.Get:
    gNMI.Set:
    gNMI.Subscribe:
  gribi:
    gRIBI.Get:
    gRIBI.Modify:
    gRIBI.Flush:

vRX if the vendor implementation supports FIB-ACK simulation, otherwise FFF.