Ensure that traffic splits within a NextHopGroup are correctly honoured.

• Configure ATE port-1 connected to DUT port-1, and ATE port 2-9 connected to DUT port 2-9. Connect to gRIBI with persistence PRESERVE, make it become leader and flush all entries before each case.

• Via gRIBI, install an IPv4Entry for 203.0.113.0/24 pointing to a NextHopGroup id 10.

• Install next-hops corresponding to each of ATE port 2-9 from the DUT mapped to an IPv4 address, e.g., 192.0.2.2/30 corresponding to ATE port 2. For the following cases, verify (ensuring traffic with sufficient entropy - mixed IPv4 source and destination ports):

  • With NHG 10 containing 1 next hop, 100% of traffic is forwarded to the installed next-hop.

  • With NHG 10 containing 2 next hops with no associated weights assigned, 50% of traffic is forwarded to each next-hop.

  • With NHG 10 containing 8 next hops, with no associated weights assigned, 12.5% of traffic is forwarded to each next-hop.

  • With NHG 10 containing 2 next-hops, specify and validate the following ratios:

    • Weight 1:1 - 50% per-NH.
    • Weight 2:1 - 66% traffic to NH1, 33% to NH2.
    • Weight 9:1 - 90% traffic to NH1, 10% to NH2.
    • Weight 31:1 - ~96.9% traffic to NH1, ~3.1% to NH2.
    • Weight 63:1 - ~98.4% traffic to NH1, ~1.6% to NH2.

• Validate that weights of:

  • <64K are supported
  • >64K are correctly balanced if the device supports it.

• With NHG10 containing 8 next-hops, with a weight of 1 assigned to each, sequentially remove each next-hop by turning down the port at the ATE (invalidates nexthop), ensure that traffic is rebalanced across remaining NHs until only one NH remains.

• TODO: /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops/next-hop/state/weight

• gRIBI:
  • Modify()
    • ModifyRequest:
      • AFTOperation:
        • next_hop_group
          • NextHopGroupKey: id
          • NextHopGroup: weight