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Github Action edited this page Nov 18, 2022 · 3 revisions

TE-3.2: Traffic Balancing According to Weights

Summary

Ensure that traffic splits within a NextHopGroup are correctly honoured.

Procedure

  • 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.

Telemetry Parameter Coverage

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

Protocol/RPC

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