Validate NHG update in hierarchical resolution scenario

• Connect ATE port-1 to DUT port-1, ATE port-2 to DUT port-2, ATE port-3 to DUT port-3.
• Create a non-default VRF (VRF-1) that includes DUT port-1.
• Establish gRIBI client connection with DUT and make it become leader.
• Use Modify RPC to install entries per the following order, and ensure FIB ACK is received for each of the AFTOperation:
  • Add 203.0.113.1/32 (default VRF) to NextHopGroup (NHG#42 in default VRF) containing one NextHop (NH#40 in default VRF) that specifies DUT port-2 as the egress interface and 00:1A:11:00:1A:BC as the destination MAC address.
  • Add 198.51.100.0/24 (VRF-1) to NextHopGroup (NHG#44 in default VRF) containing one NextHop (NH#43 in default VRF) specified to be 203.0.113.1/32 in the default VRF.
• Ensure that ATE port-2 receives the packets with 00:1A:11:00:1A:BC as the destination MAC address.
• Use the Modify RPC with ADD operation to test NHG implicit in-place replace (step by step as below):
  1. Add a new NH (NH#41) with egress interface that specifies DUT port-3 as the egress interface and 00:1A:11:00:1A:BC as the destination MAC address.
  2. Add the same NHG#42 but reference both NH#40 and NH#41.
  3. Validate that both ATE port-2 and ATE port-3 receives the packets with 00:1A:11:00:1A:BC as the destination MAC address.
  4. Add the same NHG#42 but reference only NH#41.
  5. Validate that only ATE port-3 receives the packets.
  6. Add the same NHG#42 but reference only NH#40.
  7. Validate that only ATE port-2 receives the packets

Repeat the above tests with one additional scenario with the following changes, and it should not change the expected test result.

• Add an empty decap VRF, DECAP_TE_VRF.
• Add 4 empty encap VRFs, ENCAP_TE_VRF_A, ENCAP_TE_VRF_B, ENCAP_TE_VRF_C and ENCAP_TE_VRF_D.
• Replace the existing VRF selection policy with vrf_selection_policy_w as in https://github.com/openconfig/featureprofiles/pull/2217

• Steps:

• Topology

  • [ATE port-1] — [port-1 DUT port-2] — [port-2 ATE] Port-3]—-[port-3 ATE] Port-4]—-[port-4 ATE]

• DUT port-2, port-3 and port-4 are each making a one-member trunk port (trunk-2 and trunk-3, trunk-4).

• Configure a destination network-a connected to trunk-2, trunk-3 and trunk-4.

• gRIBI installs the following routing structure (700 IPv4 prefix, NHG and NH numbers stays the same as the illustration), and expect FIB ACKs:

• In the DEFAULT VRF: VIP1 -> NHG#1 -> [NH#1 {mac: MagicMAC, interface: DUTPort2Trunk}, NH#2 {mac: MagicMAC, interface: DUTPort3Trunk}] NHG#10 -> NH#10 {decap, network-instance: DEFAULT VRF} NHG#20 -> [ NH#20{ip: VIP1}, backupNH: NHG#10]

• In a non-defualt VRF, VRF-1: IPv4Entries(1000 /32 IPv4 entries) -> NHG#20

• Send 10K IPinIP traffic flows from ATE port-1 to network-a.

• Validate that traffic is going via trunk-2 and trunk-3 and there is no traffic loss.

• Send one gRIBI NHG#1 update to replace NH#1 and NH#2 with NH#3 pointing to trunk#4.

• Expect FIB ACKs, and validate that all traffic are moved to trunk#4 with no traffic loss.

• Send one gRIBI NHG#1 update to revert back the changes above.

• Expect FIB ACKs and validate that the traffic is moved back to trunk-2 and trunk-3 with less than ms traffic loss.

paths:
    ## Config parameter coverage
    /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/next-hop-group:
    /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/origin-protocol:
    /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/prefix:
    /network-instances/network-instance/afts/next-hop-groups/next-hop-group/id:
    /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops/next-hop/index:
    /network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/backup-next-hop-group:
    /network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id:
    /network-instances/network-instance/afts/next-hops/next-hop/interface-ref/state/interface:
    /network-instances/network-instance/afts/next-hops/next-hop/interface-ref/state/subinterface:
    /network-instances/network-instance/protocols/protocol/static-routes/static/next-hops/next-hop/interface-ref/config/interface:
    /network-instances/network-instance/protocols/protocol/static-routes/static/next-hops/next-hop/interface-ref/config/subinterface:
    /network-instances/network-instance/afts/next-hops/next-hop/state/index:
    /network-instances/network-instance/afts/next-hops/next-hop/state/ip-address:
    /network-instances/network-instance/afts/next-hops/next-hop/state/mac-address:

    ## Protocol/RPC Parameter Coverage
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.

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