backup_nhg_action

TE-11.3: Backup NHG: Actions

Summary

Validate gRIBI Backup NHG actions.

Topology

• Connect ATE port-1 to DUT port-1, ATE port-2 to DUT port-2, ATE port-3 to DUT port-3, and ATE port-4 to DUT port-4.
• Create a 3 non-default VRF:
  • VRF-A that includes DUT port-1.
  • VRF-B that includes no interface.
  • VRF-C that includes no interface.
• OuterDstIP_1, OuterSrcIP_1, OuterDstIP_2, OuterSrcIP_2: IPinIP outer IP addresses.
• InnerDstIP_1, InnerSrcIP_1: IPinIP inner IP addresses.
• VIP_1, VIP_2: IP addresses used for recursive resolution.
• ATEPort2IP: testbed assigned interface IP to ATE port 2
• ATEPort3IP: testbed assigned interface IP to ATE port 3
• All the NHG and NH objects injected by gRIBI are in the DEFAULT VRF.

Setups

Different test scenarios requires different setups.

• Setup#1

  • Make sure DUT port-2, port-3 and port-4 are up.

  • Make sure there is a static route in the default VRF for InnerDstIP_1, pointing to ATE port-4.

  • Connect a gRIBI client to DUT with session parameters {persistence=PRESERVE Redundancy=SINGLE_PRIMARY}

  • gRIBI Flush the DUT.

  • Inject the following gRIBI structure to the DTU:

    VIP_1/32 {DEFAULT VRF} --> NHG#1 --> NH#1 {next-hop: ATEPort2IP}
    NHG#100 --> NH#100 {decap, network-instance:DEFAULT}
    NHG#101 --> [NH#101 {next-hop: VIP1}, backupNHG: NHG#100]
    OuterDstIP_1/32 {VRF-A} --> NHG#101
    

• Setup#2

  • Make sure DUT port-2, port-3 and port-4 are up.

  • Make sure there is a static route in the default VRF for InnerDstIP_1, pointing to ATE port-4.

  • Connect a gRIBI client to DUT with session parameters {persistence=PRESERVE Redundancy=SINGLE_PRIMARY}

  • gRIBI Flush the DUT.

  • Inject the following gRIBI structure to the DTU:

    VIP_1/32 {DEFAULT VRF} --> NHG#1 --> NH#1 {next-hop: ATEPort2IP}
    VIP_2/32 {DEFAULT VRF} --> NHG#2 --> NH#2 {next-hop: ATEPort3IP}
    
    NHG#100 --> NH#100 {network-instance:VRF-B}
    NHG#101 --> [NH#101 {next-hop: VIP1}, backupNHG: NHG#100]
    OuterDstIP_1/32 {VRF-A} --> NHG#101
    
    NHG#103 --> NH#103 {decap, network-instance:DEFAULT}
    NHG#102 --> [NH#102 {decap-encap, src:`OuterSrcIP_2`, dst:`OuterDstIP_2`, network-instance: VRF-C}, backupNHG: NHG#103]
    OuterDstIP_1/32 {VRF-B} --> NHG#102
    
    NHG#104 --> [NH#104 {next-hop: VIP-2}, backupNHG: NHG#103]
    OuterDstIP_2/32 {VRF-C} --> NHG#104
    

Procedure

• TEST#1 - (next-hop viability triggers decap in backup NHG):

  1. Deploy Setup#1 as above.

  2. Send IPinIP traffic to OuterDstIP_1 with inner IP as InnerDstIP_1, and validate that ATE port-2 receives the IPinIP traffic.

  • Shutdown DUT port-2 interface, and validate that ATE port-4 receives the decapsulated traffic with InnerDstIP_1.

• Test#2 - (tunnel viability triggers decap and encap in the backup NHG):

  • Deploy Setup#2 as above.

  • Send IPinIP traffic to OuterDstIP_1. Validate that ATE port-2 receives the IPinIP traffic with outer IP as OuterDstIP_1.

  • Shutdown DUT port-2 interface, and validate that ATE port-3 receives the IPinIP traffic with outer destination IP as OuterDstIP_2, and outer source IP as OuterSrcIP_2

  • Shutdown DUT port-3 interface, and validate that ATE port-4 receives the traffic with decapsulated traffic with destination IP as InnerDstIP_1 at ATE port-4.

OpenConfig Path and RPC Coverage

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

Minimum DUT platform requirement

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