ipv6_entry_test

TE-2.3: gRIBI IPv6 Entry with Prefix Length > 64

Summary

Validate IPv6 route entry support in gRIBI, specifically focusing on IPv6 prefixes with prefix length strictly greater than 64 bits (such as /65, /96, /126, /127, and /128). This verifies that the device agent (DA) and underlying switch ASIC (e.g. TCAM / ALPM paired memory tables) correctly program and forward traffic for longer IPv6 prefixes without prefix bitmask truncation, incorrect table allocation, or route lookup failures.

Testbed type

• TESTBED_DUT_ATE_4LINKS

Procedure

• Connect ATE port-1 to DUT port-1, ATE port-2 to DUT port-2, and ATE port-3 to DUT port-3.
• Establish gRIBI client connection with DUT, negotiating RIB_AND_FIB_ACK as the requested ack_type and persistence mode PRESERVE. Make it become leader. Flush all entries after each case.

Test Cases

• Using gRIBI Modify RPC install the following IPv6Entry sets, and validate the specified behaviours:
  • Single next-hop with prefix length > 64:
    • Install 2001:db8:100::/65 to NextHopGroup containing one NextHop specified to ATE port-2.
    • Forward packets from ATE port-1 destined to 2001:db8:100::/65 and verify 100% traffic arrives on ATE port-2 with 0% traffic loss.
  • Multiple next-hops (ECMP) with prefix length > 64:
    • Install 2001:db8:100::/65 to NextHopGroup containing two NextHop entries specified to ATE ports 2 and 3.
    • Forward packets destined to 2001:db8:100::/65 and verify traffic is balanced across ATE ports 2 and 3.
  • Multiple next-hops with MAC override with prefix length > 64:
    • Install 2001:db8:100::/65 to NextHopGroup containing NextHops with destination MAC override, and verify traffic forwards successfully without packet loss.
  • Non-existent next-hop with prefix length > 64:
    • Send Modify() installing 2001:db8:100::/65 referencing next-hops that do not exist. Validate that FAILED error is received and traffic is dropped.
  • Downed next-hop interface with prefix length > 64:
    • Install 2001:db8:100::/65 to NextHopGroup with NextHops on port 2 and port 3.
    • Set link state down on port 2.
    • Forward packets and verify 100% traffic reroutes to port 3 without packet loss.
  • Longest Prefix Match (LPM) Discrimination (/64 vs /65):
    • Install 2001:db8:200::/64 -> NextHop(ATE port-2).
    • Install 2001:db8:200::/65 -> NextHop(ATE port-3).
    • Send Flow 1 destined to 2001:db8:200::1/128 (matches /64 and /65) -> verify it arrives on ATE port-3 due to LPM.
    • Send Flow 2 destined to 2001:db8:200:0:8000::1/128 (matches /64 but has bit 65 = 1, so outside /65) -> verify it arrives on ATE port-2.
  • Boundary Prefix Length Sweep (/65, /96, /126, /127, /128):
    • Install and verify forwarding for boundary prefixes:
      • /65 (2001:db8:101::/65)
      • /96 (2001:db8:102::/96)
      • /126 (2001:db8:103::/126)
      • /127 (2001:db8:104::/127)
      • /128 (2001:db8:105::1/128)
    • Verify zero packet loss for each prefix length to ensure hardware table allocation succeeds across all bit boundaries.
  • Route Deletion and Flush:
    • Verify route removal and FlushAll cleanly clears all IPv6 entries from FIB.

Config Parameter coverage

N/A

Telemetry Parameter coverage

N/A

Protocol/RPC Parameter coverage

• gRIBI
  • Modify()
    • ModifyRequest:
      • AFTOperation:
        • id
        • network_instance
        • op
        • Ipv6
          • Ipv6EntryKey: prefix
          • Ipv6Entry: next_hop_group
        • next_hop_group
          • NextHopGroupKey: id
          • NextHopGroup: next_hop
        • next_hop
          • NextHopKey: id
          • NextHop:
            • ip_address
    • ModifyResponse:
      • AFTResult:
        • id
        • status

OpenConfig Path and RPC Coverage

paths:
  /interfaces/interface/config/description:
  /interfaces/interface/config/enabled:
  /interfaces/interface/config/name:
  /interfaces/interface/config/type:
  /interfaces/interface/ethernet/config/port-speed:
  /interfaces/interface/subinterfaces/subinterface/ipv4/addresses/address/config/ip:
  /interfaces/interface/subinterfaces/subinterface/ipv4/addresses/address/config/prefix-length:
  /interfaces/interface/subinterfaces/subinterface/ipv4/neighbors/neighbor/config/link-layer-address:
  /interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/config/ip:
  /interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/config/prefix-length:
  /interfaces/interface/subinterfaces/subinterface/ipv6/neighbors/neighbor/config/link-layer-address:
  /interfaces/interface/subinterfaces/subinterface/ipv6/config/enabled:
  /network-instances/network-instance/interfaces/interface/config/id:
  /network-instances/network-instance/interfaces/interface/config/interface:
  /network-instances/network-instance/interfaces/interface/config/subinterface:
  /network-instances/network-instance/protocols/protocol/config/identifier:
  /network-instances/network-instance/protocols/protocol/config/name:
  /network-instances/network-instance/protocols/protocol/static-routes/static/config/prefix:
  /network-instances/network-instance/protocols/protocol/static-routes/static/next-hops/next-hop/config/index:
  /network-instances/network-instance/protocols/protocol/static-routes/static/next-hops/next-hop/interface-ref/config/interface:
rpcs:
  gnmi:
    gNMI.Get:
    gNMI.Set:
    gNMI.Subscribe:
  gribi:
    gRIBI.Flush:
    gRIBI.Get:
    gRIBI.Modify:

Canonical OC

{
  "network-instances": {
    "network-instance": [
      {
        "name": "DEFAULT",
        "config": {
          "name": "DEFAULT"
        }
      }
    ]
  }
}