afts_atomic

AFT-3.1: AFTs Atomic Flag Check

Summary

This test verifies that the atomic flag is correctly set in gNMI subscription notifications for the AFT (Abstract Forwarding Table) paths during network churn events. The atomic flag is expected to be true for the initial synchronization and for updates that occur after a link comes back up, and false for delete notifications when a link goes down.

Testbed

• featureprofiles/topologies/atedut_2.testbed

Test Setup

Generate DUT and ATE Configuration

Variables

• Let X be the number of IPv4 prefixes to be advertised by eBGP. (User Adjustable Value)
• Let Y be the number of IPv6 prefixes to be advertised by eBGP. (User Adjustable Value)
• Let Z be the number of IPv4 prefixes to be advertised by IS-IS. (User Adjustable Value)
• Let Z1 be the number of IPv6 prefixes to be advertised by IS-IS. (User Adjustable Value)

The default value is 200 for all BGP variables, and 100 for all ISIS variables.

Configure IS-IS session.

• Configure DUT:port1,port2 for IS-IS session with ATE:port1,port2.
• IS-IS must be level 2 only with wide metric.
• IS-IS must be point to point.
• Send Z IPv4 and Z1 IPv6 prefixes from ATE:port1 to DUT:port1.
• Each prefix advertised by ISIS must have one next hop pointing to ATE port1.

Configure eBGP multipath sessions.

• Configure eBGP over the interface IP between ATE:port1,port2 and DUT:port1,port2.
• eBGP DUT AS is 65501 and peer AS is 200.
• eBGP is enabled for address family IPv4 and IPv6.
• Advertise X IPv4 and Y IPv6 prefixes from ATE port1,port2.
• Each prefix advertised by eBGP must have 2 next hops pointing to ATE port1 and ATE port2.

Procedure

• Use gNMI.UPDATE option to push the Test Setup configuration to the DUT.
• ATE configuration must be pushed.
• After configuration, establish a gNMI Subscribe stream for the /network-instances/network-instance/afts path with ON_CHANGE mode.

Verifications

• Initial Synchronization:
  • Verify that eBGP sessions are in the ESTABLISHED state.
  • The first set of gNMI notifications received on the subscription stream represents the initial synchronization of the AFT state.
  • Verify that these are all update notifications.
  • Verify that every update notification in this initial batch has the atomic flag set to true.
  • Ensure all expected BGP and ISIS routes are present in the AFT once the initial sync is complete.

AFT-3.1.1: AFT Atomic Flag check scenario 1

Procedure

Bring down the link between ATE:port2 and DUT:port2 using OTG API.

Verifications

• Verify all the notifications sent from the DUT for the paths mentioned in the path section have atomic flag set to true for updates, and not present for deletes.

AFT-3.1.2: AFT Atomic Flag Check Link Down and Up scenario 2

Procedure

1. Bring down both links between ATE:port1,port2 and DUT:port1,port2 using OTG API.
2. After verifications, bring up both links using OTG API.

Verifications

• After Bringing Links Down:
  • Verify that delete notifications are received on the gNMI stream remove all previously learned BGP and ISIS routes.
  • Verify that the atomic flag is not present for all delete notifications.
  • Confirm that the eBGP and ISIS routes are removed from the DUT's RIB and FIB (query results should be nil).
• After Bringing Links Up:
  • Verify that eBGP sessions are re-established.
  • A new set of update notifications should be received for all BGP and ISIS routes.
  • Verify that the atomic flag is set to true on these update notifications.
  • Confirm that all routes are correctly re-installed in the RIB and FIB with their respective next-hops.

Canonical OC

{
  "network-instances": {
    "network-instance": [
      {
        "name": "DEFAULT",
        "protocols": {
          "protocol": [
            {
              "identifier": "BGP",
              "name": "BGP",
              "config": {
                "identifier": "BGP",
                "name": "BGP"
              },
              "bgp": {
                "global": {
                  "config": {
                    "as": 65501,
                    "router-id": "192.0.2.1"
                  },
                  "afi-safis": {
                    "afi-safi": [
                      {
                        "afi-safi-name": "IPV4_UNICAST",
                        "config": {
                          "afi-safi-name": "IPV4_UNICAST",
                          "enabled": true
                        },
                        "use-multiple-paths": {
                          "ebgp": {
                            "config": {
                              "maximum-paths": 2
                            }
                          }
                        }
                      },
                      {
                        "afi-safi-name": "IPV6_UNICAST",
                        "config": {
                          "afi-safi-name": "IPV6_UNICAST",
                          "enabled": true
                        },
                        "use-multiple-paths": {
                          "ebgp": {
                            "config": {
                              "maximum-paths": 2
                            }
                          }
                        }
                      }
                    ]
                  }
                },
                "peer-groups": {
                  "peer-group": [
                    {
                      "peer-group-name": "BGP-PEER-GROUP-V4-P1",
                      "config": {
                        "peer-group-name": "BGP-PEER-GROUP-V4-P1",
                        "peer-as": 200
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV4_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV4_UNICAST",
                              "enabled": true
                            },
                            "apply-policy": {
                              "config": {
                                "import-policy": [
                                  "ALLOW"
                                ],
                                "export-policy": [
                                  "ALLOW"
                                ]
                              }
                            },
                            "use-multiple-paths": { "config": { "enabled": true } }
                          }
                        ]
                      }
                    },
                    {
                      "peer-group-name": "BGP-PEER-GROUP-V6-P1",
                      "config": {
                        "peer-group-name": "BGP-PEER-GROUP-V6-P1",
                        "peer-as": 200
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV6_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV6_UNICAST",
                              "enabled": true
                            },
                            "apply-policy": {
                              "config": {
                                "import-policy": [
                                  "ALLOW"
                                ],
                                "export-policy": [
                                  "ALLOW"
                                ]
                              }
                            },
                            "use-multiple-paths": { "config": { "enabled": true } }
                          }
                        ]
                      }
                    },
                    {
                      "peer-group-name": "BGP-PEER-GROUP-V4-P2",
                      "config": {
                        "peer-group-name": "BGP-PEER-GROUP-V4-P2",
                        "peer-as": 200
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV4_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV4_UNICAST",
                              "enabled": true
                            },
                            "apply-policy": {
                              "config": {
                                "import-policy": [
                                  "ALLOW"
                                ],
                                "export-policy": [
                                  "ALLOW"
                                ]
                              }
                            },
                            "use-multiple-paths": { "config": { "enabled": true } }
                          }
                        ]
                      }
                    },
                    {
                      "peer-group-name": "BGP-PEER-GROUP-V6-P2",
                      "config": {
                        "peer-group-name": "BGP-PEER-GROUP-V6-P2",
                        "peer-as": 200
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV6_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV6_UNICAST",
                              "enabled": true
                            },
                            "apply-policy": {
                              "config": {
                                "import-policy": [
                                  "ALLOW"
                                ],
                                "export-policy": [
                                  "ALLOW"
                                ]
                              }
                            },
                            "use-multiple-paths": { "config": { "enabled": true } }
                          }
                        ]
                      }
                    }
                  ]
                },
                "neighbors": {
                  "neighbor": [
                    {
                      "neighbor-address": "192.0.2.2",
                      "config": {
                        "neighbor-address": "192.0.2.2",
                        "peer-as": 200,
                        "enabled": true,
                        "peer-group": "BGP-PEER-GROUP-V4-P1"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV4_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV4_UNICAST",
                              "enabled": true
                            }
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "2001:db8::2",
                      "config": {
                        "neighbor-address": "2001:db8::2",
                        "peer-as": 200,
                        "enabled": true,
                        "peer-group": "BGP-PEER-GROUP-V6-P1"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV6_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV6_UNICAST",
                              "enabled": true
                            }
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "192.0.2.6",
                      "config": {
                        "neighbor-address": "192.0.2.6",
                        "peer-as": 200,
                        "enabled": true,
                        "peer-group": "BGP-PEER-GROUP-V4-P2"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV4_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV4_UNICAST",
                              "enabled": true
                            }
                          }
                        ]
                      }
                    },
                    {
                      "neighbor-address": "2001:db8::6",
                      "config": {
                        "neighbor-address": "2001:db8::6",
                        "peer-as": 200,
                        "enabled": true,
                        "peer-group": "BGP-PEER-GROUP-V6-P2"
                      },
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "IPV6_UNICAST",
                            "config": {
                              "afi-safi-name": "IPV6_UNICAST",
                              "enabled": true
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              }
            },
            {
              "identifier": "ISIS",
              "name": "ISIS",
              "config": {
                "identifier": "ISIS",
                "name": "ISIS"
              },
              "isis": {
                "global": {
                  "config": {
                    "hello-padding": "DISABLE"
                  }
                },
                "interfaces": {
                  "interface": [
                    {
                      "interface-id": "port1",
                      "config": {
                        "interface-id": "port1",
                        "enabled": true
                      },
                      "levels": {
                        "level": [
                          {
                            "level-number": 2,
                            "config": {
                              "level-number": 2
                            }
                          }
                        ]
                      }
                    },
                    {
                      "interface-id": "port2",
                      "config": {
                        "interface-id": "port2",
                        "enabled": true
                      },
                      "levels": {
                        "level": [
                          {
                            "level-number": 2,
                            "config": {
                              "level-number": 2
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              }
            }
          ]
        }
      }
    ]
  },
  "routing-policy": {
    "policy-definitions": {
      "policy-definition": [
        {
          "name": "ALLOW",
          "config": {
            "name": "ALLOW"
          },
          "statements": {
            "statement": [
              {
                "name": "20",
                "config": {
                  "name": "20"
                },
                "actions": {
                  "config": {
                    "policy-result": "ACCEPT_ROUTE"
                  }
                }
              }
            ]
          }
        }
      ]
    }
  }
}

OpenConfig Path and RPC Coverage

The below YAML defines the OC paths intended to be covered by this test. OC paths used for test setup are not listed here.

paths:

  ## State Paths ##
  /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/next-hop-group:
  /network-instances/network-instance/afts/ipv4-unicast/ipv4-entry/state/prefix:
  /network-instances/network-instance/afts/ipv6-unicast/ipv6-entry/state/next-hop-group:
  /network-instances/network-instance/afts/ipv6-unicast/ipv6-entry/state/prefix:
  /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops/next-hop/state/index:
  /network-instances/network-instance/afts/next-hop-groups/next-hop-group/next-hops/next-hop/state/weight:
  /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/state/index:
  /network-instances/network-instance/afts/next-hops/next-hop/state/ip-address:

rpcs:
  gnmi:
    gNMI.Subscribe: