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Github Action edited this page Jul 15, 2026 · 1 revision

RT-1.106: BGP RT Membership Constraints (RFC 4684)

Summary

Validate RFC 4684 Route Target (RT) Membership Constrained Route Distribution behavior in iBGP to prevent flooding VPN routes. Ensure the DUT only advertises VPN routes to peers that have requested the corresponding Route Targets.

Testbed type

  • TESTBED_DUT_ATE_2LINKS

Topology

graph LR;
  ate1["ATE Port 1 (2001:db8:0:1::2/64)"] -- "iBGP (Peer 1)" --> dut1["DUT Port 1 (2001:db8:0:1::1/64)"]
  ate2["ATE Port 2 (2001:db8:0:2::2/64)"] -- "iBGP (Peer 2)" --> dut2["DUT Port 2 (2001:db8:0:2::1/64)"]
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  • Connect ATE Port 1 to DUT Port 1.
  • Connect ATE Port 2 to DUT Port 2.
  • ATE will simulate iBGP peers negotiating different capabilities.
  • All iBGP sessions are transported over IPv6 using explicit point-to-point links.

Procedure

Configuration

  1. Configure DUT with iBGP peer group (e.g., IBGP_PEERS) with auth-password.
  2. Enable RT_MEMBERSHIP, L3VPN_IPV4_UNICAST, and L3VPN_IPV6_UNICAST address families for the peer group.
  3. Configure two VRFs on DUT:
    • VRF_100: Export/Import RT 64496:100, inject prefixes 198.51.100.10/32 and 2001:db8:2::10/128.
    • VRF_200: Export/Import RT 64496:200, inject prefixes 198.51.100.20/32 and 2001:db8:2::20/128.
  4. Setup ATE to simulate multiple iBGP peers (Simulated Peers generating VPN paths), some negotiating RT Membership and some not.

Tests

RT-1.106.1 - Default RT Membership Behavior (Outbound)

  • Step 1: Do NOT negotiate RT Membership capability from ATE Peer 1. Ensure BGP session is ESTABLISHED using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/state/session-state.
  • Step 2: Verify that DUT assumes Peer 1 is interested in ALL VPN routes (DUT generates a default RT membership route locally on behalf of Peer 1).
  • Step 3: Verify Peer 1 receives all exported VPN routes (198.51.100.10/32, 2001:db8:2::10/128 AND 198.51.100.20/32, 2001:db8:2::20/128). Verify using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/sent that all expected prefixes are sent to Peer 1.

RT-1.106.2 - Constrained Route Distribution (Outbound Filtering)

  • Step 1: Enable RT Membership negotiation on ATE Peer 2. Ensure BGP session is ESTABLISHED using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/state/session-state. Verify on DUT that the RT Membership capability is active for Peer 2 using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/active.
  • Step 2: ATE Peer 2 advertises Interest in specific Route Target 64496:100 ONLY.
  • Step 3: Verify DUT ONLY advertises VPN routes matching this Route Target to Peer 2 (Verify 198.51.100.10/32 and 2001:db8:2::10/128 are received). Verify using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/sent that the expected number of prefixes are sent.
  • Step 4: Verify DUT does NOT advertise routes with other Route Targets to Peer 2 (Verify 198.51.100.20/32 and 2001:db8:2::20/128 are NOT received). Verify using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/sent that the unexpected prefixes are NOT sent.

RT-1.106.3 - DUT RTC Origination (Inbound Constraints)

  • Step 1: Ensure DUT has VRF_100 (Imports 64496:100) and VRF_200 (Imports 64496:200) configured and active.
  • Step 2: Verify on ATE that it receives RT_MEMBERSHIP advertisements from DUT for 64496:100 and 64496:200.
  • Step 3: Verify on ATE that it does NOT receive RT_MEMBERSHIP advertisements from DUT for other unconfigured Route Targets (e.g., 64496:300).
  • Step 4: Verify using /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/received that DUT only receives prefixes matching the advertised RTCs (assuming ATE respects the RTC advertisements).

Canonical OC

Note

RT_MEMBERSHIP is not yet a standard OpenConfig AFI-SAFI type enum value. It is enabled in the test procedure but omitted from this Canonical OC sample to prevent validation failures against standard schemas. See TODO below.

{
  "network-instances": {
    "network-instance": [
      {
        "config": {
          "name": "DEFAULT"
        },
        "name": "DEFAULT",
        "interfaces": {
          "interface": [
            {
              "config": {
                "id": "Port1"
              },
              "id": "Port1"
            },
            {
              "config": {
                "id": "Port2"
              },
              "id": "Port2"
            }
          ]
        },
        "protocols": {
          "protocol": [
            {
              "bgp": {
                "global": {
                  "config": {
                    "as": 64496,
                    "router-id": "192.0.2.1"
                  }
                },
                "peer-groups": {
                  "peer-group": [
                    {
                      "config": {
                        "peer-group-name": "IBGP_PEERS",
                        "peer-as": 64496,
                        "auth-password": "ibgp_internal_secret"
                      },
                      "peer-group-name": "IBGP_PEERS",
                      "afi-safis": {
                        "afi-safi": [
                          {
                            "afi-safi-name": "openconfig-bgp-types:L3VPN_IPV4_UNICAST",
                            "config": {
                              "afi-safi-name": "openconfig-bgp-types:L3VPN_IPV4_UNICAST",
                              "enabled": true
                            }
                          },
                          {
                            "afi-safi-name": "openconfig-bgp-types:L3VPN_IPV6_UNICAST",
                            "config": {
                              "afi-safi-name": "openconfig-bgp-types:L3VPN_IPV6_UNICAST",
                              "enabled": true
                            }
                          }
                        ]
                      }
                    }
                  ]
                },
                "neighbors": {
                  "neighbor": [
                    {
                      "config": {
                        "neighbor-address": "2001:db8:0:1::2",
                        "peer-group": "IBGP_PEERS"
                      },
                      "neighbor-address": "2001:db8:0:1::2"
                    },
                    {
                      "config": {
                        "neighbor-address": "2001:db8:0:2::2",
                        "peer-group": "IBGP_PEERS"
                      },
                      "neighbor-address": "2001:db8:0:2::2"
                    }
                  ]
                }
              },
              "config": {
                "identifier": "BGP",
                "name": "BGP"
              },
              "identifier": "BGP",
              "name": "BGP"
            }
          ]
        }
      },
      {
        "config": {
          "name": "VRF_100",
          "type": "openconfig-network-instance-types:L3VRF",
          "route-distinguisher": "64496:100"
        },
        "name": "VRF_100",
        "inter-instance-policies": {
          "import-export-policy": {
            "config": {
              "import-route-target": [
                "64496:100"
              ],
              "export-route-target": [
                "64496:100"
              ]
            }
          }
        },
        "interfaces": {
          "interface": [
            {
              "config": {
                "id": "Loopback100"
              },
              "id": "Loopback100"
            }
          ]
        },
        "protocols": {
          "protocol": [
            {
              "bgp": {
                "global": {
                  "config": {
                    "as": 64496,
                    "router-id": "192.0.2.100"
                  }
                }
              },
              "config": {
                "identifier": "BGP",
                "name": "BGP"
              },
              "identifier": "BGP",
              "name": "BGP"
            }
          ]
        }
      },
      {
        "config": {
          "name": "VRF_200",
          "type": "openconfig-network-instance-types:L3VRF",
          "route-distinguisher": "64496:200"
        },
        "name": "VRF_200",
        "inter-instance-policies": {
          "import-export-policy": {
            "config": {
              "import-route-target": [
                "64496:200"
              ],
              "export-route-target": [
                "64496:200"
              ]
            }
          }
        },
        "interfaces": {
          "interface": [
            {
              "config": {
                "id": "Loopback200"
              },
              "id": "Loopback200"
            }
          ]
        },
        "protocols": {
          "protocol": [
            {
              "bgp": {
                "global": {
                  "config": {
                    "as": 64496,
                    "router-id": "192.0.2.200"
                  }
                }
              },
              "config": {
                "identifier": "BGP",
                "name": "BGP"
              },
              "identifier": "BGP",
              "name": "BGP"
            }
          ]
        }
      }
    ]
  },
  "interfaces": {
    "interface": [
      {
        "config": {
          "name": "Port1",
          "type": "iana-if-type:ethernetCsmacd"
        },
        "name": "Port1",
        "subinterfaces": {
          "subinterface": [
            {
              "config": {
                "index": 0
              },
              "index": 0,
              "ipv6": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "2001:db8:0:1::1",
                        "prefix-length": 64
                      },
                      "ip": "2001:db8:0:1::1"
                    }
                  ]
                }
              }
            }
          ]
        }
      },
      {
        "config": {
          "name": "Port2",
          "type": "iana-if-type:ethernetCsmacd"
        },
        "name": "Port2",
        "subinterfaces": {
          "subinterface": [
            {
              "config": {
                "index": 0
              },
              "index": 0,
              "ipv6": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "2001:db8:0:2::1",
                        "prefix-length": 64
                      },
                      "ip": "2001:db8:0:2::1"
                    }
                  ]
                }
              }
            }
          ]
        }
      },
      {
        "config": {
          "name": "Loopback100",
          "type": "iana-if-type:softwareLoopback"
        },
        "name": "Loopback100",
        "subinterfaces": {
          "subinterface": [
            {
              "config": {
                "index": 0
              },
              "index": 0,
              "ipv4": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "198.51.100.10",
                        "prefix-length": 32
                      },
                      "ip": "198.51.100.10"
                    }
                  ]
                }
              },
              "ipv6": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "2001:db8:2::10",
                        "prefix-length": 128
                      },
                      "ip": "2001:db8:2::10"
                    }
                  ]
                }
              }
            }
          ]
        }
      },
      {
        "config": {
          "name": "Loopback200",
          "type": "iana-if-type:softwareLoopback"
        },
        "name": "Loopback200",
        "subinterfaces": {
          "subinterface": [
            {
              "config": {
                "index": 0
              },
              "index": 0,
              "ipv4": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "198.51.100.20",
                        "prefix-length": 32
                      },
                      "ip": "198.51.100.20"
                    }
                  ]
                }
              },
              "ipv6": {
                "addresses": {
                  "address": [
                    {
                      "config": {
                        "ip": "2001:db8:2::20",
                        "prefix-length": 128
                      },
                      "ip": "2001:db8:2::20"
                    }
                  ]
                }
              }
            }
          ]
        }
      }
    ]
  }
}

OpenConfig Path and RPC Coverage

paths:
  # Network Instance / VRF Config
  /network-instances/network-instance/config/name:
  /network-instances/network-instance/state/name:
  /network-instances/network-instance/config/type:
  /network-instances/network-instance/state/type:
  /network-instances/network-instance/config/route-distinguisher:
  /network-instances/network-instance/state/route-distinguisher:
  /network-instances/network-instance/inter-instance-policies/import-export-policy/config/import-route-target:
  /network-instances/network-instance/inter-instance-policies/import-export-policy/state/import-route-target:
  /network-instances/network-instance/inter-instance-policies/import-export-policy/config/export-route-target:
  /network-instances/network-instance/inter-instance-policies/import-export-policy/state/export-route-target:
  /network-instances/network-instance/interfaces/interface/config/id:
  /network-instances/network-instance/interfaces/interface/state/id:

  # Interface Config (Loopbacks/Prefix Injection)
  /interfaces/interface/config/name:
  /interfaces/interface/config/type:
  /interfaces/interface/subinterfaces/subinterface/config/index:
  /interfaces/interface/subinterfaces/subinterface/ipv4/addresses/address/config/ip:
  /interfaces/interface/subinterfaces/subinterface/ipv4/addresses/address/config/prefix-length:
  /interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/config/ip:
  /interfaces/interface/subinterfaces/subinterface/ipv6/addresses/address/config/prefix-length:

  # BGP AFI-SAFI Enablement
  /network-instances/network-instance/protocols/protocol/bgp/global/config/as:
  /network-instances/network-instance/protocols/protocol/bgp/global/config/router-id:
  /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/config/enabled:
  /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/state/enabled:
  /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/afi-safis/afi-safi/afi-safi-name:

  # BGP Neighbor State
  /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/state/session-state:
  /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/active:
  /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/sent:
  /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/received:
  /network-instances/network-instance/protocols/protocol/bgp/neighbors/neighbor/afi-safis/afi-safi/state/prefixes/installed:

  # MD5 Auth (New in this version)
  /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/config/auth-password:
  /network-instances/network-instance/protocols/protocol/bgp/peer-groups/peer-group/config/peer-as:

rpcs:
  gnmi:
    gNMI.Set:
      union_replace: true
    gNMI.Subscribe:
      on_change: true

TODO

  • Request addition of RT_MEMBERSHIP (or RTC) to the standard OpenConfig AFI_SAFI_TYPE identities in openconfig-bgp-types.yang to support RFC 4684 validation natively.

Required DUT platform

  • FFF (Fixed Form Factor) or MFF supporting RFC 4684.

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