BGP Integration¶

BGP members contribute to the FadianNet shared backbone by announcing routes and providing transit.

Overview¶

FadianNet BGP creates a mesh of interconnected members that:

Announce their own IP prefixes to the federation
Receive routes from other members
Provide transit for VPN-only members
Build a resilient, distributed internet backbone

Architecture¶

graph LR
    subgraph "FadianNet BGP Mesh"
        A[Member A<br/>AS 204921] --- B[Member B<br/>AS 65001]
        B --- C[Member C<br/>AS 65002]
        A --- C
    end

    A --- V1[VPN-Only<br/>Member D]
    C --- V2[VPN-Only<br/>Member E]

    A -.- IX1[Internet<br/>Exchange]
    B -.- IX2[Upstream<br/>ISP]

BGP Configuration¶

BIRD 2.x¶

Recommended BGP daemon for FadianRoam members.

Router ID and Loopback¶

router id 172.172.11.X;  # Your assigned loopback from 172.172.11.0/24

FadianNet BGP Template¶

template bgp fadiannet {
    local as XXXXX;           # Your ASN
    hold time 90;
    keepalive time 30;
    graceful restart on;

    ipv4 {
        import filter fadiannet_import;
        export filter fadiannet_export;
        next hop self;
    };
}

Import Filter¶

filter fadiannet_import {
    # Accept FadianNet internal routes
    if net ~ [172.172.10.0/24, 172.172.11.0/24, 172.172.12.0/16] then accept;

    # Accept member-announced prefixes (validated by federation registry)
    if (65000, 0) ~ bgp_community then accept;

    reject;
}

Export Filter¶

filter fadiannet_export {
    # Announce your own prefixes
    if source = RTS_STATIC then {
        bgp_community.add((65000, 0));  # FadianNet origin community
        accept;
    }

    # Announce MGMT route for reachability
    if net = 172.172.10.0/24 then accept;

    reject;
}

Peer Configuration¶

protocol bgp fadiannet_peer_b from fadiannet {
    neighbor 172.172.12.2 as YYYYY;  # Peer's ASN
    description "FadianNet - Member B";

    interface "fadiannet-peer-b";
}

FRRouting¶

Alternative BGP daemon configuration:

router bgp XXXXX
 bgp router-id 172.172.11.X
 no bgp default ipv4-unicast

 neighbor fadiannet peer-group
 neighbor fadiannet remote-as external

 neighbor 172.172.12.2 peer-group fadiannet

 address-family ipv4 unicast
  neighbor fadiannet activate
  neighbor fadiannet soft-reconfiguration inbound
  network 203.0.113.0/24
 exit-address-family

Route Types¶

Internal Routes¶

Automatically exchanged between all BGP members:

Prefix	Purpose
`172.172.10.0/24`	MGMT network reachability
`172.172.11.0/24`	Loopback reachability
`172.172.12.0/16`	P2P link reachability

Member Prefixes¶

Each BGP member announces their own public IP prefixes:

Prefixes must be registered in the member's federation YAML file
Tagged with FadianNet community (65000, 0) on export
Validated against the federation registry on import

Transit¶

Members with upstream connectivity can optionally provide transit:

Announce a default route (0.0.0.0/0) to FadianNet peers
VPN-only members receive this as their internet gateway
Transit providers should set appropriate communities

BGP Communities¶

Community	Meaning
`(65000, 0)`	Originated within FadianNet
`(65000, 1)`	Transit route
`(65000, 100)`	Do not export to external peers
`(65000, 200)`	Blackhole

Monitoring¶

BIRD¶

birdc show protocols all fadiannet_*
birdc show route protocol fadiannet_peer_b
birdc show route where net = 172.172.11.0/24

FRRouting¶

vtysh -c "show bgp summary"
vtysh -c "show bgp ipv4 unicast"
vtysh -c "show bgp neighbors 172.172.12.2"

Requirements¶

Requirement	Details
ASN	Public or private (64512–65534 for private)
BGP daemon	BIRD 2.x or FRRouting
IP prefix	At least one routable prefix
WireGuard tunnels	One per BGP peer
Public IP	Required for endpoint reachability