Rayhaan JaufeerallyandClaude Fable 5.1
ad07233196
Phase 1 of the BGP teaching demo: the daemon can now originate routes and
advertise them to every established peer.
- rib: add LocalRib actor holding locally originated routes with owner,
origin, AS-path prepend, MED, standard and large communities. Enforces a
LocalRibPolicy (prefix allowlist, per-owner limit, owner match on
replace/withdraw) and emits LocalRibEvents.
- server: add SessionRegistry with per-session outbound queues; sessions
register on Established and deregister via a drop guard. Emits
SessionEvent::{Up,Down}.
- server: advertiser task fans LocalRib changes out to all sessions and
replays the table to new sessions. UPDATE builders handle IPv4 (legacy
NLRI) and IPv6 (MP_REACH/MP_UNREACH).
- fsm: merge the timer and timer-less established loops into one select!
with an outbound branch; reset the hold timer on any received message
per RFC 4271 §8.2.2 (previously only on KEEPALIVE).
- config: new local_route_policy proto message.
- packet: fix Communitites typo, expose CommunitiesPathAttribute inner vec.
- primitives: IpPrefix::contains.
- integration tests: announce/withdraw/replay/fan-out/policy coverage.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
5.2 KiB
5.2 KiB
RFCs
Tracks which RFCs are implemented, partially implemented, or only represented in the wire format layer.
Legend
- ✅ Implemented — functional end-to-end
- 🟡 Wire format only — parsed and serialised correctly, but not yet acted on
- ❌ Not implemented
Core BGP
RFC 4271 — A Border Gateway Protocol 4 (BGP-4)
https://datatracker.ietf.org/doc/html/rfc4271
The base protocol specification.
| Section | Description | Status |
|---|---|---|
| §4.1 | Message framing (marker, length, type) | ✅ |
| §4.2 | OPEN message | ✅ |
| §4.3 | UPDATE message (path attributes, NLRI, withdrawn routes) | ✅ |
| §4.4 | KEEPALIVE message | ✅ |
| §4.5 | NOTIFICATION message (all error codes and subcodes) | ✅ |
| §8 | FSM — passive (inbound) side: OpenSent → OpenConfirm → Established | ✅ |
| §8 | FSM — active (outbound) side: Idle → Connect → Active | ❌ |
| §9 | Decision process / best-path selection | ❌ |
| §9 | Adj-RIB-In (per-peer table of received routes) | ✅ |
| §9 | Locally originated routes, advertised to all established peers | ✅ |
| §9 | Loc-RIB / Adj-RIB-Out for routes learned from peers (re-advertisement) | ❌ |
| §9.2 | Hold timer reset on any received message (not only KEEPALIVE) | ✅ |
Capability and Session Extensions
RFC 6793 — BGP Support for Four-Octet Autonomous System (AS) Number Space
https://datatracker.ietf.org/doc/html/rfc6793
| Feature | Status |
|---|---|
AS_TRANS (23456) sentinel |
✅ |
FourByteAsn capability advertisement and parsing |
✅ |
4-byte AS_PATH segment encoding/decoding via ParserContext |
✅ |
| 4-byte ASN negotiation in FSM | ✅ |
RFC 9072 — Extended Optional Parameters Length for BGP OPEN Message
https://datatracker.ietf.org/doc/html/rfc9072
| Feature | Status |
|---|---|
| Parsing extended-length OPEN (0xFF sentinel) | ✅ |
| Serialising extended-length OPEN when options exceed 255 bytes | ✅ |
RFC 2918 — Route Refresh Capability for BGP-4
https://datatracker.ietf.org/doc/html/rfc2918
| Feature | Status |
|---|---|
RouteRefresh capability advertisement |
✅ |
ROUTE-REFRESH message type (5) framing |
✅ |
| AFI/SAFI payload parsing | ❌ |
| Acting on received ROUTE-REFRESH (re-advertising routes) | ❌ |
RFC 7313 — Enhanced Route Refresh Capability for BGP-4
https://datatracker.ietf.org/doc/html/rfc7313
| Feature | Status |
|---|---|
EnhancedRouteRefresh capability wire format |
🟡 |
RFC 4724 — Graceful Restart Mechanism for BGP
https://datatracker.ietf.org/doc/html/rfc4724
| Feature | Status |
|---|---|
GracefulRestart capability wire format |
🟡 |
| Restart state and forwarding preserved across sessions | ❌ |
RFC 9494 — Long-Lived Graceful Restart for BGP
https://datatracker.ietf.org/doc/html/rfc9494
| Feature | Status |
|---|---|
LongLivedGracefulRestart capability wire format |
🟡 |
RFC 8654 — Extended Message Support for BGP
https://datatracker.ietf.org/doc/html/rfc8654
| Feature | Status |
|---|---|
ExtendedMessage capability wire format |
🟡 |
Raising BGP_MAX_MSG_LEN to 65535 when negotiated |
❌ |
Multiprotocol and NLRI
RFC 2858 — Multiprotocol Extensions for BGP-4
https://datatracker.ietf.org/doc/html/rfc2858
| Feature | Status |
|---|---|
MultiProtocol capability advertisement (IPv4 unicast) |
✅ |
MP_REACH_NLRI path attribute (parse, serialise) |
✅ |
MP_UNREACH_NLRI path attribute (parse, serialise) |
✅ |
| IPv4 and IPv6 next-hop encoding | ✅ |
RFC 8950 — Advertising IPv4 Network Layer Reachability Information (NLRI) with an IPv6 Next Hop
https://datatracker.ietf.org/doc/html/rfc8950
| Feature | Status |
|---|---|
ExtendedNextHop capability wire format |
🟡 |
Path Attributes and Communities
RFC 1997 — BGP Communities Attribute
https://datatracker.ietf.org/doc/html/rfc1997
| Feature | Status |
|---|---|
COMMUNITIES path attribute (parse, serialise) |
✅ |
| Attach to locally originated routes | ✅ |
RFC 4360 — BGP Extended Communities Attribute
https://datatracker.ietf.org/doc/html/rfc4360
| Feature | Status |
|---|---|
EXTENDED_COMMUNITIES path attribute (parse, serialise) |
✅ |
| AS-specific, IPv4-address-specific, opaque, route-target, route-origin subtypes | ✅ |
RFC 8092 — BGP Large Communities Attribute
https://datatracker.ietf.org/doc/html/rfc8092
| Feature | Status |
|---|---|
LARGE_COMMUNITIES path attribute (parse, serialise) |
✅ |
| Attach to locally originated routes | ✅ |
Other Capabilities (Wire Format Only)
The following capabilities are parsed and serialised correctly but have no functional behaviour implemented beyond that.
| RFC | Capability | Status |
|---|---|---|
| RFC 5291 | Outbound Route Filtering (ORF) | 🟡 |
| RFC 7911 | ADD-PATH | 🟡 |
| RFC 8205 | BGPsec | 🟡 |
Error Handling
RFC 9687 — BGP Send Hold Timer
https://datatracker.ietf.org/doc/html/rfc9687
| Feature | Status |
|---|---|
SendHoldTimer error code (8) defined |
✅ |
| Send hold timer enforcement | ❌ |