BGP communities used by AS40271. Informational communities are tagged on ingestion and never accepted from outside. Action communities are accepted from downstreams to control how routes propagate.
Set by AS40271 on every route as it enters our network. Useful for diagnostics; ignore them on your side or filter on them as you like.
Internal route marker
| Community | Name | Meaning |
|---|
40271:1500:1 | Internal | Originated within AS40271 (cache prefixes, infrastructure). |
Peer Type ID — 40271:1900:*
| Community | Name | Meaning |
|---|
40271:1900:1 | Transit | Learned from a paid transit upstream. |
40271:1900:2 | Peer | Learned from a settlement-free peer. |
40271:1900:3 | Customer | Learned from a downstream customer / participant. |
40271:1900:4 | Internal | Learned via iBGP (originated by AS40271). |
Peer ASN — 40271:1901:*
| Community | Name | Meaning |
|---|
40271:1901:<asn> | Origin neighbor ASN | The 16-bit neighbor ASN. Use the large-community equivalent for 4-byte ASNs. |
RPKI state — 40271:1902:*
| Community | Name | Meaning |
|---|
40271:1902:1 | Valid | A covering ROA matched the route. |
40271:1902:2 | Invalid | Covering ROA did not match. Route is dropped; community shown for completeness. |
40271:1902:3 | NotFound / Unknown | No covering ROA exists. |
Location ID — 40271:1984:*
| Community | Name | Meaning |
|---|
40271:1984:0 | SFO01 | 365 Main St., San Francisco (Digital Realty) |
40271:1984:1 | SFO02 | 200 Paul Ave., San Francisco (Digital Realty) |
40271:1984:2 | FMT01 | 48233 Warm Springs Blvd., Fremont (Hurricane Electric) |
40271:1984:3 | SJC01 | 11 Great Oaks Blvd., San Jose (Equinix SV1) |
40271:1984:4 | SCL01 | 2807 Mission College Blvd., Santa Clara (QTS) |
40271:1984:5 | SCL02 | 2972 Stender Way, Santa Clara (CoreSite) |
40271:1984:6 | SCL04 | 3223 Kenneth St., Santa Clara (OpenColo) |
40271:1984:7 | SJC02 | 55 S Market St., San Jose (CoreSite) |
40271:1984:8 | SCL05 | 2805 Lafayette St., Santa Clara (Digital Realty) |
Action
Set these communities on routes you announce to AS40271 and we’ll act on them. These are the only communities we honor on ingress.
Don’t propagate to a specific ASN — 40271:2000:<asn>
| Community | Name | Meaning |
|---|
40271:2000:<asn> | No-export to ASN | Replace <asn> with the 16-bit neighbor ASN you want to keep this prefix away from. |
Don’t propagate to a peer type — 40271:2001:*
| Community | Name | Meaning |
|---|
40271:2001:1 | No-export to transit | Will not be advertised to paid transit upstreams. |
40271:2001:2 | No-export to peers | Will not be advertised to settlement-free peers. |
40271:2001:3 | No-export to customers | Will not be advertised to downstream participants. |
Edge blackhole — 40271:2666:666
| Community | Name | Meaning |
|---|
40271:2666:666 | Blackhole | Discard ingress traffic toward this prefix at AS40271’s edge. /32 (v4) or /128 (v6) only. |
Quick reference
# Suppress this prefix from being announced to AS15169
ip community-list expanded NO-GOOG permit ^40271:2000:15169$
# Blackhole an attacked /32
route-map BLACKHOLE-OUT permit 10
match ip address prefix-list MY-V4-HOSTS
set community 40271:2666:666 additive
