BGP Communities
Communities for Peers
Well-known communities
| Community |
Description |
| no-export |
Do not announce prefix to any eBGP peer of SysEleven, but distribute the prefix within AS25291. |
| no-advertise |
Do not announce prefix to any BGP peer connected to the session-holding PE. |
Path prepend
| Community |
Description |
| 64512:TARGETASN |
Do not announce prefix to TARGETASN. |
| 64513:TARGETASN |
Prepend prefix to TARGETASN once. |
| 64514:TARGETASN |
Prepend prefix to TARGETASN twice. |
Blackholing
We support Remote Triggered Blackholing (RTBH) within our IP backbone for Peers with proper AS-SETS. Accepted prefix length for blackhole routes are /32 (IPv4) and /128 (IPv6). The well-known blackholing community defined in RFC7999 "65535:666" is used for this. See also: https://github.com/tking/BLACKHOLE-BGP-Community.
| Community |
Description |
| 65535:666 |
Traffic to prefixes with a prefix length of /32 respectively /128 tagged with this community will be discarded. |
Communities for Customers
Communities only applicable for IP-Transit customers. We are pleased to add additional communities based on customer requests, please contact our engineering team or open a support ticket via
noc@syseleven.de.
Blackholing
The Blackhole (see above) routes of our Customers are additionally announced to our upstream providers.
The SysEleven community "25291:666" is deprecated, please use the well-known community "65535:666".
To ensure our transit provider DTAG (AS3320, Deutsche Telekom) accepts RTBH routes from SysEleven transit customers, the `aut-num` RIPE object of the customer has to include `member-of: AS3320:AS-AUTH-PILOT-BLACKHOLE-FROM-AS25291`. Please add this to your `aut-num` object.
Selective Blackholing
Selective Blackholing will be supported by SysEleven shortly, information will follow, stay tuned.
| Community |
Description |
| 25291:641 |
Only blackhole inside the region the announcement originated. |
| 25291:642 |
Only blackhole inside the country the announcement originated. |
| 25291:643 |
Only blackhole outside the region the announcement originated. |
| 25291:644 |
Only blackhole outside the country the announcement originated. |
Routeorigin
To simplify traffic engineering for customers, routes are tagged based on their origin.
Origin by type
| Community |
Description |
| 25291:1000 |
Prefix learned from CUSTOMER |
| 25291:1001 |
Prefix learned from PEER |
| 25291:1002 |
Prefix learned from UPSTREAM |
Origin by region
| Community |
Description |
| 25291:1100 |
Prefix learned within EUROPE |
Origin by country
| Community |
Description |
| 25291:1200 |
Prefix learned within DE (Germany) |
| 25291:1201 |
Prefix learned within NL (Netherlands) |
| 25291:1202 |
Prefix learned within CH (Switzerland) |
| 25291:1203 |
Prefix learned within SWE (Sweden) |
| 25291:1204 |
Prefix learned within AT (Austria) |
Origin by cities
| Community |
Description |
| 25291:1300 |
Prefix learned in BER (Berlin, Germany) |
| 25291:1301 |
Prefix learned in FRA (Frankfurt, Germany) |
| 25291:1302 |
Prefix learned in AMS (Amsterdam, Netherlands) |
| 25291:1303 |
Prefix learned in ZRH (Zurich, Switzerland) |
| 25291:1304 |
Prefix learned in STH (Stockholm, Sweden) |
| 25291:1304 |
Prefix learned in VIE (Vienna, Austria) |
Origin by Internet exchange point
| Community |
Description |
| 25291:1400 |
Prefix learned at BCIX |
| 25291:1401 |
Prefix learned at DE-CIX Frankfurt |
| 25291:1402 |
Prefix learned at AMS-IX |
| 25291:1403 |
Prefix learned at SwissIX |
| 25291:1404 |
Prefix learned via PNI |
| 25291:1405 |
Prefix learned from CACHE (e.g. Google Cache) |
| 25291:1407 |
Prefix learned at STHIX - Stockholm |
| 25291:1408 |
Prefix learned at VIX - Vienna |
Origin by Upstream
| Community |
Description |
| 25291:1500 |
Prefix learned from DTAG (AS3320, Deutsche Telekom) |
| 25291:1501 |
Prefix learned from Telia (AS1299, Telia Carrier) |
| 25291:1502 |
Prefix learned from Level3 (AS3356, Level3) |
| 25291:1503 |
Prefix learned from NTT (AS2914, NTT) |