Aut NumberAS20965
AS NameGEANT
StatusASSIGNED
Description
The GEANT IP Service
The GEANT Network Connects the European National Regional Education Networks (NRENs) together
OrganizationORG-DLCU1-RIPE
Admin Contacts
EJA2-RIPE
Tech Contacts
DANT-RIPE
Remarks
GEANT Research and Education Network
=== BEGIN === INFORMATION ==========================================================
NREN routes are marked with an informational community based on ASN.
20965:<ASN> For 2-byte ASNs
origin:<ASN>:20965 For 4-byte ASNs
NRENs can block advertisements to other NRENs using a specific block community.
64512:<ASN> For 2-byte destination ASNs
origin:<ASN>:64512 For 4-byte destination ASNs
NRENs are welcome to use specific communities to define how routes are advertised to R&E peers
R&E Peers participate in the exchange of R&E traffic but are not part of the GEANT consortium
Prepending is additive, combine communities to increase prepending.
20965:0000 - Don't announce the routes to all R&E Peers
20965:0010 - Prepend GEANT AS one time towards all R&E Peers
20965:0020 - Prepend GEANT AS two times towards all R&E Peers
20965:0030 - Prepend GEANT AS three times towards all R&E Peers
20965:0060 - Prepend GEANT AS six times towards all R&E Peers
Routes can be manipulated using per-peer communities
Penultimate digit is used to govern route action
20965:...0. - Block advertisement to R&E Peer
20965:...1. - Prepend GEANT AS one time towards to R&E Peer
20965:...2. - Prepend GEANT AS two times towards to R&E Peer
20965:...3. - Prepend GEANT AS three times towards to R&E Peer
20965:...6. - Prepend GEANT AS six times towards to R&E Peer
20965:20.0 - SINET
20965:30.0 - CANARIE
20965:45.0 - UbuntuNet
20965:50.0 - Internet2
20965:60.0 - ESnet
20965:80.0 - RedCLARA
20965:85.0 - NISN
20965:90.0 - TEIN
20965:120.0 - SARInet/KAUST
20965:150.0 - ASREN
20965:160.0 - KREONET
20965:170.0 - NKN
20965:180.0 - IRANET
20965:190.0 - OMREN
20965:200.0 - KIAE
20965:210.0 - SingAREN
20965:220.0 - WACREN
20965:230.0 - HBKU
20965:240.0 - Maaen
20965:250.0 - ANKABUT
20965:260.0 - TENET
20965:270.0 - NIKS
20965:280.0 - UTIC
20965:290.0 - T-SYSTEMS
20965:300.0 - CSTNET
20965:310.0 - CAREN
20965:320.0 - AARNet
20965:330.0 - ESTINET
20965:340.0 - MARWAN
20965:350.0 - HARNET
20965:360.0 - ARN
20965:370.0 - ASNET-TW
20965:380.0 - SUM
20965:0008 - RTBH service, /32 and /128 prefixes only
20965:0001 - Routes heard with suspected commercial ASNs in the path.
20965:0002 - Anycast Routing
Anycast routes are identified by a prefix list and community filter and the local preference raised on backup links.
NRENs who add this community will see no effect unless they also instruct us to add the route to our prefix-list.
20965:0007 - Global Anycast Routing (Incl. DNS root servers)
Global anycast routes are marked with the above community and accepted from NRENs.
===============
R&E Peer Traffic Engineering
===============
Peers are marked with the informational community 20965:65530
Peers eligible for backup transit arrangements can announce prefixes to other R&E peers like so:
64700:<ASN> For 2-byte ASNs
origin:<ASN>:64700 For 4-byte ASNs
20965:0007 - Global Anycast Routing (Incl. DNS root servers)
Global anycast routes are rejected from R&E peers.
=== END === INFORMATION ==========================================================
===============
GEANT R&E
===============
Internal internal prefixes are given community 20965:155
GEANT NRENs - National Regional Educational Networks
NREN prefixes are given a LOCAL-PREF of 150 and community 20965:155
AS7500 (DNS root name-server) is behind RENATER
GEANT PEERS - non-NRENs who receive NREN routes:
All Peers are accepted with a LOCAL-PREF of 100
The following ASs are our non-NREN peers who receive NREN routes. All peers get all routes from AS-GEANTNRN and a subset of AS-GEANTNRENPEERS based on the agreed transit policy as highlighted by the communities below.
Maintained By
RIPE-NCC-END-MNT
DANTE-MNT
Date Created2002-09-25
Date Updated2026-06-16
SourceRIPE
