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Should a customer with PA space", "wishes not to have its prefixes aggregated, a special community", "should be used to tag this route (see below).", "Prefixes from GRNET allocation that announced from public ASs", "are announced deaggregated.\\", "Prefix lengths longer than /24 for IPv4 and /48 for IPv6 are NOT", "announced to Upstream or GRIX", "Primary/Backup control", "========================", "GRNET respects the MED received by its customers; thus, the", "customers can indicate their primary/backup line and control", "incoming traffic by setting MED appropriatelly. Also, the", "customers may use the community 5408:110 to indicate their", "backup connection (lower local pref), but this method is", "recommended only for customers multihomed to another Greek ISP", "that use their connection with GRNET as backup.", "Hot Potato routing", "By setting the same attributes (Local Preference and MED) on", "advertising prefixes, a customer with more than one connections", "with GRNET has the ability to use all active paths.", "By this way, \"hot potato\" routing is achieved. Traffic will exit", "GRNETs network choosing the closest to destination border router.", "Anycast", "GRNET does not follow any explicit policy for anycast services.", "Normal routing (and, thus, preference) applies to all anycast", "routes", "BGP Communities used in GRNET:", "================================", "Informational Communities:", "+---------------------------------------------------------------+", "| These communities tag the source of the routes. They can ONLY |", "| be appended by GRNET. Routes with this tag received by any |", "| peer will be rejected! |", "5408:1001 Routes received from GEANT", "5408:1002 Routes received from GRIX", "5408:1003 Routes from GRNET (Customers & BackBone)", "5408:1004 Routes from GEANT NREN", "5408:1005 Routes from GEANT IAS", "5408:1006 Routes from GEANT CLS", "Special Communities for route manipulation:", "5408:2000 Do not aggregate", "5408:2005 Prepend AS5408 x5", "5408:4001 Do not announce to GRIX", "5408:4005 Do not announce to GEANT", "5408:4006 Do not announce to GEANT NREN VRF", "5408:4007 Do not announce to GEANT Tier-1", "Routing Manipulation (for GRNET customers only):", "| This set of tools allow GRNET clients to manipulate their |", "| routing: |", "LOCAL PREFERENCES IN GRNET:", "=============================", "LocalPref 200: - GRNET Customers", "- Special Customers (KROOT, SYZEYXIS, ...)", "- Locally Generated GRNET Aggregates", "LocalPref 190: - GRNET Customers, backup connection", "LocalPref 180: - GEANT NREN VRF", "LocalPref 170: - GRIX routes (MED=0 Primary, MED=20 Secondary)", "LocalPref 160: - GEANT CLS VRF", "LocalPref 150: - GRNET as backup in dual homed customers", "LocalPref 140: - GEANT IAS VRF", "=======================================================================", "iBGP (AS5408)", "----------------------------------------------------------------------", "PEER DESCRIPTION:", "Full-mesh iBGP peerings.", "Import Policy: Accept ANY", "Export Policy: Advertize (a) all routes (FIRT) or (b) GRNET & GRIX", "routes only, depending on router capabilities.", "======================================================================", "GEANT (AS20965)", "GEANT is the Internet Upstream for GRNET", "Import Policy: Accept all routes (apart from martians),", "set MED appropratelly on primary & backup peering.", "Export Policy: Announce all GRNET routes (tagged with 5408:1003)", "that are not tagged with 5408:4005 (don't-announce-to-geant).", "Aggregate PA space (except from the routes tagged with", "5408:2000 (do not aggregate) community.", "GRIX Peers", "These are the GRIX Peers of GRNET", "Import Policy: Reject routes tagged with special communities", "Accept all other routes that", "(a) have the appropriate AS path and", "(b) originate from the peer (or behind it)", "For these, and according to the received communities:", "(i) Set the appropriate local preference", "that are not tagged with 5408:4001 (don't-announce-to-grix).", "GRIX RS", "GRIX ROUTER @ GRIX", "K-ROOT mirror @ GRIX", "K-ROOT @ GRIX. Accept K-Root routes, announce within GRNET *only*", "Announce default route.", "GRNET Clients", "These are the normal GRNET clients (Universities, Research orgs, etc)", "(b) originate from the client (or behind it)", "Prefixes with no corresponding exact matching route on the", "RIPE whois database are only accepted if tagged with NO_EXPORT", "Local Preference (on backup links) can be lowered by", "using the appropriate community (5408:110), but MED is", "recommended for this purpose.", "Export Policy:", "(a) either all routes (FIRT)", "(b) or a partial routing table, consiting", "GRNET (5408:1003) and GRIX (5408:1002) routes", "(c) or a partial routing table, consiting", "GRNET (5408:1003) and GRIX (5408:1002) routes plus default route 0/0.", "(d) or default route 0/0.", "EU ACADEMIC INTERNET (GRNET + OTHER EU NRENS)", "PEER DESCRIPTION: announce GRNET and GEANT NREN (community 20965:155), route within GRNET *only*.", "GRNET SERVICES", "do not announce anything, accept AS65500", "GRNET ECI-ECN", "do not announce anything, accept AS65502", "SYZEYXIS", "announce only GRNET routes, route within GRNET *only*.", "AKAMAI", "AKAMAI. Accept no routes. 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