Look here for complete TelisSonera BGP Community: 

http://www.db.ripe.net/whois?searchtext=-a+-r+-T+aut-num+as1299

Communities of Tiscali International Network (TINet) - AS3257

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This is the list of BGP communities that can be set by customers

(after engineering@ip.tiscali.net approval):

• 3257:1030 do not announce to upstream.
• 3257:1031 prepend 1x to upstream.
• 3257:1032 prepend 2x to upstream.
• 3257:1033 prepend 3x to upstream.

Customer Setup Information

Multi-homing with BGP (Border Gateway Protocol) is the practice of connecting to multiple service providers and having simultaneous external BGP peering sessions with each provider. A Multi-homed customer typically owns an Autonomous System Number and exchanges routing table information with two or more upstream Internet
Service Providers (ISPs).

In iBGP, there is a rule to avoid routing loop by not advertise any route receive from other iBGP neighbor.  The rule have consequence that every router in the AS needs peer with all router so every router have routing from other router in the AS.  This is called full mesh configuration.