Cisco router can be used as VPN server, using PPTP, for client from internet accesing private network.

As using route reflector is a way simplifying and scaling iBGP configuration, it is recommended to use if you have many routers in your AS.

IBGP require all BGP systems within the AS are a fully meshed, so that any external routing information is redistributed among all routers within the AS. 

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. 

This post will shows applications of BGP Community.  It doesn't show deep description about BGP Community.  BGP communities are tags, or attributes that can be attached to BGP prefixes announcement.  Based on that community, policy can be define to do something to that routes.  BGP Communities are descibed in RFC 1997.  According to RFC 1997, BGP Communities describe as a group of destinations which share some common property.  Each autonomus system administrator may define which communities a destination belongs to.  By default, all destinations belong to the general Internet community.  BGP Community have 32 bit value.

Cisco has support EIGRP as PE CPE routing protocol in MPLS VPN.  It is just like another routing protocol using for PE CPE roituing protocol.  The mechanism is common.  EIGRP in PE talk with EIGRP in CPE to exchange routing, then routing receive from CPE is redistribute to MP BGP (multi protocol BGP) running under address family configuration.  EIGRP receive all VPN routing from reditributing form MP BGP (multi protocol BGP) running under address family configuration.

Peer group in a set of BGP neighbor that share some policy.  Policy that can be the same, for example, route-map, filter-list, prefix-list, update-source, route-reflector client.  Peer group can reduce cpu process consumption, also configuration effort.