Customers may set any of the following communities in order to alter
the default treatment of prefixes advertised to AboveNet.

	6461:5000 suppress announcement to all peers
	6461:5001 prepend once to all peers
	6461:5002 prepend twice to all peers
	6461:5003 prepend three times to all peers
	6461:5060 set localpref inside AS6461 to 60 (transit-backup)
	6461:5180 set localpref inside AS6461 to 180 (transit-depref)
	6461:5220 set localpref inside AS6461 to 220 (transit-preferred)
	6461:5990 Blackhole community - All Sessions are enabled by Default.
	65535:65281 (a.k.a. NO_EXPORT) do not announce to anyone

Whenever communities are sent to customers they are translated into
one of three possible categories:

	6461:5997 prefix was learned from a peer
	6461:5998 prefix was learned from a customer
	6461:5999 internal prefix