| Community | Description |
| 8218:9999 | customer blackhole (works up to /32) |
| 8218:1010 | customer secondary session (set localpref 10 less than normal customer session) |
| 8218:1020 | push customer below peering (set localpref 10 less than peers) |
| 8218:1030 | push customer below transit (set localpref 10 less than transit providers) |
| | |
| 8218:2010 | do not announce to AS6461 (AboveNet) |
| 8218:2011 | prepend once |
| 8218:2012 | prepend twice |
| 8218:2013 | prepend thrice |
| | |
| 8218:2020 | do not announce to transit-1 (AS3257 Tiscali) |
| 8218:2021 | prepend once to transit-1 |
| 8218:2022 | prepend twice to transit-1 |
| 8218:2023 | prepend thrice to transit-1 |
| 8218:2030 | do not announce to transit-2 (AS3549 Global Crossing) |
| 8218:2031 | prepend once to transit-2 |
| 8218:2032 | prepend twice to transit-2 |
| 8218:2033 | prepend thrice to transit-2 |
One of the following communities will be set on all routes announced to customers:
