Prefix Type
AS20473 tags prefixes that are learned or originated as follows:
| Prefix Type |
Community |
Large Community |
| Prefix learned from Transit |
20473:100 |
20473:100:transit-as |
| Prefix learned from Public Peer via route servers |
20473:200 |
20473:200:ixp-as |
| Prefix learned from Public Peer via bilateral peering |
20473:200 |
20473:200:ixp-as, 20473:200:peer-as |
| Prefix learned from Private Peer |
20473:300 |
20473:300:peer-as |
| Prefix originated by Customer |
20473:4000 |
|
| Prefix originated by 20473 |
20473:500 |
|
| Prefix learned from AS number (if ≤ 65535) |
20473:peer-as |
20473:peer-type:peer-as |
Location
Routes announced from AS20473 are also tagged with a 2-digit community to provide information about the POP it was originated from. For example, prefixes tagged with 20473:11 are generated in Piscataway. These locations are defined in the following table.
United States
| POP Name |
Code |
| Atlanta, GA |
14 |
| Chicago, IL |
13 |
| Dallas, TX |
15 |
| Honolulu, HI |
34 |
| Los Angeles, CA |
17 |
| Miami, FL |
12 |
| Piscataway, NJ |
11 |
| San Jose, CA |
18 |
| Saint Louis, MO |
47 |
| Seattle, WA |
16 |
Other North & South America
| POP Name |
Code |
| Mexico, MX |
28 |
| Santiago, CL |
42 |
| Sao Paulo, BR |
30 |
| Toronto, CA |
33 |
Europe
| POP Name |
Code |
| Amsterdam, NL |
20 |
| Frankfurt, DE |
22 |
| London, GB |
19 |
| Madrid, ES |
31 |
| Manchester, GB |
46 |
| Milan, IT |
38 |
| Paris, FR |
21 |
| Stockholm, SE |
27 |
| Warsaw, PL |
29 |
Asia
| POP Name |
Code |
| Bangalore, IN |
43 |
| Korea, KR |
26 |
| Mumbai, IN |
35 |
| New Delhi, IN |
44 |
| Osaka, JP |
45 |
| Singapore, SG |
25 |
| Tel Aviv, IL |
36 |
| Tokyo, JP |
23 |
Oceania
| POP Name |
Code |
| Melbourne, AU |
32 |
| Sydney, AU |
24 |
Africa
| POP Name |
Code |
| Johannesburg, ZA |
37 |
Large communities are also used for location with the following format 20473:0:3RRRCCC1PP where:
Action Communities
Customers may choose to influence traffic for prefixes advertised outside of AS20473 using the communities below. Customers may also add third party communities which are passed on to our providers and peers. We have incorporated large communities to support actions on 32-bit autonomous system numbers.
IXP route servers use large communities only!
| Action |
Community |
Large Community |
| Do not advertise to specific AS |
64600:peer-as |
20473:6000:peer-as |
| Prepend 1x to specific AS |
64601:peer-as |
20473:6001:peer-as |
| Prepend 2x to specific AS |
64602:peer-as |
20473:6002:peer-as |
| Prepend 3x to specific AS |
64603:peer-as |
20473:6003:peer-as |
| Set Metric to 0 to specific AS |
64609:peer-as |
20473:6009:peer-as |
| Override 20473:6000 to specific AS |
64699:peer-as |
20473:6099:peer-as |
| Do not advertise out of AS20473 |
20473:6000 |
|
| Prepend 1x to all peers |
20473:6001 |
|
| Prepend 2x to all peers |
20473:6002 |
|
| Prepend 3x to all peers |
20473:6003 |
|
| Set Metric to 0 to all peers |
20473:64609 |
|
| Do not announce to IXP peers |
20473:6601 |
|
| Announce to IXP route servers only |
20473:6602 |
|
| Override "do not advertise" for IX route servers & peers |
20473:6603 |
|
| Export blackhole to all peers |
20473:666 |
|
Other BGP Communities
AS20473 transparently advertises communities set by its customers. Customers can use these communities to affect their inbound traffic from our different transit providers and IXPs.