Performs BGP table lookup based on AS_PATH regular expression.
Supported BGP AS Path Expressions
Supported AS Path Patterns
VTS Looking Glass runs on Junos routers, so AS_PATH expressions use Junos syntax, where _ finds nothing:
| Expression |
Match |
.* 65000 |
Originated by AS65000 |
.* 65000 .* |
Contains AS65000 |
65000 .* |
Learned directly from AS65000 |
Performs BGP table lookup based on Extended or Large community value.
VTS BGP Communities
BGP Communities
VTS Looking Glass tags every route with these AS37721 communities. Route lookups show what each value means.
| Range |
Meaning |
Set by |
37721:1000 2000 3000 4000 9000 |
Learned from: AS37721, a customer, an IX peer, an upstream or a partner |
VTS |
37721:1100–1400 |
VTS prefixes by origin continent |
VTS |
37721:4001–4099, 9001–9099 |
Which upstream or partner network |
VTS |
37721:16000–18999 |
Where learned: country, VTS site, IX |
VTS |
37721:80–310 |
Local preference |
Customer |
37721:5000–5003, 6001–6004, 6930–6993 |
Announcement control: all neighbors, by continent, by relationship |
Customer |
37721:4:ASN, 37721:61:ASN–63:ASN (large) |
Announcement control for one neighbor AS |
Customer |
37721:666, 65535:666 |
Blackhole |
Customer |
Older codes (37721:5MMN, 11000–14999, 31xx–34xx, 42xx–44xx, 91xx–94xx) still appear on routes and are listed under "Legacy codes".
Read the full community reference on as37721.net
