Hi, I would like to filter bgp updates based on AS origin. I know that i can match origin with regex as : _1239$ In fact, i would like to match as-path that originate from ASes from 856 to 1239. pseudo regex would be something like : _[856..1239]$ Juniper has this feature. Cisco does not AFAIK. Purpose is try matching AS originated from Ripe/Apnic blocks. The only way to do that would be to use many as-path that match each digits :-(( This is the way i already do to match bogus ASes : ip as-path access-list 150 permit _(6451[2-9]|645[2-9][0-9]|64[6-9][0-9][0-9])_ ip as-path access-list 150 permit _(65[0-4][0-9][0-9]|655[0-2][0-9]|6553[0-5])_ This is not very nice. For Juniper : as-path PRIVATE-DENY ".* (64512-65535) .*"; This is much clearer. Does anybody heard about "as-range" feature on Cisco box ? Thanks Vincent.