Many thanks!
Vladislav grishin -----Original Message----- From: owner-bird-us...@atrey.karlin.mff.cuni.cz [mailto:owner-bird-us...@atrey.karlin.mff.cuni.cz] On Behalf Of Ondrej Filip Sent: Wednesday, July 07, 2010 11:49 PM To: Vladislav grishin Cc: bird-us...@trubka.network.cz Subject: Re: Explain a difference between filters?? On 7.7.2010 16:00, Vladislav grishin wrote: > > Why filters export_net_1 and export_net_2 work equally, and/but filters > export_default_1 and export_default_1 on a miscellaneous? > Why the filter export_default_2 "does not work" also as the filter > export_net_2 works? Hi Vladislav, this clause: net ~ 1.0.0.0/8 means "NET is subnetwork (of network itself) of 1.0.0.0/8". So networks like 1.1.0.0/16 or 1.0.0.0/8 are accepted by the filter. But this clause: net ~ [ 1.0.0.0/8 ] means "NET is a member of prefix list (prefix list is in []) with a single member 1.0.0.0/8. So basically only 1.0.0.0/8 is matched. That's why export_default_1 accepts just default route (0.0.0.0/0) and export_default_2 accepts default route and all subnetworks. So your filters export_net_1 and export_net_2 are not equal. The filter export_net_2 would e.g. accept route 12.12.12.13/32, but that is probably not in your routing table. "net ~ [ 1.0.0.0/8]" is equal with "net = 1.0.0.0/8" Ondrej F. > > Vladislav Grishin >
