Well, the bridge plugin is apparently running, though it seems you cut the log short, so I can't be sure what comes next. It would be better if you grepped the log for "inventory >172.17.205.19" and made sure to include everything up to the point where it says the inventory job was finished for 172.17.205.19.
Ok, last log was "Job inventory for 172.17.205.19 done."
cat ipdevpoll.log |grep 'inventory 172.17.205.19'
2012-03-23 11:42:15,831 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Job 'inventory' initialized with plugins: ['dnsname', 'typeoid', 'system', 'modules', 'ciscosup', 'bridge', 'interfaces', 'dot1q', 'ciscovlan', 'extremevlan', 'prefix', 'sensors', 'psu', 'lastupdated'] 2012-03-23 11:42:15,833 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] AgentProxy created for 172.17.205.19: <nav.ipdevpoll.snmp.pynetsnmp.AgentProxy object at 0xaec084c> 2012-03-23 11:42:15,868 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Plugin ciscosup wouldn't handle 172.17.205.19 2012-03-23 11:42:15,974 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Plugins to call: DnsName,TypeOid,System,Modules,Bridge,Interfaces,Dot1q,CiscoVlan,ExtremeVlan,Prefix,Sensors,PowerSupplyUnit,LastUpdated 2012-03-23 11:42:15,974 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Starting job 'inventory' for 172.17.205.19 2012-03-23 11:42:15,975 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.dnsname.DnsName(u'172.17.205.19') 2012-03-23 11:42:16,074 [WARNING plugins.dnsname.dnsname] [inventory 172.17.205.19] DNS lookup error for 172.17.205.19: DNSNameError 2012-03-23 11:42:16,074 [WARNING plugins.dnsname.dnsname] [inventory 172.17.205.19] Unable to find PTR record for 172.17.205.19 (19.205.17.172.in-addr.arpa.) 2012-03-23 11:42:16,074 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.typeoid.TypeOid(u'172.17.205.19') 2012-03-23 11:42:18,855 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.system.System(u'172.17.205.19') 2012-03-23 11:42:20,542 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.modules.Modules(u'172.17.205.19') 2012-03-23 11:42:23,376 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.bridge.Bridge(u'172.17.205.19') 2012-03-23 11:52:00,441 [DEBUG plugins.bridge.bridge] [inventory 172.17.205.19] Found 0 base (switch) ports: {} 2012-03-23 11:52:00,441 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.interfaces.Interfaces(u'172.17.205.19') 2012-03-23 11:52:00,671 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.dot1q.Dot1q(u'172.17.205.19') 2012-03-23 11:52:00,689 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.ciscovlan.CiscoVlan(u'172.17.205.19') 2012-03-23 11:52:00,986 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.extremevlan.ExtremeVlan(u'172.17.205.19') 2012-03-23 11:52:00,991 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.prefix.Prefix(u'172.17.205.19') 2012-03-23 11:52:01,231 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.sensors.Sensors(u'172.17.205.19') 2012-03-23 11:52:01,545 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.psu.PowerSupplyUnit(u'172.17.205.19') 2012-03-23 11:52:01,573 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Now calling plugin: nav.ipdevpoll.plugins.lastupdated.LastUpdated(u'172.17.205.19') 2012-03-23 11:52:01,749 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Storing to database complete (160.313 ms) 2012-03-23 11:52:01,752 [DEBUG jobs.jobhandler] [inventory 172.17.205.19] Job inventory for 172.17.205.19 done.