Ave, I am not sure, if I totally understand what you're trying to achieve.
Do you think bird is behaving different for a not bird endpoint like the Mikrotic? Independent of your problem a general approach for debugging bgp awkwardness. I love to use tcpdump and Wireshark to see what's going on, so you do not have to rely on debug output or built-in counters. Rgds, SJ Ave <[email protected]> schrieb am Mo., 29. Juni 2020, 00:50: > Hello, > > I believe I stumbled upon a bug in BIRD 2.x while doing something that can > only be summed up as "testing things on someone else's network with limited > access provided to me". > > When peering over IPv4 yet exporting a full table, I am noticing that all > exports, withdraw or update, are exported as withdrawals. > > Export side: > > Routes: 0 imported, 85839 exported, 0 preferred > Route change stats: received rejected filtered ignored > accepted > Import updates: 0 0 0 > 0 0 > Import withdraws: 0 0 --- > 0 0 > Export updates: 85840 0 0 --- > 85840 > Export withdraws: 0 --- --- > --- 0 > > Import side: > > Routes: 0 imported, 0 exported, 0 preferred > Route change stats: received rejected filtered ignored > accepted > Import updates: 0 0 0 > 0 0 > Import withdraws: 85823 0 --- > 85823 0 > Export updates: 0 0 0 > --- 0 > Export withdraws: 0 --- --- > --- 0 > > I've also tested with an instance where there were both updates and > withdrawals exported, and as a result a sum of both were displayed as > imported withdrawals. > > The configurations I've tested with are quite simple: > > Full import config (seems to import "correctly", but as exports seem to be > faulty it all gets recorded as withdrawals): > > > log syslog all; > > router id 192.168.4.22; > > protocol device { > > scan time 5; > > } > > > > protocol bgp bird1 { > > local 192.168.4.22 as 65529; > > neighbor 192.168.4.1 as 65530; > > multihop; > > > > ipv6 { > > import all; > > export none; > > }; > > } > > Trimmed export config that doesn't export correctly: > > > protocol bgp bird2 { > > local 192.168.4.1 as 65530; > > neighbor 192.168.4.22 as 65529; > > multihop; > > > > ipv6 { > > import none; > > export all; > > }; > > } > > Things I've so far: > > - Doing BGP4 over IPv4 (renaming "ipv6" blocks to "ipv4" in configs). This > had no issues, exports and imports were correct. > - Doing BGP4 over IPv6 (doing same change as last point, plus changing > IPv4 addresses to IPv6 ones in configs). This had no issues, exports and > imports were correct. > - Switching from IPv4 to IPv6 (changing IPv4 addresses to IPv6 ones in > configs). This resulted in proper imports, hinting that problem only > happens on BGP6 over IPv4. > - Exporting to a non-bird2 BGP daemon. Specifically, I exported to a > mikrotik router running ROS v6.46.6. It also classified these as > withdrawals ("Withdrawn Received 85 979", with empty "Prefix Count" > and "Updates Received"). > > Thanks and I hope I'm not just doing something wrong and wasting your time > as a result, > Ave >
