- Bird-users - Mailing Lists

protocol pipe and bgp
by Eugene M. Zheganin 09 Feb '19

09 Feb '19

Hello, If I have pipe between two kernel routing tables, which, in turn, are filled with two different BGP protocols, when these routes are exported from kernel FIB via pipe, do they retain their BGP attributes like BGP preference ? Or, if this question is more clear, does the following statement for an pipe filter look sane ? filter exportfib0tofib2 { if source = RTS_BGP then { print "fib0 to fib2 export: net accepted: ", net; bgp_local_pref = 25; accept; } else { print "fib0 to fib2 export: net rejected: ", net; reject; } } or should I operate generifc protocol preference instead ? I'm asking because I created BGP/PIPE configuration when the last established BGP session seems to get the maximum preference when exported via pipe, if you know what I mean. Thanks. Eugene.

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enforce-first-as disable
by firas73737＠yahoo.com 07 Feb '19

07 Feb '19

Hello BIRD Users, "enforce-first-as disable" is a BGP option that can be configured for a BGP neighbor on a Cisco router. It is usually configured when the neighbor is a route server as route servers do not add their AS to the AS path of the prefixes they advertise. If I configure BIRD to BGP peer with a route server, how can I configure this option please? I do not find it in BIRD user guide. Thanks in advance!Firas

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1.6.5 and 2.0.3 packages?
by Cybertinus 07 Feb '19

07 Feb '19

Hello Bird users, Is there any ETA for the packages for Bird 1.6.5 and 2.0.3? I'm running a production network with Bird and I want to upgrade my Debian routers to the latest version of Debian. I was planning on combining this with the upgrade from Bird 1.6.4 to 1.6.5, in order to have downtime only once instead of two times. Furthermore I'm doing RPKI validation at the moment with 1.6.x, but the somewhat hacky way in which I'm doing this is falling apart now, so I think I need to upgrade to Bird 2.0.x in the near future, so I can use the RTR protocol and do RPKI validation in a way less hacky way. But for both I need Debian packages :). I know this e-mail can come across like I'm pushing hard for packages, but I hope you understand that it isn't meant that way. I would like to know when the packages are expected to be available, so I can start planning my next actions and have my network running as smoothly as possible with the most current versions of the software. Kind regards, Cybertinus

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route export number discrepancy
by michal.nowak＠lnk.ro 06 Feb '19

06 Feb '19

Hi list, We've upgraded to 2.0.3 (from 1.6.3) and observed that the number of exported routes shown in the protocol details ('show protocol all') does not match (by large) these show in 'show route export PROTOCOL count'. In the below example we can see that the protocol export counters are at some crazy values. # birdc show proto all DIACONESCU_V4 | grep exported Routes: 16 imported, 0 filtered, 4294965736 exported While we actually export only 3 routes. # birdc show route export DIACONESCU_V4 count BIRD 2.0.3 ready. 3 of 726536 routes for 724797 networks in table main4. Now, what is interesting is that the exported count changes periodically. i.e. Routes: 16 imported, 0 filtered, 4294967283 exported Routes: 16 imported, 0 filtered, 4294967293 exported At this stage I believe this is related to protocols that export a only a few routes (rather than full tables). I've been able to reproduce this in lab using the production config and then ran the following tests: 1) changing export to none, reconfigure - did not clear the counters - looking at the code counters are reset on refeed, so perhaps that does not happen here 2) disabling and enabling the protocol - it briefly shows the correct count (3) and then goes back to a crazy number almost immediately. 3) restarting bird - the counters clear up and then some random time later the crazy number pops up again. Has anyone else on the list experienced this? I'd be happy to provide more info if needed, but at the moment not really sure what to make out of it. Also, can I ask why the preferred routes were removed from the protocol summary in bird 2 i.e. the below? Routes: 722830 imported, 0 filtered, 1 exported, 3648 preferred

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Bird 2 on debian?
by Alarig Le Lay 06 Feb '19

06 Feb '19

Hi, I added the upstream repo (deb http://bird.network.cz/debian/ stretch main) because bird2 is not in the debian one (even with sid!) and I need flowspec. https://bird.network.cz/?get_doc&v=16&f=bird-6.html never mentions RFC5575 while https://bird.network.cz/?get_doc&v=20&f=bird-6.html does. But I’m still stuck with bird1: root@hv01:~# apt policy bird bird: Installed: 1.6.4-1+0~20180515164830.3+stretch~1.gbpe9ef50 Candidate: 1.6.4-1+0~20180515164830.3+stretch~1.gbpe9ef50 Version table: *** 1.6.4-1+0~20180515164830.3+stretch~1.gbpe9ef50 500 500 http://bird.network.cz/debian stretch/main amd64 Packages 100 /var/lib/dpkg/status 1.6.3-2 500 500 http://mirror.grifon.fr/debian stretch/main amd64 Packages So, what’s the best way to get bird2 on debian without compiling it on each server? Thanks, -- Alarig

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tm_format_time output changes by +/1 second
by Ilya Evseev 05 Feb '19

05 Feb '19

Hi all! There is a problem in time output. Consider timeformat protocol "%Y-%m-%d %H:%M:%S"; Just call "birdc show proto": === BIRD 1.6.5 ready. name proto table state since info static1 Static master up 2019-02-03 14:59:33 kernel1 Kernel master up 2019-02-03 14:59:33 device1 Device master up 2019-02-03 14:59:33 === Then call it again: === BIRD 1.6.5 ready. name proto table state since info static1 Static master up 2019-02-03 14:59:32 kernel1 Kernel master up 2019-02-03 14:59:32 device1 Device master up 2019-02-03 14:59:32 === As you can see, time is changed by 1 second. That's bad for monitoring when it's configured to alert on time/state changes. Quick fix for me: === --- timer.c.orig 2019-02-03 15:06:44.388749890 +0300 +++ timer.c 2019-02-03 16:25:49.767532769 +0300 @@ -302,10 +302,9 @@ tm_format_time(char *x, struct timeformat *fmt, btime t) { btime dt = current_time() - t; - btime rt = current_real_time() - dt; int v1 = !fmt->limit || (dt < fmt->limit); - if (!tm_format_real_time(x, TM_DATETIME_BUFFER_SIZE, v1 ? fmt->fmt1 : fmt->fmt2, rt)) + if (!tm_format_real_time(x, TM_DATETIME_BUFFER_SIZE, v1 ? fmt->fmt1 : fmt->fmt2, t)) strcpy(x, "<error>"); } === Ilya

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BGP update schedule problem
by Mattia Milani 04 Feb '19

04 Feb '19

Hello all, I don't know if anyone can help me but this is my problem: I want to trigger an UPDATE message in some situations, so I inserted a: bgp_schedule_packet(pr->conn, ch, PKT_UPDATE); In the point that I want to schedule it, pr->conn and ch refer to the correct connection and channel where I want to send the UPDATE. My question is now how can I trigger the sending of the UPDATE? because looking in the logs I correctly schedule the UPDATE but it isn't sent after a while. Thanks, Mattia

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Way too many routes imported in OSPF
by Alarig Le Lay 29 Jan '19

29 Jan '19

Hi, I’ve set up an OSPF as an IGP to resolve the BGP next-hops on the routes learned from eBGP sessions. On one of my border routers (running FreeBSD), the counters are correct: root@nominoe:~ # birdc 'show protocols all "ospf_*"' BIRD 2.0.2 ready. Name Proto Table State Since Info ospf_ipv4 OSPF master4 up 16:29:14.755 Running Channel ipv4 State: UP Table: master4 Preference: 150 Input filter: (unnamed) Output filter: (unnamed) Import limit: 200 Action: block Routes: 59 imported, 0 filtered, 26 exported Route change stats: received rejected filtered ignored accepted Import updates: 114 0 0 0 114 Import withdraws: 43 0 --- 0 43 Export updates: 4343089 79 4342789 --- 221 Export withdraws: 25677 --- --- --- 195 ospf_ipv6 OSPF master6 up 16:29:14.755 Running Channel ipv6 State: UP Table: master6 Preference: 150 Input filter: (unnamed) Output filter: (unnamed) Import limit: 200 Action: block Routes: 16 imported, 0 filtered, 13 exported Route change stats: received rejected filtered ignored accepted Import updates: 178 0 0 0 178 Import withdraws: 161 0 --- 0 161 Export updates: 210288 168 210107 --- 13 Export withdraws: 4415 --- --- --- 0 On the other (running Gentoo), I can’t have so much: asbr02 ~ # birdc 'show protocols all "ospf_*"' BIRD 2.0.3 ready. Name Proto Table State Since Info ospf_ipv4 OSPF master4 up 17:07:45.751 Running Channel ipv4 State: UP Table: master4 Preference: 150 Input filter: (unnamed) Output filter: (unnamed) Import limit: 200 Action: block Routes: 64 imported, 0 filtered, 4294120544 exported Route change stats: received rejected filtered ignored accepted Import updates: 258 0 0 0 258 Import withdraws: 181 0 --- 0 181 Export updates: 2107116 242 2106865 --- 9 Export withdraws: 21844 --- --- --- 846761 ospf_ipv6 OSPF master6 up 17:02:14.667 Running Channel ipv6 State: UP Table: master6 Preference: 150 Input filter: (unnamed) Output filter: (unnamed) Import limit: 200 Action: block Routes: 19 imported, 0 filtered, 4294870086 exported Route change stats: received rejected filtered ignored accepted Import updates: 204 0 0 0 204 Import withdraws: 185 0 --- 0 185 Export updates: 325977 194 325773 --- 10 Export withdraws: 10926 --- --- --- 97220 asbr02 ~ # birdc 'show route count table master4' BIRD 2.0.3 ready. 2461149 of 2461149 routes for 737465 networks in table master4 asbr02 ~ # birdc 'show route count table master6' BIRD 2.0.3 ready. 239266 of 239266 routes for 63527 networks in table master6 I already tried to restart the protocols, but it doesn’t change anything. Any idea? Thanks, -- Alarig

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Default config file name 1.6 vs. 2.0
by Eugene Crosser 28 Jan '19

28 Jan '19

Hello, I would like to suggest to change the default name of the configuration file for bird version 2.0. The two bird versions cannot use the same file because of syntax change. And some of us distribute the file via configuration management tools (like ansible etc.). This makes upgrade path rather difficult and unnecessarily error-prone: you need to synchronize exchange of the version of the configuration file with upgrade (or downgrade! That can be necessary too!) of the bird package. Whereas if different versions used different files, you could distribute both files with you configuration management tool in advance, and then gradually upgrade the package, with easy rollback if things do not go well. Even if configuration management is not used, it is still more convenient to be able to start one or the other version of the daemon without the need to specify alternative configuration, or replacing the file. Thanks for consideration! Eugene

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Exporting multipath link routes from Linux kernel
by Eugene Crosser 28 Jan '19

28 Jan '19

Hello all, we do virtual hosting, and we provide routeable /32 addresses to the guests. Kernel routes on the KVM host are link routes that look like this: 1.0.0.113 dev pub020304050612 proto static They are picked up by bird and exported to the core router. When we launch multiple guests with the same address on multiple hosts, this results in an ECMP route on the core router, providing load balancing. This all works fine until we launch more than one guest with the same address on _one_ host. We create kernel multipath route that looks like this: 1.0.0.115 proto static metric 10 nexthop dev pub020304050612 weight 1 nexthop dev pub020304050616 weight 1 Note that there is no "via" address in the hop configulations! This actually works, i.e. connections originating from the host are balanced between those guests. But bird refuses to pick up such route because of the code here: https://gitlab.labs.nic.cz/labs/bird/blob/master/sysdep/linux/netlink.c#L528 Questions: 1. What was the justification for disallowing gateway-less multipath routes? Would it make sense to allow them (in the mainstream code)? 2. Would it be sufficient to simply drop the check for the presence of the gateway address in the message, and return `first` even if gateway address was not present? Thank you, Eugene

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