- Bird-users - Mailing Lists

BGP communities
by Fabiano D'Agostino 06 Apr '20

06 Apr '20

Good evening, could someone explain me the meaning of these lines? function bgp_out(int peeras) { if ! (source = RTS_BGP ) then return false; if peeras > 65535 then return true; ### communities do not support AS32 if (0,peeras) ~ bgp_community then return false; if (myas,peeras) ~ bgp_community then return true; if (0, myas) ~ bgp_community then return false; return true; } Thanks, Fabiano

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bird 2.0: show only IPv4 or IPv6 routes from birdc
by Craig Leres 06 Apr '20

06 Apr '20

We've been using bird 1.6.8 to advertise nullzero routes from a FreeBSD box to our routers for awhile. (We use quagga to the same for IPv4.) We're in the process of upgrading to 2.0.7 and will use bird for IPv4 and IPv6. I'm so far unable to come up with good ways of dumping only IPv4 or IPv4 routes. I can't even find concrete examples of what's possible. A filter example I found is: https://bird.network.cz/?get_doc&v=20&f=bird-5.html#ss5.3 show route filter { if 127.0.0.5 ~ net then accept; } So I for IPv6 I tried: show route filter { if net.len = 128 then accept; } which works but it logs error messages: Filter (unnamed) did not return accept nor reject. Make up your mind This works without errors: show route filter { if net.len = 128 then accept; reject; } As does: show route where net.len = 128 Both seem like hacks to me and do not allow unambiguous printing of IPv4 routes: show route where net.len = 32 In my case I know I won't have any IPv6 routes that are 32 bits but there must be a better way. I also found: show route table master4 show route table master6 I'd rather not depend on the names of default routing tables. I suppose I could explicitly import the kernel routes into v4 and v6 tables but routing works without this extra complexity. One experiment I tried was: show route filter { print "net.type is ", net.type; } which logs 1 or 2 for IPv4 or IPv6: bird: net.type is (enum 36)1 bird: net.type is (enum 36)2 but the obvious commands do not print any routes: show route where net.type = 1 show route where net.type = 2 And anyway I couldn't find any keywords for ipv4 and ipv6. What's the magic I'm missing? How can I dump only IPv4 or dump only IPv6 routes? Craig

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BFD state stuck in INIT
by Nisha Nair 06 Apr '20

06 Apr '20

Hello all, I am using bird 1.6.3 on OpenWRT to use BFD. This is our setup: Ubuntu m/c(BIRD running, BFD configured, interface enp2s0) ----------------------------> OpenWRT Box(BIRD running, BFD configured, interface br-lan) The bird configuration on OpenWRT: protocol device { scan time 10; } protocol bfd { neighbor 172.16.2.4; } Bird configuration on Ubuntu m/c: protocol device { debug all; scan time 10; } protocol kernel { scan time 10; metric 64; # Use explicit kernel route metric to avoid collisions # with non-BIRD routes in the kernel routing table import none; # export all; # Actually insert routes into the kernel routing table } protocol bfd { debug all; interface "enp2s0"; neighbor 172.16.2.1; } When the enp2s0 interface IP on the Ubuntu m/c is changed continuously using the ifconfig command, we can see that after few tries, the bfd session state is stuck at INIT and only a restart of the bird4 daemon brings the bfd session UP. Enabling the bfd debugs on the PC shows the following error: bird: bfd1: Socket error: bind: Cannot assign requested address Debug logs on the Ubuntu m/c: bird: bfd1: Sending CTL to 172.16.2.1 [Up] bird: bfd1: CTL received from 172.16.2.1 [Up] bird: bfd1: Sending CTL to 172.16.2.1 [Up] bird: bfd1: Session to 172.16.2.1 removed bird: bfd1: Session to 172.16.2.1 added bird: bfd1: Sending CTL to 172.16.2.1 [Down] bird: bfd1: Sending CTL to 172.16.2.1 [Down] bird: bfd1: Sending CTL to 172.16.2.1 [Down] bird: bfd1: Session to 172.16.2.1 removed bird: bfd1: Socket error: bind: Cannot assign requested address bird: bfd1: Session to 172.16.2.1 added bird: bfd1: CTL received from 172.16.2.1 [Down] bird: bfd1: Session to 172.16.2.1 changed state from Down to Init bird: bfd1: CTL received from 172.16.2.1 [Down] bird: bfd1: CTL received from 172.16.2.1 [Down] bird: bfd1: CTL received from 172.16.2.1 [Down] bird: bfd1: CTL received from 172.16.2.1 [Down] bird: device1: Scanning interfaces It looks like a timing issue as the number of times we need to change the interface IP to reproduce the issue is different each time, but it is reproduced consistently. These are the steps we repeated on our Ubunutu PC till the state show INIT and is stuck there: 1. ifconfig enp2s0 192.168.2.44 2. ifconfig enp2s0 192.168.2.4 3. birdc4 show bfd session The post https://bird.network.cz/pipermail/bird-users/2020-January/014183.html reports the same issue. There seems to be no suggestions on the thread. It would be really helpful if you could look in to this and let me know if there is any workaround for this problem other than a restart, because we have a script running which polls the bfd status and reports to the application above. It does not seem sensible to just restart the bird daemon when an INIT state is encountered. Any help is much appreciated. Thank you, Nisha Muraleedharan

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[BGP] MRAI connection-based implementation review
by Mattia Milani 06 Apr '20

06 Apr '20

Hello to everyone, in the past months I have implemented the MRAI timer in the BGP protocol and I would like to ask you guys how can I submit this code in order to receive a review form someone more expert than me? My implementation is on a connection-based approach timer and now I'm working on the destination based timer. I have also inserted some new keywords to control this timer from the configuration file. I'm not sure my code is 100% correct, but from the tests that I have done it works. Thanks for the help, Mattia

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Build for Debian MIPS
by Ross Tajvar 05 Apr '20

05 Apr '20

Hi, I am currently using BIRD 1.6.3 on an Edgerouter Pro. The CPU architecture is MIPS and the OS is based on Debian Stretch. Because of the latter, I can use the Debian package repos to install BIRD 1.6.3, however I would like to upgrade to BIRD 2 which does not have a package built. I noticed there is another repo (located at http://bird.network.cz/debian) which maintains BIRD 2 for Debian Stretch, however those packages are not built for the MIPS architecture. I tried building the package myself in a virtual system emulated with qemu, but the build failed with the following error: > obj/lib/fletcher16_test 2>/dev/null && touch obj/lib/fletcher16_test.ok > obj/lib/fletcher16_test: t_fletcher16_compute 0.007899378s > [FAIL] > obj/lib/fletcher16_test: t_fletcher16_checksum 0.004199340s > [FAIL] > obj/lib/fletcher16_test 0.015348769s > [FAIL] > Makefile:180: recipe for target 'obj/lib/fletcher16_test.ok' failed > make[1]: *** [obj/lib/fletcher16_test.ok] Error 1 > make[1]: Leaving directory '/root/src/debian/bird2-2.0.7' > dh_auto_test: make -j1 test VERBOSE=1 returned exit code 2 > debian/rules:21: recipe for target 'build' failed > make: *** [build] Error 2 > dpkg-buildpackage: error: debian/rules build gave error exit status 2 > debuild: fatal error at line 1116: > dpkg-buildpackage -rfakeroot -us -uc -b failed Would it be possible to add MIPS as a build target for the bird.network.cz repo? Thanks, Ross

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How to see as path
by Fabiano D'Agostino 03 Apr '20

03 Apr '20

Good morning, how can I see the as path of a route? I think the command is 'show route' and I get: 192.168.5.0/24 unicast [bgp1 ...]*(100) [AS3i] via.. What is 100? AS3 should be the as path, right? Why is there an 'i'? Thanks, Fabiano

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BGP FlowSpec Route-reflector
by vincent.ma＠gmx.fr 30 Mar '20

30 Mar '20

Hello, I'm trying to advertise bgpflowspec route from sflow-rt to bird. I have only "Import withdraws" although I send updates routes. Can you help me please ? bird> show protocol all sflow Name Proto Table State Since Info sflow BGP --- up 15:33:04.256 Established BGP state: Established Neighbor address: 192.168.10.3 Neighbor AS: 65000 Local AS: 65000 Neighbor ID: 192.168.10.3 Local capabilities Multiprotocol AF announced: ipv4 flow4 Route refresh Graceful restart 4-octet AS numbers Enhanced refresh Long-lived graceful restart Neighbor capabilities Multiprotocol AF announced: ipv4 ipv6 flow4 flow6 4-octet AS numbers Session: internal multihop AS4 Source address: 192.168.10.2 Hold timer: 122.161/180 Keepalive timer: 33.965/60 Channel flow4 State: UP Table: flowtab4 Preference: 100 Input filter: ACCEPT Output filter: ACCEPT Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 4 0 --- 4 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 BGP Next hop: 192.168.10.2 Channel ipv4 State: UP Table: master4 Preference: 100 Input filter: ACCEPT Output filter: ACCEPT Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 1 0 --- 1 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 BGP Next hop: 192.168.10.2 IGP IPv4 table: master4 ---- bird.conf : router id 192.168.10.2; flow4 table flowtab4; protocol bgp client1 { debug all; local 192.168.10.2 as 65000; neighbor 192.168.10.1 as 65000; flow4 { import all; export all; }; ipv4 { import all; export all; }; } protocol bgp sflow { debug all; local 192.168.10.2 as 65000; neighbor 192.168.10.3 port 1179 as 65000; flow4 { import all; export all; }; ipv4 { import all; export all; }; }

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Re: IPv6 BGP & kernel 4.19
by Alarig Le Lay 29 Mar '20

29 Mar '20

We agree then, and I act as a router on all those machines. Le 3 décembre 2019 19:27:11 GMT+01:00, Vincent Bernat <vincent(a)bernat.ch> a écrit : >This is the result of PMTUd. But when you are a router, you don't need >to do that, so it's mostly a problem for end hosts. > >On December 3, 2019 7:05:49 PM GMT+01:00, Alarig Le Lay ><alarig(a)swordarmor.fr> wrote: >>On 03/12/2019 14:16, Vincent Bernat wrote: >>> The information needs to be stored somewhere. >> >>Why has it to be stored? It’s not really my problem if someone else >has >>a non-stantard MTU and can’t do TCP-MSS or PMTUd. >> >>-- >>Alarig > >-- >Sent from my Android device with K-9 Mail. Please excuse my brevity. -- Envoyé de mon appareil Android avec Courriel K-9 Mail. Veuillez excuser ma brièveté.

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Bird on Scientific Linux
by Fabiano D'Agostino 28 Mar '20

28 Mar '20

Hi all, I am using Scientific Linux 6 (RHEL 6) and I was able to install Bird 1.3.6, but when I try to install Bird 2.0.7 I get same errors? Why? Thanks in advance, Fabiano

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Upgrade from Bird 1.3.6 to Bird 2.0.7
by Fabiano D'Agostino 28 Mar '20

28 Mar '20

Hi all, is there any easy way to upgrade from Bird 1.3.6 to Bird 2.0.7? Thanks, Fabiano D'Agostino

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