November 2018 - Bird-users

Incomprehensible error concerning identical babel config for bird and bird6 (bird-v1.6.4 on ubuntu18.04.1)
by Christoffer Hansen 17 Nov '18

17 Nov '18

Hi fellow bird users. I have a question concerning the syntax error message shown below for the bird daemon. But NOT for the bird6 daemon. Even thou the configuration snippet in bird.conf & bird6.conf is identical. Any educated guesses as to what might be causing this? cat /etc/bird/bird.conf (...) 36 # babel 37 ######## 38 39 protocol babel { 40 interface "wg-server" { 41 type wireless; 42 }; 43 export where (source = RTS_DEVICE) || (source = RTS_BABEL); 44 } (...) $ bird -p bird: /etc/bird/bird.conf, line 39: syntax error cat /etc/bird/bird6.conf (...) 36 # babel 37 ######## 38 39 protocol babel { 40 interface "wg-server" { 41 type wireless; 42 }; 43 export where (source = RTS_DEVICE) || (source = RTS_BABEL); 44 } (...) $ bird6 -p <<empty_output>> Regards, Christoffer -- Bird user and participant in the DN42 network. --

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Detailed view for show ospf lsadb
by Lukas Liebig 16 Nov '18

16 Nov '18

Hello, I'm comparing BIRD with Quagga in order to evaluate if we should switch to BIRD. Therefore, I have two questions: 1) I have attached two screenshots of the LSA databases of BIRD and Quagga. BIRD enables many output filtering features but I always get only a table-like representation of the LSA database. The Quagga shell can also display detailed LSA information, for instance the attached image for a type 5 LSA. Most information can also be found within birdc but the Forward Address for example cannot. Or is there a command in birdc, I did not notice? If not, is it planned to display more detailed LSA information for further BIRD releases? 2) On various websites and presentations people talk about BIRDs better performance and lower resource usage compared with Quagga. Here [1] one can even see diagrams but there is now further information given about the taken measurements. Are there studies which compare BIRD and Quagga in an objective and comprehensible way? Best regards, Lukas Liebig [1]: https://www.uknof.org.uk/uknof15/Preston-Routeserver.pdf

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BPG inbound filtering based on origin as-path and communities - configuration review (moving from quagga to bird)
by Shahan Agha 15 Nov '18

15 Nov '18

Hi All, I am working on migrating some systems from quagga to bird and would like to have some details regarding the filtering and how to set this up. Currently we are doing inbound bgp filtering based on as-path access-lists, prefix-lists and communities. Since i dont have much familiarity with Bird and more familiar with Cisco (quagga is quite similar), i would appreciate if the Bird configuration can be reviewed, *Currently on quagga we are doing it the following way: * ! neighbor X.X.X.X route-map route-in in ! route-map route-in permit 10 match as-path as-in set local-preference 99 ip as-path access-list as-in permit _ 1234 _ ip as-path access-list as-in permit _5678_ ! route-map route-in permit 11 match community route-in-direct set local-preference 110 ip community-list standard route-in-direct permit 1010:2020 ! route-map route-in permit 12 match community route-in-eu set local-preference 121 ip community-list standard route-in-eu permit 3030:4040 ip community-list standard route-in-eu permit 5050:6060 ! route-map route-in permit 13 ! *Goals to achieve: * 1. Block my fixed pulic ip address block to be advertised back to me in order to avoid any sort of loops 2. If some traffic is originated from specific origin ASN like in Cisco quagga the expression is _ 1234 _ , set their local preference to 110. This needs to be done for multiple origin ASNs. 3. Route received with one specific community should have its local preference set to 110 4. Set local preference to 99 matching specific set of communities. *Future Bird configuration: * function ebgp_in() prefix set my_public; { #Goal. 1 my_public = [ 12.13.14.0/22+ ]; if net ~ my_public then return false; #Goal. 2 if bgp_path ~ [(= * 1234 * =),(= * 4567 * =) ] bgp_local_pref = 99; } #Goal. 3 if bgp_community ~ [(1010,2020)] then { bgp_local_pref = 110; } #Goal. 4 if bgp_community ~ [(3030,4040),(5050,6060)] then { bgp_local_pref = 121; } return true; } I would really appreciate if bird experts could help me with this. ;) Thanks, Agha

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How to make BIRD use the kernel routing metric?
by Lukas Liebig 14 Nov '18

14 Nov '18

Hello, I use BIRD 2.0.2 and want the OSPF daemon to announce the Linux kernel routing metric. For instance, if I run "ip route add table 44 to 10.2.3.0/24 metric 1234 dev eth0", I want this route to propagate into BIRD. Therefore I use the kernel protocol configured like this: protocol kernel { ipv4 { export all; import all; }; learn; kernel table 44; scan time 10; } My OSPF instance reads data from table master4. "show ospf state" displays my kernel route as "external", but with "metric2 10000". According to the documentation https://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.6 I tried to use metric 0; but without any effect. Do I overlook something essential? Best regards Lukas Liebig

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How to announce OSPF host route for unnumbered interfaces?
by Kenth Eriksson 14 Nov '18

14 Nov '18

Hi! How can I announce one OSPF host route for all my unnumbered interfaces? I don't want to inject it as a static route and export it as such. Thanks, Kenth

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Quick yes / no question about BGP in Bird 1.x.
by Grant Taylor 08 Nov '18

08 Nov '18

Does Bird 1.x support both IPv4 and IPv6 prefixes being advertised over the same BGP neighbor session, which happens to be IPv4 connected? I've not done any research about this specific question yet and I'm just hoping for a "yes it does" or "no it does not" answer. Thank you in advance. Now to go find some coffee and start my day. - I'll do more research this afternoon. -- Grant. . . . unix || die

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[PATCH] Fix Bird/Bird6 wrong LSA collisions detection
by Mikkelsen, Asbjorn 08 Nov '18

08 Nov '18

Bird/Bird6 can wrongly report wrong LSA collisions and stop working. A route fib can in certain cases be released (believing nobody are using them) and still be used (but not dereferenced). A PR can be found here: https://github.com/BIRD/bird/pull/3

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redesigned version of bgp in bird2 changes the rs client behaviour
by Alexander Zubkov 06 Nov '18

06 Nov '18

Hello, I found out that bird version 2 prepends its ASN when exporting to eBGP peer and "rs client" option enabled. I made some investigation and found out that bgp code was hardly redesigned and the logic of "rs client" was changed. Here is v1. https://gitlab.labs.nic.cz/labs/bird/blob/fff79b1c1e0577f487b4fb67f79a74b05… if (!p->is_internal && !p->rs_client) { bgp_path_prepend(e, attrs, pool, p->local_as); And this is in v2 now. https://gitlab.labs.nic.cz/labs/bird/blob/e19d08055a4614f03e51ee72617be1094… if (p->is_internal || (p->rs_client && src && src->rs_client)) { If I get it right, it does not prepend its ASN only in the case when route was received from BGP session too and that session is marked "rs client". So only prefixes from one "rs client" to another is not prepended. It looks like it is impossible now to skip prepend for eBGP for some local routes, for example. I wish it was made an old style way - when "rs client" skips prepend unconditionally.

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change routing while exporting to kernel
by Michael Schwartzkopff 06 Nov '18

06 Nov '18

hi, I want to export a route learned from BGP to the kernel. but I want to modify the route while exporting because I want to use a VTI instead of the next hop route. So instead of 192.168.0.0/24 via 10.0.0.1 I want to export 192.168.0.0/24 dev vti0 to the kernel. Is this possible with bird? If yes, how can I acchieve this? Mit freundlichen Grüßen, -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein

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Re: BIRD 2.0.2 segfaulting
by Ondrej Zajicek 06 Nov '18

06 Nov '18

On Tue, Nov 06, 2018 at 01:56:29PM +0700, Clemens Schrimpe wrote: > > You can use filters: show route table r4 where net.asn = 4711 > > But > > show route table r4 where net = 1.1.1.0/24 > or even > show route table r4 for 1.1.1.1 > > doesn’t work. It that by design or just an oversight? Confusingly, 'net' represents whole route key, not just prefix. For IP route it is just prefix, while for ROA it is prefix, maxlen and asn. Its parts can be accessed using kewords ip, len, maxlen and asn. Therefore, this should work: show route table r4 where net.ip = 1.1.1.0 But note that like all 'show route where' variants, it has ti iterate through whole routing table. (Unlike show route NET. which does direct lookup). -- Elen sila lumenn' omentielvo Ondrej 'Santiago' Zajicek (email: santiago(a)crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."

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