January 2020 - Bird-users

[RFC PATCH 00/20] Context typed filters
by Asbjørn Sloth Tønnesen 08 Jan '20

08 Jan '20

This RFC patch series is a first stab, at adding some syntactic sugar making it more plessant to implement non-trivial dual-stack configurations, like https://bgpfilterguide.nlnog.net/ I'm not completely happy with the naming at this stage, but I want to get this series out before 36C3 ends. Looking forward to your feedback. Asbjørn Sloth Tønnesen (20): add NET_ANY make symbol types maskable add new symbol flags for typed symbols add support for defining typed symbols show symbols: don't show typed symbols add initial FI_TYPED_CONSTANT instruction add generic pseudo filter check function add f_has_typed_symbols helper function use net_type when looking up symbols in SYM_FLAG_SAME check show symbol flags in dump filter all check if functions need to be adapted force consistent number of function arguments use FI_TYPED_CONSTANT for typed constants adapt infrastructure adapt protocol filters adapt sh route filters adapt mrt filters allow typed definitions add typed test config add typed documentation conf/cf-lex.l | 75 ++++++++++++++++++++---- conf/conf.h | 58 +++++++++++++----- conf/confbase.Y | 6 +- doc/bird.sgml | 10 ++++ filter/Makefile | 2 +- filter/adapt.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++ filter/config.Y | 28 +++++++-- filter/decl.m4 | 77 +++++++++++++++++++++--- filter/f-inst.c | 42 ++++++++++++- filter/filter.c | 29 +++++---- filter/filter.h | 16 +++++ filter/test.conf | 41 +++++++++++++ lib/net.c | 1 + lib/net.h | 1 + nest/cmds.c | 3 + nest/config.Y | 8 ++- nest/route.h | 1 + nest/rt-show.c | 9 ++- proto/mrt/mrt.c | 17 +++++- proto/mrt/mrt.h | 2 + 20 files changed, 519 insertions(+), 57 deletions(-) create mode 100644 filter/adapt.c -- 2.24.0

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Static route tracking with BFD
by Юрий Иванов 08 Jan '20

08 Jan '20

Hi, I've successfully bring bfd session up with my router. All seems good, but in some cases I will need to flush static route if bfd session comes down. As far as I know BIRD 2.0.7 support this but how to configure it?

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Fwd: [PDB Announce] Call for volunteers for PeeringDB
by Chriztoffer Hansen 07 Jan '20

07 Jan '20

Fwd to bird-users list, because I thought mayhaps (individual_count >= 1) might be interested... Best Regards, Chriztoffer ---------- Forwarded message --------- From: Stephen McManus <smcmanus(a)peeringdb.com> Date: Mon, 6 Jan 2020 at 22:10 Subject: [PDB Announce] Call for volunteers for PeeringDB To: <pdb-announce(a)lists.peeringdb.com> Hi all, We are looking for volunteers to serve on the PeeringDB Admin and Product Committees. The ideal volunteers are industry professionals who are passionate about improving PeeringDB, and ensuring it meets the needs of the community it supports. We are most interested in people who have significant free time to dedicate to these efforts (as much as 4 or more hours a week). Please don’t volunteer if you can’t commit the time! Admin Committee: • Review requests from community members • Authorize users to organizations and networks • Generally keep PeeringDB’s data trustworthy and correct Product Committee: • Review and prioritize requests for improvements to PeeringDB • Work with developers and community members to specify how to solve problems and implement improvements • Set vision for how PeeringDB can help the community in the future If you are interested in either of these roles, and have time you can commit, please let us know at stefan(a)peeringdb.com for the Admin Committee or smcmanus(a)peeringdb.com for the Product Committee. Please include a sentence or two about yourself, why you want to volunteer and how you think you can help. Thanks! -Steve _______________________________________________ Pdb-announce mailing list Pdb-announce(a)lists.peeringdb.com https://lists.peeringdb.com/cgi-bin/mailman/listinfo/pdb-announce

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Follow up question on "next hop self"
by Nico Schottelius 07 Jan '20

07 Jan '20

Hello, I was wondering about how bird solves the following problem with next hop self enabled: R1 <--------> R2 \ / \ / upstream 1 So both routers receive the same routes from upstream and insert them with the same local_pref. With "next hop self" on, both routers will think that the path is not the same and potentially either of the two routers could start routing via the other router instead of via upstream directly. What is the typical approach to solve this situation correctly? Does making setting the local_pref lower if received from an iBGP router make sense in that case? Best regards, Nico -- Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch

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Problem with if statements containing && or || expressions
by mikma.bird＠lists.m7n.se 07 Jan '20

07 Jan '20

Hello, I'm having problems with if statements containing &&, or ||. Why do the config file below cause the following error? $ ./bird -d -l bird: filters, line 8: Argument 2 of AND must be of type bool, got type int bird: bird.conf:15:12 Runtime error while evaluating expression; see log for details # bird.conf function dummy() { return 1; } function test() { if (dummy() != 0) && true then { print "Success"; } return 0; } eval test(); protocol device { interface "*"; } /Mikael

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as-path flter problem
by Marcelo Balbinot 06 Jan '20

06 Jan '20

Hello I'm having difficulty using as-path math expressions Look at my case. correct as-path: 65001 65002 65003 I would like to validate if the as-path of the received prefix conforms to the as-path above. But, I would like to allow prepend of all ASes, so: 65001 65001 65002 65003 is valid 65001 65002 65002 65003 is valid 65001 65002 65003 65003 is valid 65001 65001 65002 65002 65002 65003 65003 is valid 65001 65999 65002 65003 is NOT valid The best expression I found was if (bgp_path ~ [= 65001* 65002* 65003* =]) then but it considers the path '65001 65999 65002 65003' to be valid With regex that would be easier, but with bird bgpmask I couldn't solve it. Any suggestion? -- Marcelo Balbinot IP/MPLS Backbone Manager at AS53062 G G NET Telecomunicações www.gegnet.com.br INOC 53062*100

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