- Bird-users - Mailing Lists

feature request (&&/|| shortcut)
by Arnold Nipper 06 Jan '11

06 Jan '11

First of all a Happy New Year and a prosperous and successfull 2011 to everyone! May all your wishes come through! It looks like BIRD logical && operator is not doing a shortcut. I.e even if you have s.th. like if 0 && $some_complex_expression then ... if 1 || $some_complex_expression then ... BIRD will try to evaluate $some_complex_expression. Would really be great if you could short cut this as you may have situations where the first expression already is false while trying to evaluate 2nd expression may lead to run time errors in that case. In this case you would have to use a nested "if first_expression then if 2nd_expression then" instead of "if first_expression && 2nd_expression then" TIA and best regards, Arnold -- Arnold Nipper / nIPper consulting, Sandhausen, Germany email: arnold(a)nipper.de phone: +49 6224 9259 299 mobile: +49 152 53717690 fax: +49 6224 9259 333

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Problem with case / else: in filters
by Jerome Durand 01 Jan '11

01 Jan '11

Hi all, I'm runnning bird6 version 1.2.5 and bird version 1.2.5 and I'm experiencing a problem: Bird returns a syntax error at the "else:" line while bird6 tells me it's okay. Is this a well known bug or am I doing somethinig wrong? Do you see any workaround? case arg1 { 2: print "two"; print "I can do more commands without {}"; 3 .. 5: print "three to five"; else: print "something else"; Note that I got the version via apt-get on Debian... Thanks!! -- ------------------------------------------------------------- Jerome Durand Responsable des services aux usagers Services operations & support manager Réseau National de Télécommunications pour la Technologie, l'Enseignement et la Recherche Tel: +33 (0) 1 53 94 20 40 | GIP RENATER Fax: +33 (0) 1 53 94 20 41 | 23-25 rue Daviel E-mail: jdurand(a)renater.fr | 75013 PARIS http://www.renater.fr | FRANCE --------------------------------------------------------------

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[PATCH] ospf: Improve calc_next_hop()
by Joakim Tjernlund 27 Dec '10

27 Dec '10

Using the new ospf_pos_to_ifa(), calc_next_hop() can be cleaned up and improved further. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund(a)transmode.se> --- proto/ospf/rt.c | 49 +++++++++++++++++++++++++------------------------ 1 files changed, 25 insertions(+), 24 deletions(-) diff --git a/proto/ospf/rt.c b/proto/ospf/rt.c index 84fea16..d851616 100644 --- a/proto/ospf/rt.c +++ b/proto/ospf/rt.c @@ -1350,37 +1350,38 @@ calc_next_hop(struct ospf_area *oa, struct top_hash_entry *en, if (inherit_nexthops(pn)) return pn; - /* + /* * There are three cases: * 1) en is a local network (and par is root) * 2) en is a ptp or ptmp neighbor (and par is root) * 3) en is a bcast or nbma neighbor (and par is local network) */ - /* The first case - local network */ - if ((en->lsa.type == LSA_T_NET) && (par == oa->rt)) - { - ifa = ospf_pos_to_ifa(oa, pos); - if (!ifa) - return NULL; + if (par == oa->rt) { /* par is root ? */ + if (rtl->type == LSART_VLNK) /* en->lsa.type == LSA_T_RT needed ? */ + return new_nexthop(po, IPA_NONE, NULL, 0); /* No iface ? */ - return new_nexthop(po, IPA_NONE, ifa->iface, ifa->ecmp_weight); - } + ifa = ospf_pos_to_ifa(oa, pos); + if (!ifa) + goto bad; - /* The second case - ptp or ptmp neighbor */ - if ((en->lsa.type == LSA_T_RT) && (par == oa->rt)) - { - if (rtl->type == LSART_VLNK) - return new_nexthop(po, IPA_NONE, NULL, 0); - ifa = ospf_pos_to_ifa(oa, pos); - if (!ifa) - return NULL; - { - struct ospf_neighbor *m = find_neigh(ifa, rid); - if (m && (m->state == NEIGHBOR_FULL)) - return new_nexthop(po, m->ip, ifa->iface, ifa->ecmp_weight); - } - return NULL; + /* The first case - local network */ + if (en->lsa.type == LSA_T_NET) + return new_nexthop(po, IPA_NONE, ifa->iface, ifa->ecmp_weight); + + /* The second case - ptp or ptmp neighbor */ + if (en->lsa.type == LSA_T_RT) + { + if (ifa->type == OSPF_IT_PTP) + return new_nexthop(po, ifa->addr->opposite, ifa->iface, + ifa->ecmp_weight); + else { /* must be PTMP */ + struct ospf_neighbor *m = find_neigh(ifa, rid); + if (m && (m->state == NEIGHBOR_FULL)) + return new_nexthop(po, m->ip, ifa->iface, ifa->ecmp_weight); + } + } + goto bad; } /* The third case - bcast or nbma neighbor */ @@ -1396,7 +1397,7 @@ calc_next_hop(struct ospf_area *oa, struct top_hash_entry *en, * already computed in link_back(). */ if (ipa_zero(en->lb)) - goto bad; + return NULL; /* This is not "bad", may happen intermittent. */ return new_nexthop(po, en->lb, pn->iface, pn->weight); -- 1.7.2.5

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Any IX willing to share their config?
by James Montz 27 Dec '10

27 Dec '10

We are a new Internet Exchange in Minneapolis, MN, USA. Currently evaluating BIRD as our route server. Basic config working in lab with both IPv4 & IPv6 daemon. Would like to see another IX's configuration to see how they are handling filtering, sessions, convention, etc. Thank you in advance, James C. Montz Midwest Internet Cooperative Exchange http://www.micemn.net

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Expression calculation bug?
by Alexander Shikoff 25 Dec '10

25 Dec '10

Hello, There is possible bug in calculation of expressions. Let's assume that bgp_path.first is a 32-bit ASN. Then this line does not work: bgp_community.add((MyASN,bgp_path.first-bgp_path.first/65536*65536)); It does not raise syntax error etc. but bird stops announces of prefix which the adding is applied to. The following workaround works as expected: t = bgp_path.first/65536; t = bgp_path.first - t * 65536; bgp_community.add((MyASN,t)); P.S. I'm still using version 1.2.4. Could someone check it with 1.2.5? -- MINO-RIPE

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'debug' command is birdc
by Alexander Shikoff 24 Dec '10

24 Dec '10

Hello, Would someone be so kind to explain the syntax of 'debug' command in birdc? The description in User's Guide is very short. I need to debug a filtering to/from certain BGP neighbor. I've tried different options: bird> debug ? debug (<protocol> | <pattern> | all) (all | off | { states | routes | filters | interfaces | events | packets }) Control protocol debugging via BIRD logs bird> debug FREEBIT filters syntax error bird> debug BGP filters syntax error bird> debug bgp filters syntax error bird> debug all filters syntax error bird> debug all states syntax error Thanks in advance! -- MINO-RIPE

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BGP: Add support for peering with link-local IPv6 addresses
by Matthias Schiffer 24 Dec '10

24 Dec '10

Hi, the attached patch adds support for using link-local v6 addresses for BGP peerings by adding an interface attribute to the BGP protocol. It has been succesfully tested in a Bird<->Quagga configuration on Linux, and with Bird<->Bird using Linux<->Linux and Linux<->FreeBSD. I know the BGP RFCs (especially 2545) are a bit unclear if this should be allowed, but RFC 4659 suggests it should, and also describes how to set the NEXT_HOP attribute when no global addresses are used. Anyways, I'd love to see this patch included in Bird. It shouldn't make any difference when you don't use the interface attribute, so it won't have bad influence on people not using this feature, and it makes Bird an alternative to Quagga when you need link-local peering support. :-) Matthias Schiffer

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BIRD 1.2.4 segfault on peer removal
by Peter Lieven 22 Dec '10

22 Dec '10

Hi, today we saw Bird 1.2.4 crashing when removing a BGP peer. Dec 22 06:45:00 rs1-ber bird: N194_9_117_45: Down Dec 22 06:45:00 rs1-ber birdcfg.php[17524]: reconfigured, new configuration saved to /etc/bird.conf Dec 22 06:45:00 rs1-ber kernel: [21223257.452937] bird[9393]: segfault at b8085def ip b762211d sp bf897e98 error 4 in libc-2.10.1.so[b75b7000+13e000] Unfortunately, I have no core dump. I can provide the BGP config before and after the reconfiguration. If it helps. Any ideas? Thanks, Peter

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BIRD wiki proposal
by Maciej Drobniuch 22 Dec '10

22 Dec '10

Hi All ! This is most likely a question to Ondrej. Could You create a wiki subdomain/directory so we could act like a community and create simple descriptions/manuals/howto ? The disadvantage of BIRD in this moment is the lack of documentation/description. I/We could support BIRD by creating such things using the wiki. Big thanks in advance! -- Pozdrawiam! Maciej Drobniuch

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Identify empty community list?
by Lars-Johan Liman 21 Dec '10

21 Dec '10

Hi! I'm trying to get a grip on BIRD, and I'm slowly getting there. One thing that puzzles me, though, is how to catch a BGP route entry that has no community list at all. What is the appropriate syntax? I'm runnig out of character combinations to try ... ;-) Non-realistic, but short, example: Accept only routes with empty community. protocol pipe foo { table tbl1; peer table tbl2; mode transparent; import filter { if bgp_community = [] then # <-- WHAT TO WRITE HERE?! accept; reject; }; export all; } I'm looking for something along the lines of a boolean method bgp_community.isEmpty or a way to simulate that. I suppose one could also turn it all around and try to say: if bgp_community ~ [(*,*)] then reject; accept; doesn't work either. You can't say set A is member of set B. I understand that. Cheers, /Lars-Johan Liman #---------------------------------------------------------------------- # Lars-Johan Liman, M.Sc. ! E-mail: liman(a)netnod.se # Senior Systems Specialist ! Tel: +46 8 - 562 860 12 # Netnod Internet Exchange, Stockholm ! http://www.netnod.se/ #----------------------------------------------------------------------

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