May 2012 - Bird-users - Mailing Lists

upgrade 1.2.4 - 1.3.1 reverted
by Arjan Filius 24 Oct '12

24 Oct '12

Hello, upgraded from bird 1.2.4 to bird 1.3.1 last weekend, but needed to revert due to complaints from high bgp traffic to bgpmon.net and 100% cpu load on a 2x bird bgp routers setup connected with iBGP. Did some research, and noticed a high bgp traffic situation on the iBGP sessions (about 10.000 bgp packets in 1.7 second) Based on graph statistics, i noticed a irregular traffic on the trans-ip's as well (noticed after rollback in statistical graphs) In the logging (mostly on the first bgp router) , i noticed quite some messages (33414 in ~12h) like: 29-05-2011 10:57:49 <WARN> Next hop address X.X.X.242 resolvable through recursive route for X.X.X.0/24 29-05-2011 10:57:49 <WARN> Next hop address Y.Y.35.194 resolvable through recursive route for Y.Y.32.0/19 29-05-2011 10:57:52 <WARN> Next hop address X.X.X.241 resolvable through recursive route for X.X.X.0/24 29-05-2011 10:57:52 <WARN> Next hop address X.X.X.242 resolvable through recursive route for X.X.X.0/24 29-05-2011 10:57:55 <WARN> Next hop address Y.Y.35.194 resolvable through recursive route for Y.Y.32.0/19 29-05-2011 10:57:55 <WARN> Next hop address X.X.X.241 resolvable through recursive route for X.X.X.0/24 29-05-2011 10:57:55 <WARN> Next hop address X.X.X.242 resolvable through recursive route for X.X.X.0/24 These are the subnets of the upstream trans-ip links of it's neigbor router On the second (neighbor) bgp router, noticed only such 15 recursive messages I had those upstream trans-ip interface IP's manually added once to the bird.conf with a "protocol static" definition with a subnet of /32. I thought this might be the problem, and wel, disabled those static trans-ip interface routes, except i forgot one. Noticed a lower CPU afterwards, but problem persisted, and i reverted to 1.2.4. Later i noticed i missed one static route to disable, but no time left to upgrade and test again. I think i should have looked at the recursive routes in bird, but i didn't. Does one know what was going on here, and what to do to prevent it when executing another upgrade? I created a 10.000 packet tcpdump capture (full size) of an iBGP session, in case somone would like to look at it. Regards, Arjan Filius -- Arjan Filius mailto:iafilius@xs4all.nl

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Route aggregation in BIRD - how?
by Maciej Wierzbicki 20 Aug '12

20 Aug '12

Hello. Case study: * importing full BGP table from various uplinks * some routes received by BGP are being exported via OSPF to core1, using filters: (source = RTS_BGP && bgp_path ~ [= * ASNXYZ * =]) Question: how to aggregate routes (whenever possible) before exporting them via OSPF to core? Example: lets say that I've received a.b.c.d/22 and a.b.c.d/24 from asnXYZ via BGP. Lets say that I want to export routes with asnXYZ in aspath via ospf to core1 switch. Obviously, a.b.c.d/24 is in a.b.c.d/22, so I would like to export only a.b.c.d/22. Is it doable in bird? If yes, any hint/keywords in doc? -- * Maciej Wierzbicki * At paranoia's poison door * * VOO1-RIPE *

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Re: Route aggregation in BIRD - how?
by Ondrej Zajicek 14 Aug '12

14 Aug '12

On Thu, Feb 23, 2012 at 01:13:16AM +0000, Alexander V. Chernikov wrote: > On 24.01.2012 22:12, Alexander V. Chernikov wrote: >> Ondrej Zajicek wrote: >>> On Mon, Jan 23, 2012 at 10:30:48PM +0400, Alexander V. Chernikov wrote: >>>> On 23.01.2012 22:00, Ondrej Zajicek wrote: >>>>> On Mon, Jan 23, 2012 at 08:14:28PM +0400, Alexander V. Chernikov wrote: >>>>>> On 23.01.2012 20:01, Maciej Wierzbicki wrote: >>>>>>> Hello. > > Hello. > Long story short, beta for aggregation protocol is attached. Thanks, i will look at it. -- 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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OSPF Fast Hello
by Javier Lorenzo Prieto 28 Jun '12

28 Jun '12

We are using BIRD to configure load balancing and redundancy between two sites. These sites are interconnected via two short-range RF links (each with 15 Mpbs effective throughput and delay of 5ms). Because we intend to send VoIP over these links and would like to avoid dropping calls in the event of interruptions in one of the links. Therefore, dynamic routes need to be updated very quickly. --------- SITE 1 -- R1 R2 -- SITE 2 --------- Does BIRD allow setting the parameters as follows? • dead 2 • hello 1 protocol ospf { import all; ecmp on; area 0.0.0.0 { interface "vlan200", "vlan201" { cost 5; check link on; type broadcast; hello 1; retransmit 4; wait 1; dead 2; authentication none; }; }; } When we try this configuration, our routers never reach the point of creating adjacency. However, everything works OK when setting dead=3 and hello=1. Furthermore the parameters dead=2 and hello=1 do work when using QUAGGA. Am I missing anything? Thanks in advance for your help!

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Soft routes in bird
by Amadeus 26 May '12

26 May '12

Hi, is it possible to configure bird in a way that it stops advertising route A as soon as it recognizes that the same route A is now advertised by another router? So to speak, make it 'respectful' to the advertisements of others - despite the fact that it has entries of type 'static' matching A? Best wishes, Amadeus

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Auto generate prefix-list
by Denis Samsonov 22 May '12

22 May '12

Dear Colleagues, sorry for offtop. Who makescript to automatically generationa bird prefix-list by AS-SET from RIPE-DB? Can you show examples?

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real broadcast mode
by Tapio Haapala 16 May '12

16 May '12

Hello, Bird supports with ospf type broadcast. Looks that it actually means hat you execpt from "type mcast". On several networks multicast is broken. Yes it is broken and we cannot do nothing for that because they are metro ethernet and odsl (operator dsl) networks and they are leased from local operators. One solution is make mtmp configuration but if you have 100 router it is nightmare. So I humbly asking new feature. It is real broadcast type. Because of compatibility reasons it is unpossible use type bcast for that and rename multicast for type mcast I suggest that new type is rbcast. It is extension over rfc but it is really usefull one. On real broadcast packets send to 255.255.255.255 so they does not get meshed up with multicast specific rules. I have hear many times "but multicast is broadcast on l2 networks". Pleas dont use that argument. Truck is car, pickup is car but it does not mean that truck is pickup. Some times you have roads where you can drive with pickups but not with trucks. First time when I face this problem I was thiking that "ok this is corner case and solution is ptmp". When we start get these cases on several networks with several operators and several vendors, I start thinking that maybe there is improvement need on ospf. ps How many elese had suffer problems with metro ethernet or dsl network that devices delivery unicast traffic and bcast traffic to ff:ff:ff:ff:ff:ff but does not delivery traffic to 01:00:5e:00:00:05 -- F-Solutions Oy Tapio Haapala PL 7, 90571 Oulu GSM 040-0998371 Skype burner- IRC Burner@ircnet

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Bird build on embedded system
by Bill Siadak (bsiadak) 15 May '12

15 May '12

Hello, Bird maintainers. I am having an issue when cross-compiling bird for an embedded system. The build fails due to an issue in the install where there appears to not be an option in the configure to specify a non-native strip utility to the install utility. Please provide a configure option that allows specification of a ""--strip-program=<program>" to the Makefile or remove the -s from the make install and let the strip be done later as a separate step. Thanks, Bill

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Possible bug in ospf_lsupd_receive
by Benjamin Paterson 14 May '12

14 May '12

Hi guys, I think there's an endianness problem in ospf_lsupd_receive. On the lines where the program checks lsa->type or uses the LSA_SCOPE macro, it has not previously converted lsa->type to host representation. I saw this problem as I created a new LSA class with type BFF0, which has area scope. It was incorrectly displaying "<WARN> Received LSA with invalid scope" messages and refusing to add the LSAs to the database. I checked and at the line 513, if ((LSA_SCOPE(lsa) == LSA_SCOPE_RES)) was evaluating as true because lsa->type was F0BF, which is a reserved type. All the other LSA types are also inverted, but it doesn't pose a problem for the common LSA types as their first hex digit is usually 0 if they are misrepresented (0800 for link LSA, 0120 for router LSA etc). The problem can be fixed by putting ntohlsah(lsa, &lsatmp); before the checks and using &lsatmp instead of lsa for checks. Cheers

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Interface Instance IDs in OSPFv3
by Benjamin Paterson 14 May '12

14 May '12

I am intrigued by the following bit of code in BIRD 1.3.7 proto/ospf/iface.c void ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a) { [...] if (flags & IF_CHANGE_UP) { int done0 = 0; struct ospf_area *oa; WALK_LIST(oa, po->area_list) { int iid = 0; struct ospf_iface_patt *ip; while (ip = ospf_iface_patt_find(oa->ac, a->iface, iid)) { ospf_iface_new(oa, a, ip); if (ip->instance_id == 0) done0++; iid = ip->instance_id + 1; } } I might be wrong here, but if I understand correctly, the code expects the set of instance IDs configured on each interface to be of the form [| 0, n |]. In addition, I haven't seen any option to manually set Instance IDs. Is there any reason why this should be the case? I would like to manually set the instance ID to something other than 0, without necessarily having other protocol instances running on the same interface. Thanks - Benjamin

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