June 2014 - Bird-users - Mailing Lists

New in BIRD
by Ilias Pallikarakis 23 Aug '16

23 Aug '16

Hi, I recently started trying to learn BIRD. I should also mention I have no previous experience with any other Routing daemon either. I want to configure a bgp monitor for both ipv4 and ipv6. I am running BIRD in a Ubuntu 13.10 VM. I managed to install both bird and bird6 but I have some problems with the configurations. In ipv4 : I created a very simple configuration which I attach. The conf is compiled but in birdc the bgp session is considered idle. I tried to do a tcpdump and found that the router sends a TCP SYN on the VM's bgp port but the VM responds with a RST and never tries to set a BGP session itself. In ipv6 : No matter the configuration (my configuration or the sample coming with bird6 or examples found on the web) the configuration is not compiled giving the following error : BIRD ipv6 doesn't run (bird: /usr/local/etc/bird6.conf, line 1: Router ID must be configured manually on IPv6 routers) Could anyone give me some pointers on what I am doing wrong ? Thank you for your help, Ilias Pallikarakis

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IS-IS
by kveri new 01 Jun '15

01 Jun '15

Hello, I would like to implement IS-IS as a part of my master thesis. Are there any apparent problems which would prevent successful implementation, political and/or technical? Also I would like to hear opinions of the authors. Implementation timeframe is 2013 (if we live past 21th). Regards, Martin Čechvala Faculty of Informatics and Information Technologies Slovak Technical University

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RIP not doing "triggered update" following route deletion
by Tore Anderson 15 Oct '14

15 Oct '14

I've noticed that BIRD doesn't withdraw (i.e., advertising them with metric 16) RIP routes when they disappear from the routing table. This means that the neighbour router ends up waiting for the route to time out before ceasing to send traffic to the BIRD router, rather than doing so immediately. I'm running v1.4.0 with a bird.conf containing: log syslog { info, remote, warning, error, auth, fatal }; router id 192.0.2.1; protocol device {} protocol direct {} protocol rip { interface "*" { mode nolisten; ttl security on; }; import none; export all; } To reproduce the issue, look at "tcpdump -v port 520" while doing: 1) ip address add 192.0.2.2/32 dev lo -> a triggered update appears (advertising 192.0.2.2/32) 2) ip address delete 192.0.2.2/32 dev lo -> a triggered update doesn't appear (it should have) For what it's worth, step #2 does increase the RIP protocol's "Export withdraws" counter. This issue also applies to RIPng/bird6. AFAICT, not sending these triggered updates immediately is a standards violation. Quoting RFC 1812 F.2: «A router MUST send a triggered update when routes are deleted or their metrics are increased.» Also see RFC 2453 section 3.10.1. Tore

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BFD implementation in 1.4.0
by Aleksey Berezin 02 Sep '14

02 Sep '14

Hi there! Firstly, sorry for my French ;) Recently I tried to test BFD implementation in 1.4.0 BIRD release. Case is "OSPF ECMP with less-second failover". On one side - Extreme Networks switches, other side - several boxes with Debian and BIRD, of course. So, I find out several annoying things. First thing: BIRD BFD implementation uses non-RFC5881 source UDP port for outgoing packets. Here some tcpdump: =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 20:34:21.355747 <BIRD_BOX_MAC> > <EXTREME_SW_MAC>, ethertype 802.1Q (0x8100), length 70: vlan <vlan>, p 0, ethertype IPv4, (tos 0xc0, ttl 255, id 20806, offset 0, flags [none], proto UDP (17), length 52) <BIRD_BOX_IP>.39156 > <EXTREME_SW_IP>.3784: BFDv1, length: 24 Control, State Init, Flags: [none], Diagnostic: No Diagnostic (0x00) Detection Timer Multiplier: 5 (5000 ms Detection time), BFD Length: 24 My Discriminator: 0x8a82eb8a, Your Discriminator: 0x00000002 Desired min Tx Interval: 1000 ms Required min Rx Interval: 10 ms Required min Echo Interval: 0 ms =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= I saw many messages in switch logs: > <Warn:BFD.RxPktInv> Received BFD an invalid packet on VLAN <vlan> Error:Invalid UDP src port Number BFD session between BIRD and Extreme Networks switch can't be established. So, src port for outgoing BFD-packet from BIRD is 39156, when RFC5881 contains: =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 4. Encapsulation BFD Control packets MUST be transmitted in UDP packets with destination port 3784, within an IPv4 or IPv6 packet. The source port MUST be in the range 49152 through 65535. =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ok, fixing (only for test purposes): =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= root@debian-1:~# sysctl net.ipv4.ip_local_port_range net.ipv4.ip_local_port_range = 32768 61000 root@debian-1:~# sysctl -w net.ipv4.ip_local_port_range="49152 65535" net.ipv4.ip_local_port_range = 49152 65535 root@debian-1:~# sysctl net.ipv4.ip_local_port_range net.ipv4.ip_local_port_range = 49152 65535 =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= After this BFD session was estabilished. Of course, net.ipv4.ip_local_port_range tuning seems to be not usable in production environment, and need to be fixed in BIRD, I think. Just because some network hardware vendors interprets RFC's exactly as written ;) But now - second thing: 'protocol bfd' block in bird.conf useless. Here part of config: =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= protocol bfd FOR_OSPF { interface <BIRD_BOX_IP>/32 { interval 50 ms; min rx interval 50 ms; # presence of this string by the docs does not matter min tx interval 50 ms; # presence of this string by the docs does not matter multiplier 3; }; neighbor <EXTREME_SW_IP> dev "<BIRD_BOX_IP>" local <BIRD_BOX_IP>; # presence of this string by the docs does not matter }; protocol ospf OSPF1 { ... area 0.0.0.0 { interface <BIRD_BOX_IP>/32 { ... bfd; }; }; ... }; =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= And what I see with tcpdump: =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 13:09:05.433336 <BIRD_BOX_MAC> > <EXTREME_SW_MAC>, ethertype 802.1Q (0x8100), length 70: vlan <vlan>, p 0, ethertype IPv4, (tos 0xc0, ttl 255, id 6662, offset 0, flags [none], proto UDP (17), length 52) <BIRD_BOX_IP>.62698 > <EXTREME_SW_IP>.3784: BFDv1, length: 24 Control, State Up, Flags: [none], Diagnostic: No Diagnostic (0x00) Detection Timer Multiplier: 5 (500 ms Detection time), BFD Length: 24 My Discriminator: 0x35e75227, Your Discriminator: 0x00000007 Desired min Tx Interval: 100 ms Required min Rx Interval: 10 ms Required min Echo Interval: 0 ms =-=-=--=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= There is no any configured intervals and multiplier. Just default values. I think this is not correct. Maybe I misconfigure BIRD? Please advise. Thanks for attention.

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Strange entries in OSPF LSADB
by 1 Игорь 11 Jul '14

11 Jul '14

Hi! I'm use OSPF network statement networks { 10.32.0.0/12; } And when I look at show ospf lsadb I see entry 0003 10.47.255.255 10.0.0.0 237 80000001 809e I discover, that for some networks LSADB entries looks strange: In bird.conf: networks { 10.32.0.0/12; 10.48.0.0/12; 10.64.0.0/12; 10.80.0.0/12; 10.96.0.0/12; 10.112.0.0/12; 10.128.0.0/12; 10.144.0.0/12; 10.160.0.0/12; 10.176.0.0/12; 10.192.0.0/12; 10.208.0.0/12; 10.224.0.0/12; 10.240.0.0/12; }; bird> show ospf lsadb 0001 10.0.0.0 10.0.0.0 174 8000011b 43b4 0003 10.47.255.255 10.0.0.0 237 80000001 809e 0003 10.48.0.0 10.0.0.0 68 80000001 74a9 0003 10.79.255.255 10.0.0.0 62 80000001 feff 0003 10.80.0.0 10.0.0.0 62 80000001 f20b 0003 10.111.255.255 10.0.0.0 56 80000001 7d61 0003 10.112.0.0 10.0.0.0 50 80000001 716c 0003 10.143.255.255 10.0.0.0 44 80000001 fbc2 0003 10.144.0.0 10.0.0.0 44 80000001 efcd 0003 10.175.255.255 10.0.0.0 38 80000001 7a24 0003 10.176.0.0 10.0.0.0 32 80000001 6e2f 0003 10.207.255.255 10.0.0.0 26 80000001 f885 0003 10.208.0.0 10.0.0.0 20 80000001 ec90 0003 10.239.255.255 10.0.0.0 20 80000001 77e6 0003 10.240.0.0 10.0.0.0 14 80000001 6bf1 Is it normal?

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Infer BGP 'source address' value dynamically
by Eric Cables 09 Jul '14

09 Jul '14

I was hoping someone could assist with defining a local constant for a BGP 'source address' through dynamic means. An example would be 'router id from' where a mask and prefix can be identified to inherit the router ID. router id from "lo*" 192.168.0.0/24; saddr = <whatever router id inherited> I was hoping that router id would be an internal symbol, but I don't see it in the 'show symbols ...' output. Any thoughts? The goal is to make this configuration as dynamic as possible, so that it can be deployed to a number of systems without manual changes on each. -- Eric Cables

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incorrect memory usage reporting
by Job Snijders 29 Jun '14

29 Jun '14

Hi all, I use a BIRD instance for route collection from ~ 50 full bgp feeds [1]. The 'show mem' command reports very ambitious results: job@lg01:~$ sudo birdc show mem BIRD 1.4.2 ready. BIRD memory usage Routing tables: 4294967294 GB Route attributes: 1540 MB ROA tables: 192 B Protocols: 311 kB Total: 0 GB job@lg01:~$ free -m total used free shared buffers cached Mem: 8759 4944 3815 0 187 366 -/+ buffers/cache: 4390 4369 Swap: 486 0 486 job@lg01:~$ Might there be a counter that wraps around? How can I help debug this? Kind regards, Job [1]: http://lg.ring.nlnog.net/summary/lg01/ipv4

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Dynamic routes from OSPF disappear
by Gregor Kališnik 26 Jun '14

26 Jun '14

Hi. We have two routers and 7 machines with bird installed (7 machines <-> router <- Internet -> router <-> 8th machine) that work without problems. When I've added 8th machine with Ubuntu 14.04 and bird 1.4.3, everything was working for about one hour after all routes announced over OSPF disappeared, also own routes were not announced. By enabling debugging (debug ospf1 all in birdc) there are no messages that would indicate an error (just normal hello exchange and OSPF LSA announcements). By restarting the ospf1 protocol, the OSPF routes are exchanged and it works for another hour or so. Anybody experienced the same behavior? Best regards, Gregor Kališnik

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Unnumbered interfaces and OSPF
by Vincent Bernat 26 Jun '14

26 Jun '14

Hi! I am trying to use unnumbered interfaces and OSPF. On one router: ip addr add 10.90.255.3/32 dev eth0 ip addr add 10.90.255.3/32 dev eth1 On the other: ip addr add 10.90.255.4/32 dev eth0 ip addr add 10.90.255.4/32 dev eth1 On both of them: protocol ospf INTERNAL { import all; export none; area 0.0.0.0 { networks { 10.90.255.3/32; 10.90.255.4/32; }; interface "eth0" { bfd yes; type ptp; }; interface "eth1" { bfd yes; type ptp; }; }; ecmp yes; } But: bird> show ospf INTERNAL: RFC1583 compatibility: disabled Stub router: No RT scheduler tick: 1 Number of areas: 1 Number of LSAs in DB: 2 Area: 0.0.0.0 (0) [BACKBONE] Stub: No NSSA: No Transit: No Number of interfaces: 2 Number of neighbors: 0 Number of adjacent neighbors: 0 Area networks: 10.90.255.4/32 Advertise Active 10.90.255.3/32 Advertise Active bird> show ospf interface INTERNAL: Interface eth0 (10.90.255.3/32) Type: ptp Area: 0.0.0.0 (0) State: ptp (stub) Priority: 1 Cost: 10 ECMP weight: 1 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 Interface eth1 (10.90.255.3/32) Type: ptp Area: 0.0.0.0 (0) State: ptp (stub) Priority: 1 Cost: 10 ECMP weight: 1 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 tcpdump shows me that no hello packets are tentatively transmitted. Why is the state of each interface marked as "stub"? I would expect each OSPF router to be able to discover itself through the PtP link. -- printk("What? oldfid != cii->c_fid. Call 911.\n"); 2.4.3 linux/fs/coda/cnode.c

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ipv4 inside ipv6 for ospf
by Vasiliy Tolstov 25 Jun '14

25 Jun '14

Hi. Does bird supports http://tools.ietf.org/html/draft-ietf-ospf-ipv4-embedded-ipv6-routing-14 ? If yes, how can i configure it? -- Vasiliy Tolstov,

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