- Bird-users - Mailing Lists

BIRD removing BGP routes from other daemon - FreeBSD
by Cassiano Peixoto 03 Jul '15

03 Jul '15

Hello, I have a particular scenario where my BGP runs with OpenBGP and I can not change it right now. However I want BIRD to use OSPF and BFD. While BIRD works perfectly, better than OpenOSPF for my scenario, when I start it, it completely removes all routes installed by OpenBGP. My kernel context has learn, persist and import: protocol kernel { learn; persist; scan time 10; import all; #export all; graceful restart on; } What should I do to keep BIRD co-operating with other routing daemons? Thank you.

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Bird 1.4.5 add-path crash
by Martin Pels 02 Jul '15

02 Jul '15

Hello, I'm seeing Bird 1.4.5 crash with a segmentation fault when receiving routes from a peer with add-path enabled. BIRD config: protocol bgp { direct; description "Juniper"; local as 65065; neighbor a:b:c:a as 65065; add paths rx; gateway direct; import none; export none; } The other side is a Juniper BGP speaker (JunOS 12.3R7), with the following config: neighbor a:b:c:d { family inet6 { unicast { add-path { send { path-count 2; } } } } peer-as 65065; } Session establishment completes, but when the Juniper sends routes Bird crashes. I can provide a core dump and pcap trace if needed. Kind regards, Martin Pels CDN Network Engineer LeaseWeb Technologies B.V. T: +31 20 316 0232 M: E: m.pels(a)tech.leaseweb.com W: http://www.leaseweb.com Luttenbergweg 8, 1101 EC Amsterdam, Netherlands

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bird becoming unresponsive after a few hours
by Darren O'Connor 29 Jun '15

29 Jun '15

Hi. I run bird 1.3.7 on a Debian VPS which peers with three IPv4 peers and three IPv6 peers. I have no data plane traffic, as I use these peers to run these two twitter accounts: https://twitter.com/bgp4_table https://twitter.com/bgp6_table I needed more peers, so I moved to a new VPS with 2GB ram. The previous only had 1GB. I have have 7 global IPv4 peers and 7 IPv6 peers. I'm running bird 1.4.0 on Ubuntu 14.04 - I've noticed that if I leave it for about an hour, and then log into birdc and type 'show route count' - bird will stall for about a minute giving no response. At that time, if I check netstat my Recv-Q rapidly increases on all my BGP sessions. Now and then my BGP peers will also go down stating hold time expired. When I check at random times my Recv-Q is high on these sessions. My older server with three peers has never had this issue. Unfortunately bird's log is not showing anything. It only shows when a peer goes down due to the hold time expired. Any ideas on what I can check? Thanks Darren

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Bird 1.5.0: protocol 'direct' looses routes
by Andrew 18 Jun '15

18 Jun '15

Hi all. I'm testing bird 1.5.0 on PPPoE BRAS, and today noticed that sometimes it looses routes. For ex., today it looses near 5 networks of 103 total (before restart - it has 98 routes, after - 103) Possibly this may be related with tunnel session hangup - when user reconnects with same IP and then old session is dropped, bird may loose this route while route is present in system. But I'm not sure about this.

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Support for BGP Flow Spec / RFC 5575
by Pavel Odintsov 12 Jun '15

12 Jun '15

Hello, Bird team! Do you have any plans about BGP Flow Spec (RFC 5575) implementation? It's very important protocol for traffic filtering and DDoS mitigation and it's must for modern route servers. Cisco and Juniper have complete support for it but in open source routing side there are no news on this field :( Fortunately, we have ExaBGP which could generate flow spec announces automatically. And Bird could add partial support for route reflection for flow spec NLRI and we could use ExaBGP as source for flow spec announces. There are excellent guide about this feature implementation in Cisco: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/… -- Sincerely yours, Pavel Odintsov

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Bird OSPF. Mask for advertised prefixes.
by Пьянков Алексей 11 Jun '15

11 Jun '15

Hello. We have bird 1.4.5 on servers with CentOS 6.5. We use it for advertise loopback sub-interfaces by OSPF. All subifs with /32 mask. We use IPVS+keepalived to bring up and down loopback subifs. Ifconfig: # ifconfig eth0.79 Link encap:Ethernet HWaddr 00:50:56:BA:37:70 inet addr:10.1.79.2 Bcast:10.1.79.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:feba:3770/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:34948906 errors:0 dropped:0 overruns:0 frame:0 TX packets:34154161 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3954197378 (3.6 GiB) TX bytes:3820153316 (3.5 GiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:19544 errors:0 dropped:0 overruns:0 frame:0 TX packets:19544 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:977404 (954.4 KiB) TX bytes:977404 (954.4 KiB) lo:34 Link encap:Local Loopback inet addr:10.9.200.100 Mask:255.255.255.255 UP LOOPBACK RUNNING MTU:65536 Metric:1 OSPF works on eth0.79 interface. Problem - when IPVS+keepalived brings up any loopback subif - Bird additionally accept same network but with /8 mask and advertise it to the network. >From Bird log: Jun 11 10:36:23 bird: net accepted:10.0.0.0/8 2015-06-11 10:36:22 <INFO> net accepted:10.9.200.100/32 So in network I see: 10.0.0.0/8, ubest/mbest: 1/0 *via 10.1.79.2, Vlan79, [110/10], 00:02:06, ospf-0, type-2 and 10.9.200.100/32, ubest/mbest: 1/0 *via 10.1.79.2, Vlan79, [110/10], 02:12:08, ospf-0, type-2 Filter for the Bird to advertise loopbacks: protocol direct { interface "lo*"; # Restrict network interfaces it works with } filter connected_OSPF { # redistribute connected if ( source = RTS_DEVICE ) then { print "net accepted:", net; ospf_metric2 = 10; accept; } } As workaround we configure another filter that accept only /32 nets: filter connected_OSPF # redistribute connected prefix set DEVICE_NETWORKS; { DEVICE_NETWORKS = [ 0.0.0.0/0{32,32} ]; if ( source = RTS_DEVICE && net ~ DEVICE_NETWORKS ) then { print "net accepted:", net; ospf_metric2 = 10; accept; } reject; } Is it expected behavior of Bird to advertise prefixes like this or I missed something? Alexey

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How to export prefixes configured on loopback via OSPF
by Madhuri 11 Jun '15

11 Jun '15

Hi, How to export prefixes configured on loobback interfaces through OSPF. working fine with BGP. following is the configuration that I have tried. But 192.168.1x.1 are not shown in neighbor's route table. Thanks in advance. *ifconfig output :* lo:11 Link encap:Local Loopback inet addr:192.168.11.1 Mask:255.255.255.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 lo:12 Link encap:Local Loopback inet addr:192.168.12.1 Mask:255.255.255.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 *bird.conf* router id 1.1.1.1; protocol direct { interface "eth1","eth2","lo*"; } protocol kernel { persist; scan time 20; export all; } protocol device { scan time 10; } protocol ospf R1 { tick 2; rfc1583compat yes; area 0.0.0.0 { stub no; interface "eth1","eth2" { hello 9; retransmit 6; cost 10; transmit delay 5; dead count 5; wait 50; type broadcast; authentication simple; password "admin"; }; }; } Thanks, Madhuri

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BGP multipath support
by Alexander Frolkin 08 Jun '15

08 Jun '15

Hello, I was wondering how hard it would be to add BGP multipath support to BIRD, or if anyone was working on it already? I'm not a C guru, but I could maybe have a look at doing this, especially if someone who knows the code could point me in the right direction... :-) Thanks! Alex

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BGP extented communities checks
by Arnaud Fenioux 08 Jun '15

08 Jun '15

Hi folks! I have played with extended communities with some of my peers, and have written this function below to facilitate my checks. On the examples found on github (https://gitlab.labs.nic.cz/labs/bird/wikis/Route_server_with_community_base… and https://gitlab.labs.nic.cz/labs/bird/wikis/Route_server_with_community_base…) I have noticed that RO are used : if (ro,myas,peeras) ~ bgp_ext_community then return true; bgp_ext_community.delete([(ro,0,*)]); But according to my tests, RT should be used. Did anybody made the same ascertainment? ----- ### Chek if the community or ext_community is present function is_community(int left; int right) { if right > 65535 then { #Check of the extended community for 32b ASN if (rt,left,right) ~ bgp_ext_community then return true; } else { #Check of the extended (and not ext) community for 16b ASN if ((left,right) ~ bgp_community) || ((rt,left,right) ~ bgp_ext_community) then return true; } return false; } ---- Cheers, -- Arnaud Fenioux Network Engineer - FranceIX

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OSPFv3 and stub interfaces without lladdr
by Christian Tacke 04 Jun '15

04 Jun '15

Hi, I am trying to get ipv6 routes to openvpn server into ospf. if have an interface "tun*" { stub; }; in my bird6.conf. openvpn does not add link level addrs to its interfaces. That's why ospf ignores this interface. Ignoring it for doing ospf on it is okay, as ospf really wants to run over lladdrs. But do stub networks require a lladdr to be used in ospf? This is at least confusing to me. bird> sh int tun2 up (index=20) PtP Multicast AdminUp LinkUp MTU=1500 fdxx:xxxx:xxxx:4000::1/64 (Primary, scope site) bird> show ospf interface "tun2" ospf1: A workaround is to add fe80::1/64 to tun2 in some "up" script in openvpn, so that bird6 sees the interface. But that does not feel right, really. Cheers Christian -- www.cosmokey.com

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