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BIRD BGP and VRF - Cannot assign requested address
by Clément Guivy 08 Aug '17

08 Aug '17

Hello, I am trying to set up 2 BIRD routers as AS border routers (on Debian 9). Installation is as follows : |BIRD router 1|-----IBGP-----|BIRD router 2| | | EBGP EBGP | | |Hardware router 1|---IBGP---|Hardware router 2| | (downstream) | | (downstream) | (later the BIRD routers would also be connected to our upstreams ISPs, but for the sake of simplicity let's just consider this part of the setup) I plan to use both ipv4 and ipv6 and also, on BIRD routers both the forwarding and the BGP peerings are to take place in a linux vrf named "internet" (using l3mdev, not namespaces or custom ip rules). At the BIRD level I also set up a table named "internet". Now, to my problem : the EBGP peerings with the downstreams routers are UP, but on the other hand the IBGP between the two BIRD routers won't come up, I get the following error messages : On ipv4 peering, the service complains that : ibgp_internet: Socket error: bind: Cannot assign requested address On ipv6 peering : the service won't complain but using birdc6 I can see that the protocol says : Socket: Network is unreachable Both routers have almost identical config (apart from the IP addresses of course), here is the conf on BIRD router 1 : ------------------------------------------------------ ---------------------bird.conf------------------------ ------------------------------------------------------ table internet; router id 10.206.81.36; define my_as=205555; protocol device { } protocol kernel { kernel table 10; table internet; metric 64; import all; export all; scan time 10; } protocol static default_route_to_bgp { import all; table internet; route 0.0.0.0/0 reject; } template bgp template_base_bgp { med metric; } protocol bgp ibgp_internet from template_base_bgp { table internet; source address 10.206.81.81; local as my_as; neighbor 10.206.81.82 as my_as; import all; export all; next hop self; } protocol bgp downstream_internet from template_base_bgp { table internet; export where proto = "default_route_to_bgp"; source address 10.206.81.90; local as my_as; neighbor 10.206.81.89 as 65206; } ------------------------------------------------------ ------------------end of bird.conf-------------------- ------------------------------------------------------ ------------------------------------------------------ ---------------------bird6.conf----------------------- ------------------------------------------------------ table internet; router id 10.206.81.36; define my_as=205555; protocol device { } protocol kernel { kernel table 10; table internet; metric 64; import all; export all; scan time 10; } template bgp template_base_bgp { med metric; } protocol bgp ibgp_internet from template_base_bgp { table internet; source address 2a0b:95c0:0000:0101::1; local as my_as; neighbor 2a0b:95c0:0000:0101::2 as my_as; import all; export all; next hop self; } protocol static default_route_to_bgp { import all; table internet; route ::/0 reject; } protocol bgp downstream_internet from template_base_bgp { table internet; export where proto = "default_route_to_bgp"; source address 2a0b:95c0:0000:0102::2; local as my_as; neighbor 2a0b:95c0:0000:0102::1 as 65206; } ------------------------------------------------------ -----------------end of bird6.conf-------------------- ------------------------------------------------------ The network interfaces seems to be properly UP and attached to the internet VRF, here is the IBGP one : # ip addr show eth1.3 7: eth1.3@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master internet state UP group default qlen 1000 link/ether 94:18:82:ab:8b:ec brd ff:ff:ff:ff:ff:ff inet 10.206.81.81/29 brd 10.206.81.87 scope global eth1.3 valid_lft forever preferred_lft forever inet6 2a0b:95c0:0:101::1/64 scope global valid_lft forever preferred_lft forever inet6 fe80::9618:82ff:feab:8bec/64 scope link valid_lft forever preferred_lft forever and here is the EBGP one (the one which has the functional peering) : # ip addr show ens1.14 8: ens1.14@ens1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master internet state UP group default qlen 1000 link/ether 9c:dc:71:45:5f:e0 brd ff:ff:ff:ff:ff:ff inet 10.206.81.90/29 brd 10.206.81.95 scope global ens1.14 valid_lft forever preferred_lft forever inet6 2a0b:95c0:0:102::2/64 scope global valid_lft forever preferred_lft forever inet6 fe80::9edc:71ff:fe45:5fe0/64 scope link valid_lft forever preferred_lft forever Now the "internet" kernel routing table, we can see that the local and broadcast routes are attached to it too : # ip route show table internet unreachable default proto bird metric 64 broadcast 10.206.81.80 dev eth1.3 proto kernel scope link src 10.206.81.81 10.206.81.80/29 dev eth1.3 proto kernel scope link src 10.206.81.81 local 10.206.81.81 dev eth1.3 proto kernel scope host src 10.206.81.81 broadcast 10.206.81.87 dev eth1.3 proto kernel scope link src 10.206.81.81 broadcast 10.206.81.88 dev ens1.14 proto kernel scope link src 10.206.81.90 10.206.81.88/29 dev ens1.14 proto kernel scope link src 10.206.81.90 local 10.206.81.90 dev ens1.14 proto kernel scope host src 10.206.81.90 broadcast 10.206.81.95 dev ens1.14 proto kernel scope link src 10.206.81.90 Finally, netstat shows that the BGP service is listening on * as it is supposed to. We also see the established EBGP downstream sessions : # netstat -an | grep 179 tcp 0 0 0.0.0.0:179 0.0.0.0:* LISTEN tcp 0 0 10.206.81.90:179 10.206.81.89:9266 ESTABLISHED tcp6 0 0 :::179 :::* LISTEN tcp6 0 0 2a0b:95c0:0:102::2:179 2a0b:95c0:0:102:::64247 ESTABLISHED and tcp_l3mdev_accept is enabled in the kernel config : # sysctl net.ipv4.tcp_l3mdev_accept net.ipv4.tcp_l3mdev_accept = 1 So overall it seems like BIRD fails to bind to one interface, this is possibly linked to the kernel VRF setup but I can't see why it doesn't work when the peering to downstream routers using the same VRF do work properly. Any help would be greatly appreciated. Thanks. clément

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Hold time expired error
by Ajai Kumar 06 Aug '17

06 Aug '17

Dear All, We are facing problem with few peers in our IX. Frequently they get Hold Timer Expired Error and they are not able to ping our route server IP. After shut no shut this problem resolves for sometime. One log message appended bgp_hold_timeout:4690: NOTIFICATION sent to X.X.X.X (External AS 132953): code 4 (Hold Timer Expired Error), Reason: holdtime expired for X.X.X.X (External AS 132953), socket buffer sndcc: 57 rcvcc: 0 TCP state: 4, snd_una: 728368567 snd_nxt: 728368624 snd_wnd: 15744 rcv_nxt: 429172199 rcv_adv: 429188583, hold timer out 90s, hold timer remain 0s Requesting for help pls. Regards, Ajai Kumar -- (M) +91-9868477444 Skype ID:erajay P-mail: joinajay1 at gmail.com ................................. Please don't print this email unless you really need to. This will preserve trees on our planet.

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Unable to connect to server control socket (/run/bird/bird.ctl): No such file or directory
by Janvier Rwakagabo 05 Aug '17

05 Aug '17

Hi all Need your help, I have installed properly bird, Edit bird.conf file with my configuration, then when I restart the service bird it give this error #/etc/init.d/bird restart stop: Unknown instance: start: Job failed to start by typing #birdc it give below error #birdc Unable to connect to server control socket (/run/bird/bird.ctl): No such file or directory I checked under /run/bird/ folder there is no bird.ctl only bird6.ctl is present I deleted bird.conf and restaured default bird.conf the issue was solved, by editing again bird.conf and restarting the service, bird.ctl is droped again. Can anyone assist me to solve this issue. Thanks, Regards, Janvier R.

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Read-only access
by Łukasz Trąbiński 03 Aug '17

03 Aug '17

Hi It’s possible to do read only access via birdc? I know that I can setup LG but question is about command line (birdc, birdctl)? Thnx

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You have plans to add to the bird native support for working with the VPP fib.
by Гришин В.С. 02 Aug '17

02 Aug '17

Hi, You have plans to add to the bird native support for working with the VPP fib. References for understanding the my question. https://wiki.fd.io/view/VPP/Features https://github.com/FRRouting/frr/wiki/Alternate-forwarding-planes:-VPP --- This link contains a description of the very curve way to support VPP fib by linux daemons. https://docs.fd.io/vpp/17.07/release_notes_1707.html Regards, Vladislav

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BGP Conditional Advertisement
by e2rd 02 Aug '17

02 Aug '17

Hi, Is there any way to configure BGP Conditional Advertisement like in cisco: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16… ? -- Łukasz

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Why is a neighbour as ospf peer reachable, but as router unreachable?
by Roger Schreiter 01 Aug '17

01 Aug '17

Hello, is there something special to configure, for bird ospf knowns, which IP addresses belong to the one neighbour router? I have bird in ospf area 2. The ospf peer is in area 2 and in area 0. bird ospf learns all prefixes and routes from that peer and shows them in its lsadb. However, it copies no routes to the kernel routing table. I assume, bird does not understand, that this peer is the gateway. Can someone please have a look at the "topology" output and give me a hint about the "unreachable" notices! 93.189.172.3 is the ospf id of the peer, according to its IP address in area 0. 93.189.172.85 is birds IP address. The peer has .86 in that network. Regards, Roger. bird> show ospf topology all area 0.0.0.2 router 93.189.172.3 unreachable network 93.189.172.84/30 metric 10 router 93.189.172.85 distance 0 router 93.189.172.3 metric 10 network 93.189.172.84/30 dr 93.189.172.3 unreachable router 93.189.172.85 router 93.189.172.3

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OSPF no route
by Михаил Хотько 01 Aug '17

01 Aug '17

Hi! I have some trouble with OSPF: Switch1 and Switch2 has BIRD on them. The connections are like that: <Switch1> gi 0/1 -- gi 0/1 <Cisco> gi 0/2 -- gi 0/1 <Switch2> Switch1 has: - VLAN1 with IP 192.168.0.1/30 - interface Gi0/1 in access mode and VLAN1 - OSPF router with network 192.168.0.0/30 area 0. Switch2 has: - VLAN2 with IP 172.16.0.1/24 - interface Gi0/1 in access mode and VLAN2 - OSPF router with network 172.16.0.0/24 area 10. Cisco Switch has: - VLAN1 with IP 192.168.0.2/30 - VLAN2 with IP 172.16.0.2/24 - interface Gi0/1 in access mode and VLAN1 - interface Gi0/2 in access mode and VLAN2 - OSPF router with 2 networks: 192.168.0.0/30 area 0 - and 172.16.0.0/24 area 10. The trouble is that Switch1 has not receive route to Switch2, if prefix length of IP on VLAN1 is 30. If prefix length is 29 or less everything is OK. Regards, Mikhail Khotko С уважением, Михаил Хотько

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show route
by Luk 01 Aug '17

01 Aug '17

Hi, What is proper syntax for this kind of show route: bird> show route protocol ECO where net ~ 2.2.2.250/31 all 2.2.2.250/31 via 1.1.1.66 on eth0.930 [ECO 08:53:25] * E2 (150/200/10000) [1.1.1.66] Type: OSPF-E2 unicast univ OSPF.metric1: 200 OSPF.metric2: 10000 OSPF.tag: 0x00000000 OSPF.router_id: 1.1.1.66 bird> show route protocol ECO where ospf_router_id ~ 1.1.1.66 bird> I expect, that second show route should show the same output as first. -- Regards, Luk

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Syntax error at "export all;"
by Roger Schreiter 29 Jul '17

29 Jul '17

Hello, I just started configuring my first installation of bird. However, I even do not get running the simples samples. My conf file protocol kernel { export all; } does fail. Bird complains "syntax error" (indicating the line number with "export all".) If I comment out that line, bird complains "Channel not specified" (indicating the line with the closing }.) I wonder, if protocol "kernel" is known by my bird installation. When "configure" had run, it showed a lot of protocols, but "kernel". Maybe "kernel" is included anyway. Any hints for me? Roger.

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