July 2017 - Bird-users - Mailing Lists

Adding more then one bgp community at once
by Борис Коваленко 05 May '23

05 May '23

Hello! Is this possible to add many communites at once? bgp_community.add([(1,1), (1,2)]) is wrong "Setting clist attribute to non-clist value" Regards, Boris -- С уважением, Борис Коваленко

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manipulating the best path, eBGP, MED?
by Thomas＠PhaseHosting 14 Apr '18

14 Apr '18

Supp, I implemented bird in our Private cloud running proxmox to distribute our public address with eBGP to our serverhost. Through iBGP and a ucarp interface i have a HA gateway, the problem is that our host receives the routes but there are multiple entry points to our subnet ( the proxmox hosts). This makes that a diffrent in & out route doenst work. through following link: https://supportforums.cisco.com/document/126691/understanding-bgp-best-path… I learned that my hosts selects its route based on age ( the bird with the first connection is chosen). Can i send a multi-exit discriminator with my eBGP connection to my host? I googled but could find 2 answers that did't change anything: # your default gateway IP below here protocol bgp eBGP { import none; export where proto = "static_packet"; local as 65000; neighbor 10.80.x.x as 65530; password "SECRET"; #med metric 10; #default bgp_med 10; } (offcourse i tried both without # and waited till export) Or is there an other way to make sure that our host routes always to the first server and so on. -- Thomas Valgaeren thomas(a)phasehosting.io +32477915307

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Decode BGP Shutdown Communication messages (RFC 8203)
by Job Snijders 28 Sep '17

28 Sep '17

Hi all, Here is a patch to decode received BGP shutdown communication messages as specified in RFC 8203. In the following example scenario I'm sending a shutdown communication with openbgpd: $ bgpctl neighbor 94.142.241.204 down "TICKET-2331 we are upgrading, back in 30 min" request processed And can subsequently observe the message via logging and via 'show protocols all': job@irime:~/source/bird$ sudo ./bird -s test.sock -d -c bird2.conf bird: Started bird: bgp1: Received: Administrative shutdown: "TICKET-2331 we are upgrading, back in 30 min" job@irime:~/source/bird$ sudo ./birdc -s test.sock show protocols all .... BGP state: Active Neighbor address: 165.254.255.26 Neighbor AS: 15562 Connect delay: 3/5 Last error: Received: Administrative shutdown Message: "TICKET-2331 we are upgrading, back in 30 min" As for the remaining RFC 8203 work: I could use some help with _sending_ bgp shutdown communication messages. It is not clear to me where I should hook the message into the config/cli infrastructure. Ideally you can do things like: $ birdc disable bgp1 "hi, we will upgrade to bird 1.6.4" or via the configuration (also during reconfigure): protocol bgp { disabled "shutdown due to maintenance ticket 2424"; description "My BGP uplink"; local 94.142.241.204 as 65000; neighbor 165.254.255.26 as 15562; } Thoughts? Kind regards, Job --- proto/bgp/bgp.c | 13 ++++++++++ proto/bgp/bgp.h | 2 ++ proto/bgp/packets.c | 73 ++++++++++++++++++++++++++++++++++------------------- 3 files changed, 62 insertions(+), 26 deletions(-) diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c index f706e76..551b156 100644 --- a/proto/bgp/bgp.c +++ b/proto/bgp/bgp.c @@ -1487,6 +1487,16 @@ bgp_last_errmsg(struct bgp_proto *p) } static const char * +bgp_last_shutmsg(struct bgp_proto *p) +{ + unsigned len; + char *buf = calloc (128, sizeof (char)); + len = p->last_received_shutmsg[0]; + bsnprintf(buf, len, "%s", p->last_received_shutmsg+1); + return(buf); +} + +static const char * bgp_state_dsc(struct bgp_proto *p) { if (p->p.proto_state == PS_DOWN) @@ -1580,7 +1590,10 @@ bgp_show_proto_info(struct proto *P) { const char *err1 = bgp_err_classes[p->last_error_class]; const char *err2 = bgp_last_errmsg(p); + const char *msg = bgp_last_shutmsg(p); cli_msg(-1006, " Last error: %s%s", err1, err2); + if (p->last_received_shutmsg[0] > 0) + cli_msg(-1006, " Message: \"%s\"", msg); } } diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h index e47a0eb..d958716 100644 --- a/proto/bgp/bgp.h +++ b/proto/bgp/bgp.h @@ -157,6 +157,8 @@ struct bgp_proto { u8 last_error_class; /* Error class of last error */ u32 last_error_code; /* Error code of last error. BGP protocol errors are encoded as (bgp_err_code << 16 | bgp_err_subcode) */ + byte last_received_shutmsg[129]; /* RFC 8203 */ + #ifdef IPV6 byte *mp_reach_start, *mp_unreach_start; /* Multiprotocol BGP attribute notes */ unsigned mp_reach_len, mp_unreach_len; diff --git a/proto/bgp/packets.c b/proto/bgp/packets.c index ab87bdc..1a021dd 100644 --- a/proto/bgp/packets.c +++ b/proto/bgp/packets.c @@ -1460,9 +1460,9 @@ static struct { { 5, 3, "Unexpected message in Established state" }, { 6, 0, "Cease" }, /* Subcodes are according to [RFC4486] */ { 6, 1, "Maximum number of prefixes reached" }, - { 6, 2, "Administrative shutdown" }, + { 6, 2, "Administrative shutdown" }, /* RFC 8203 can follow */ { 6, 3, "Peer de-configured" }, - { 6, 4, "Administrative reset" }, + { 6, 4, "Administrative reset" }, /* RFC 8203 can follow */ { 6, 5, "Connection rejected" }, { 6, 6, "Other configuration change" }, { 6, 7, "Connection collision resolution" }, @@ -1497,35 +1497,56 @@ bgp_error_dsc(unsigned code, unsigned subcode) void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsigned subcode, byte *data, unsigned len) { - const byte *name; - byte *t, argbuf[36]; - unsigned i; + const byte *name; + byte *t, argbuf[256]; + unsigned i; + unsigned shutdown_comm_length; - /* Don't report Cease messages generated by myself */ - if (code == 6 && class == BE_BGP_TX) - return; + /* Don't report Cease messages generated by myself */ + if (code == 6 && class == BE_BGP_TX) + return; + + name = bgp_error_dsc(code, subcode); + t = argbuf; + memset(p->last_received_shutmsg, 0, 129); // clear old RFC 8203 messages - name = bgp_error_dsc(code, subcode); - t = argbuf; - if (len) + if (len) { - *t++ = ':'; - *t++ = ' '; + *t++ = ':'; + *t++ = ' '; - if ((code == 2) && (subcode == 2) && ((len == 2) || (len == 4))) - { - /* Bad peer AS - we would like to print the AS */ - t += bsprintf(t, "%d", (len == 2) ? get_u16(data) : get_u32(data)); - goto done; - } - if (len > 16) - len = 16; - for (i=0; i<len; i++) - t += bsprintf(t, "%02x", data[i]); + if ((code == 2) && (subcode == 2) && ((len == 2) || (len == 4))) + { + /* Bad peer AS - we would like to print the AS */ + t += bsprintf(t, "%d", (len == 2) ? get_u16(data) : get_u32(data)); + goto done; + } + /* RFC 8203 */ + if ((code == 6) && ((subcode == 2 || subcode == 4)) && (len <= 129)) + { + shutdown_comm_length = data[0]; + if ((shutdown_comm_length <= 128) && (len == shutdown_comm_length + 1)) + { + t += bsprintf(t, "\""); + for (i=1; i<len; i++) + t += bsprintf(t, "%c", data[i]); + t += bsprintf(t, "\""); + memcpy(p->last_received_shutmsg, data, shutdown_comm_length + 1); + goto done; + } + } + else + { + if (len > 16) + len = 16; + for (i=0; i<len; i++) + t += bsprintf(t, "%02x", data[i]); + } } - done: - *t = 0; - log(L_REMOTE "%s: %s: %s%s", p->p.name, msg, name, argbuf); + + done: + *t = 0; + log(L_REMOTE "%s: %s: %s%s", p->p.name, msg, name, argbuf); } static void

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Version 1.6.2
by Ondrej Filip 31 Aug '17

31 Aug '17

Dear users, a new version of the 1.6.x branch is out: Version 1.6.2 (2016-09-29) o Fixes serious bug introduced in the previous version Upgrade from 1.6.1 is highly recommended. Enjoy it! Ondrej

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Re: Unexpected behavior of static routes
by Alexander Demenshin 10 Aug '17

10 Aug '17

On 2017-05-10 13:16, Ondrej Zajicek wrote: > But such design would bring plenty of issues w.r.t. multiple routing > tables - may next hops resolve just in the same routing table or also > in > another routing table? Well, at least in Linux device/direct routes may exist in any table, so where is the difference between device/direct routes and arbitrary next-hop route? How I would implement this: - Try to find if next-hop is routable via any of existing devices (including explicitly routed networks - as in my case); - If it is routable (which also means that device has to be up), install it (so it can be exported to the kernel tables). > What if the device route is available, but not exported to kernel? You mean if it is configured but not exported? Then it should be ignored, obviously, though this could happen only in few cases: - device does not exists (yet) - device is not up (kernel will not accept any routes in this case) - protocol is disabled If no kernel export is configured at all then the route does not make any sense anyway. > Static onlink routes is something that probably could be implemented > and > it is a good idea. This could solve one of the most typical scenarios - keep static (local) routes up for specified set of devices/gateways - once they become available. What is interesting, quagga behaves exactly in the same way as bird, and only cisco (well, may be other routers too) does what is (logically) expected - and it allows Linux-like onlink routes, which specify both device and gateway address, and those routes are linked to device state (i.e. exported and used when device is active). --- Best regards, Alexander.

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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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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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Injecting route into bird/ospf
by ico 28 Jul '17

28 Jul '17

Hello, I would like to hear some advices about bird on linux, what is the best way to inject some route into OSPF on bird. I want for my router to announce via OSPF to other routers that some IPs should be directed to it. Example: I want IPs 10.0.0.1/32 and 10.0.0.5/32 to be directed to my router. I would set dummy0 interface, set those IPs there, include dummy0 in OSPF and voila! the rest of network "knows" 10.0.0.1 and 10.0.0.5 is here. This doesn't seem as a good solution for me, because the traffic to 10.0.0.1 and 10.0.0.5 would then be NATed or modified in other way so these IPs really don't need to exist. I'd like to change these settings few times in an hour so writing it to bird config doesn't seem like a good solution. Is there a way to do it without setting IPs anywhere? Maybe set some custom local routing table for this and tell bird to announce routes found there? echo "25 mytable" >> /etc/iproute2/rt_tables ip route show table mytable # empty ip route add 10.0.0.1/32 dev lo table mytable ip route show table mytable # shows 10.0.0.1 on loopback # and now also bird picks up 10.0.0.1 and announces it What is the best way to do it "the most dynamic way"? Thank you ico

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