.\" $OpenBSD: bgpd.conf.5,v 1.13 2004/01/07 12:33:15 claudio Exp $ .\" .\" Copyright (c) 2003, 2004 Henning Brauer .\" Copyright (c) 2002 Daniel Hartmeier .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd December 23, 2003 .Dt BGPD.CONF 5 .Os .Sh NAME .Nm bgpd.conf .Nd Border Gateway Protocol daemon configuration file .Sh DESCRIPTION The .Ar bgpd daemon implements the Border Gateway Protocol version 4 as described in RFC 1771. .Sh SECTIONS The .Nm config file is divided into three main sections. .Bl -tag -width xxxx .It Cm Macros User-defined variables may be defined and used later, simplifying the configuration file. .It Cm Global configuration Global settings for the bgpd daemon. .It Cm Neighbors and Groups .Ar bgpd establishes sessions with .Ar neighbors . The neighbor definition and properties are set in this section, as well as grouping neighbors for the ease of configuration. .El .Pp With the exception of .Cm macros the sections should be grouped and appear in .Nm in the order shown above. .Sh MACROS Much like .Xr cpp 1 or .Xr m4 1 , macros can be defined that will later be expanded in context. Macro names must start with a letter, and may contain letters, digits and underscores. Macro names may not be reserved words (for example .Ar AS , .Ar neighbor , .Ar group ) . Macros are not expanded inside quotes. .Pp For example, .Bd -literal -offset indent c7206="1.2.3.4" neighbor $c7206 { remote-as 65001 } .Ed .Sh GLOBAL CONFIGURATION There are quite a few settings that affect the operation of the .Ar bgpd daemon globally. .Bl -tag -width xxxxxxxx .It Ar AS Set the local Autonomous System number. The AS numbers are assigned by local RIRs, such as .Bl -tag -width xxxxx -compact .It Ar RIPE for Europe, .It Ar ARIN for America and .It Ar APNIC for the Asian-Pacific region. .El .Pp For example, .Bd -literal -offset indent AS 65001 .Ed .Pp sets the local .Ar AS to 65001. .It Ar router-id Set the router id to the given IP address which must be local to the machine. .Bd -literal -offset indent router-id 10.0.0.1 .Ed .Pp If not given the bgp id is determined as the biggest IP address assigned to the local machine. .It Ar holdtime Sets the holdtime in seconds. The holdtime is reset to its initial value every time either a .Em KEEPALIVE or an .Em UPDATE message is received from the neighbor. If the holdtime expires the session is dropped. The default is 90 seconds. Neighboring systems negotiate the holdtime used when the connection is established in the .Em OPEN messages. Each neighbor announces its configured holdtime, the smaller one is then agreed on. .It Ar holdtime min The minimal accepted holdtime in seconds. Must be greater or equal to 3. .It Ar listen on Specify the local IP address the .Ar bgpd daemon should listen on. .Bd -literal -offset indent listen on 127.0.0.1 .Ed .It Ar log updates Log received and sent updates. .It Ar fib-update If set to .Em no , do not update the Forward Information Base aka the kernel routing table. The default is .Em yes . .It Ar dump .Ar bgpd is capable of dumping the .Em RIB , aka the Routing Information Base and all .Em bgp messages in .Em mrt format. Dumping the .Em RIB is normally an expensive operation but it should not influence the session handling. Dumping too often may result in a slow update speed. .Pp This will dump all 300 seconds of the .Em RIB table to the .Xr strftime 3 expanded filename. The timeout is optional. .Bd -literal -offset indent dump table "/tmp/rib-dump-%H%M" 300 .Ed .Pp Similar to the table dump but this time all .Em bgp messages and .Em state transitions are dumped to the specified file: .Bd -literal -offset indent dump msg all in "/tmp/all-in-%H%M" 300 .Ed .Pp As before, but only the filtered .Em UPDATE messages are dumped to the file: .Bd -literal -offset indent dump msg filtered in "/tmp/filtered-in-%H%M" 300 .Ed .El .Sh NEIGHBORS AND GROUPS .Ar bgpd establishes TCP connections to other BGP speakers, called neighbors. Each neighbor is specified by a neighbor section, specifying properties for that neighbor: .Bd -literal -offset indent neighbor 10.0.0.2 { remote-as 65002 descr "a neighbor" } .Ed .Pp Multiple neighbors can be grouped together by a group section. Each neighbor statement within the group section inherits all properties from the group section. .Bd -literal -offset indent group "peering AS65002" { remote-as 65002 neighbor 10.0.0.2 { descr "AS65002-p1" } neighbor 10.0.0.3 { descr "AS65002-p2" } } .Ed .Pp There are several neighbor properties: .Bl -tag -width xxxxxxxx .It Ar remote-as Set the AS number of the remote system. .It Ar descr Add a description. The description is used when logging neighbor events and in status reports etc and has no further meaning to .Ar bgpd . .It Ar local-address When .Ar bgpd initiates the TCP connection to the neighbor system, it normally does not bind to a specific IP address. If a local-address is given it binds to this address before. .It Ar multihop Normally neighbors that are not in the same AS as the local .Ar bgpd have to be directly connected to the local machine. If this is not the case the .Em multihop statement defines the maximum hops the neighbor is away. .It Ar passive Do not attempt to actively open a TCP connection to the neighbor system. .It Ar holdtime Set the holdtime in seconds. Inherited from the global configuration if not given. .It Ar holdtime min Set the minimal acceptable holdtime. Inherited from the global configuration if not given. .El .Sh FILES .Bl -tag -width "/etc/bgpd.conf" -compact .It Pa /etc/bgpd.conf .Nm configuration file. .El .Sh SEE ALSO .Xr strftime 3 , .Xr bgpd 8 .Sh HISTORY The .Nm file format first appeared in .Ox 3.5 .