.\" $OpenBSD: bgpd.8,v 1.25 2007/04/26 14:16:45 claudio Exp $
.\"
.\" Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
.\"
.\" 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 22, 2003
.Dt BGPD 8
.Os
.Sh NAME
.Nm bgpd
.Nd "Border Gateway Protocol daemon"
.Sh SYNOPSIS
.Nm bgpd
.Bk -words
.Op Fl cdnv
.Oo Xo
.Fl D Ar macro Ns = Ns Ar value Oc
.Xc
.Op Fl f Ar file
.Op Fl r Ar path
.Op Fl s Ar path
.Ek
.Sh DESCRIPTION
.Nm
is a Border Gateway Protocol
.Pq BGP
daemon which manages the network routing tables.
Its main purpose is to exchange information
concerning
.Qq network reachability
with other BGP systems.
.Nm
uses the Border Gateway Protocol, Version 4,
as described in RFC 1771.
Please refer to that document for more information about BGP.
.Pp
.Nm
is usually started at boot time, and can be enabled by
setting the following in
.Pa /etc/rc.conf.local :
.Pp
.Dl bgpd_flags=\&"\&"
.Pp
See
.Xr rc 8
and
.Xr rc.conf 8
for more information on the boot process
and enabling daemons.
.Pp
When
.Nm
starts up, it reads settings from a configuration file,
typically
.Xr bgpd.conf 5 .
A running
.Nm
process can be controlled using the
.Xr bgpctl 8
utility.
.Pp
The options are as follows:
.Bl -tag -width "-f fileXXX"
.It Fl c
Force
.Nm
to do
.Xr carp 4
demotion at startup when the
.Em demote
functionality is used.
Normally,
.Nm
will only do demotion at startup when the demotion counter for the group
in question is already greater than 0.
.Nm
will start handling demotion after all sessions with demotion configured for
the given group have been successfully established.
At system startup,
.Xr rc 8
has the demotion counter for the group
.Em carp
increased until after
.Nm
is started, so this option should
.Em not
be used in
.Xr rc.conf 8 .
.It Fl D Ar macro Ns = Ns Ar value
Define
.Ar macro
to be set to
.Ar value
on the command line.
Overrides the definition of
.Ar macro
in the configuration file.
.It Fl d
Do not daemonize.
If this option is specified,
.Nm
will run in the foreground and log to
.Em stderr .
.It Fl f Ar file
Use
.Ar file
as the configuration file,
instead of the default
.Pa /etc/bgpd.conf .
.It Fl n
Configtest mode.
Only check the configuration file for validity.
.It Fl r Ar path
Open a second, restricted, control socket that
.Xr bgpctl 8
can use.
Only
.Em show
requests are allowed on this socket.
.It Fl s Ar path
Use an alternate location for the default control socket.
.It Fl v
Produce more verbose output.
.El
.Sh FILES
.Bl -tag -width "/var/run/bgpd.sockXXX" -compact
.It Pa /etc/bgpd.conf
default
.Nm
configuration file
.It Pa /var/run/bgpd.sock
default
.Nm
control socket
.El
.Sh SEE ALSO
.Xr bgpd.conf 5 ,
.Xr bgpctl 8 ,
.Xr bgplg 8 ,
.Xr bgplgsh 8
.Rs
.%R RFC 1771
.%T "A Border Gateway Protocol 4 (BGP-4)"
.%D March 1995
.Re
.Rs
.%R RFC 1997
.%T "BGP Communities Attribute"
.%D August 1996
.Re
.Rs
.%R RFC 2385
.%T "Protection of BGP Sessions via the TCP MD5 Signature Option"
.%D August 1998
.Re
.Rs
.%R RFC 2796
.%T "BGP Route Reflection - An Alternative to Full Mesh IBGP"
.%D April 2000
.Re
.Rs
.%R RFC 2918
.%T "Route Refresh Capability for BGP-4"
.%D September 2000
.Re
.Rs
.%R RFC 3392
.%T "Capabilities Advertisement with BGP-4"
.%D January 1999
.Re
.Rs
.%R RFC 3765
.%T "NOPEER Community for Border Gateway Protocol"
.%D April 2004
.Re
.Rs
.%R RFC 3682
.%T "The Generalized TTL Security Mechanism (GTSM)"
.%D February 2004
.Re
.Rs
.%R RFC 4760
.%T "Multiprotocol Extensions for BGP-4"
.%D January 2007
.Re
.Rs
.%R draft-ietf-idr-as4bytes-13
.%T "BGP Support for Four-octet AS Number Space"
.%D February 2007
.Re
.Sh HISTORY
The
.Nm
program first appeared in
.Ox 3.5 .