@node  Installation, Basic commands, Overview, Top
@comment  node-name,  next,  previous,  up
@chapter Installation

@cindex How to install Zebra
@cindex Installation
@cindex Installing Zebra
@cindex Building the system
@cindex Making Zebra

  There are three steps for installing the software: configuration,
compilation, and installation.

@menu
* Configure the Software::      
* Build the Software::          
* Install the Software::        
@end menu

  The easiest way to get Zebra running is to issue the following
commands:

@example
% configure
% make
% make install
@end example

@node Configure the Software, Build the Software, Installation, Installation
@comment  node-name,  next,  previous,  up
@section Configure the Software

@cindex Configuration options
@cindex Options for configuring
@cindex Build options
@cindex Distribution configuration
@cindex Options to @code{./configure}
 
  Zebra has an excellent configure script which
automatically detects most host configurations.  There are several
additional configure options you can use to turn off IPv6 support, to
disable the compilation of specific daemons, and to enable SNMP support.

@table @option
@item --enable-guile
Turn on compilation of the zebra-guile interpreter.  You will need the
guile library to make this.  zebra-guile implementation is not yet
finished.  So this option is only useful for zebra-guile developers.
@item --disable-ipv6
Turn off IPv6 related features and daemons.  Zebra configure script
automatically detects IPv6 stack.  But sometimes you might want to
disable IPv6 support of Zebra.
@item --disable-zebra
Do not build zebra daemon.
@item --disable-ripd
Do not build ripd.
@item --disable-ripngd
Do not build ripngd.
@item --disable-ospfd
Do not build ospfd.
@item --disable-ospf6d
Do not build ospf6d.
@item --disable-bgpd
Do not build bgpd.
@item --disable-bgp-announce
Make @command{bgpd} which does not make bgp announcements at all.  This
feature is good for using @command{bgpd} as a BGP announcement listener.
@item --enable-netlink
Force to enable @sc{gnu}/Linux netlink interface.  Zebra configure
script detects netlink interface by checking a header file.  When the header
file does not match to the current running kernel, configure script will
not turn on netlink support.
@item --enable-snmp
Enable SNMP support.  By default, SNMP support is disabled.
@item --enable-nssa
Enable support for Not So Stubby Area (see RC3101) in ospfd.
@item --enable-opaque-lsa
Enable support for Opaque LSAs (RFC2370) in ospfd.
@item --disable-ospfapi
Disable support for OSPF-API, an API to interface directly with ospfd.
OSPF-API is enabled if --enable-opaque-lsa is set.
@item --disable-ospfclient
Disable building of the example OSPF-API client.
@item --enable-ospf-te
Enable support for OSPF Traffic Engineering Extension (internet-draft) this
requires support for Opaque LSAs.
@item --enable-multipath=@var{ARG}
Enable support for Equal Cost Multipath. @var{ARG} is the maximum number
of ECMP paths to allow, set to 0 to allow unlimited number of paths.
@item --enable-rtadv
Enable support IPV6 router advertisement in zebra.
@end table

You may specify any combination of the above options to the configure
script.  By default, the executables are placed in @file{/usr/local/sbin} 
and the configuration files in @file{/usr/local/etc}. The @file{/usr/local/}
installation prefix and other directories may be changed using the following 
options to the configuration script.

@table @option
@item --prefix=@var{prefix}
Install architecture-independent files in @var{prefix} [/usr/local].
@item --sysconfdir=@var{dir}
Look for configuration files in @var{dir} [@var{prefix}/etc]. Note
that sample configuration files will be installed here.
@item --localstatedir=@var{dir}
Configure zebra to use @var{dir} for local state files, such
as pid files and unix sockets.
@end table

Additionally, you may configure zebra to drop its elevated
privileges shortly after startup and switch
to another user, there are three configure options
to control zebra's behaviour.

@table @option
@item --enable-user=@var{user}
Switch to user @var{ARG} shortly after startup, and run as user @var{ARG}
in normal operation.
@item --enable-group=@var{group}
Switch real and effective group to @var{group} shortly after
startup. 
@item --enable-vty-group=@var{group}
Create Unix Vty sockets (for use with vtysh) with group owndership set to
@var{group}. This allows one to create a seperate group which is
restricted to accessing only the Vty sockets, hence allowing one to
delegate this group to individual users, or to run vtysh setgid to
this group.
@end table

The default user and group which will be configured is 'zebra' if no user
or group is specified. Note that this user or group requires write access
to the local state directory (see --localstatedir) and requires at least
read access, and write access if you wish to allow daemons
to write out their configuration, to the configuration directory
(see --sysconfdir).

On systems which have the 'libcap' capabilities manipulation library
(currently only linux), the zebra system will retain
only minimal capabilities required, further it will only raise these
capabilities for brief periods. On systems without libcap, zebra will run
as the user specified and only raise its uid back to uid 0 for brief
periods.

@example
% ./configure --disable-ipv6
@end example

This command will configure zebra and the routing daemons.

@cindex Configuring Zebra
@cindex Configuration the software build
@cindex Building on Linux boxes
@cindex Linux configurations

There are several options available only to @sc{gnu}/Linux systems:
@footnote{GNU/Linux has very flexible kernel configuration features.  If
you use GNU/Linux, make sure that the current kernel configuration is
what you want.  Zebra will run with any kernel configuration but some
recommendations do exist.

@table @var

@item CONFIG_NETLINK
Kernel/User netlink socket.  
This is a brand new feature which enables
an advanced interface between the Linux kernel and Zebra (@pxref{Kernel Interface}).

@item CONFIG_RTNETLINK
Routing messages.
This makes it possible to receive netlink routing messages.  If you
specify this option, @command{zebra} can detect routing information
updates directly from the kernel (@pxref{Kernel Interface}).

@item CONFIG_IP_MULTICAST
IP: multicasting.  
This option should be specified when you use @command{ripd} or
@command{ospfd} because these protocols use multicast.

@end table

IPv6 support has been added in @sc{gnu}/Linux kernel version 2.2.  If you
try to use the Zebra IPv6 feature on a @sc{gnu}/Linux kernel, please
make sure the following libraries have been installed.  Please note that
these libraries will not be needed when you uses @sc{gnu} C library 2.1
or upper.

@table @code

@item inet6-apps
The @code{inet6-apps} package includes basic IPv6 related libraries such
as @code{inet_ntop} and @code{inet_pton}.  Some basic IPv6 programs such
as @command{ping}, @command{ftp}, and @command{inetd} are also
included. The @code{inet-apps} can be found at
@url{ftp://ftp.inner.net/pub/ipv6/}.

@item net-tools
The @code{net-tools} package provides an IPv6 enabled interface and
routing utility.  It contains @command{ifconfig}, @command{route},
@command{netstat}, and other tools.  @code{net-tools} may be found at
@url{http://www.tazenda.demon.co.uk/phil/net-tools/}.

@end table
@c A - end of footnote 
}.

@node Build the Software, Install the Software, Configure the Software, Installation
@comment  node-name,  next,  previous,  up
@section Build the Software

After configuring the software, you will need to compile it for your
system. Simply issue the command @command{make} in the root of the source
directory and the software will be compiled. If you have *any* problems
at this stage, be certain to send a bug report @xref{Bug Reports}.

@example
% ./configure
.
.
.
./configure output
.
.
.
% make
@end example
@c A - End of node, Building the Software


@node Install the Software,  , Build the Software, Installation
@comment  node-name,  next,  previous,  up
@section Install the Software

Installing the software to your system consists of copying the compiled
programs and supporting files to a standard location. After the
installation process has completed, these files have been copied
from your work directory to @file{/usr/local/bin}, and @file{/usr/local/etc}.

To install the Zebra suite, issue the following command at your shell
prompt: @command{make install}.

@example
%
% make install
%
@end example

@c A - removed this section and placed it with Install the Software
@c @node Additional Notes,  , Install the Software, Installation
@comment  node-name,  next,  previous,  up
@c @section Additional Notes

Zebra daemons have their own terminal interface or VTY.  After
installation, you have to setup each beast's port number to connect to
them.  Please add the following entries to @file{/etc/services}.

@example
zebrasrv      2600/tcp		  # zebra service
zebra         2601/tcp		  # zebra vty
ripd          2602/tcp		  # RIPd vty
ripngd        2603/tcp		  # RIPngd vty
ospfd         2604/tcp		  # OSPFd vty
bgpd          2605/tcp		  # BGPd vty
ospf6d        2606/tcp		  # OSPF6d vty
@end example

If you use a FreeBSD newer than 2.2.8, the above entries are already
added to @file{/etc/services} so there is no need to add it. If you
specify a port number when starting the daemon, these entries may not be
needed.

You may need to make changes to the config files in
@file{@value{INSTALL_PREFIX_ETC}/*.conf}. @xref{Config Commands}.