redhat: Remove tab's with spaces in frr.spec.in to make it better readable

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@node  Installation
@chapter Installation

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

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 Frr running is to issue the following
commands:

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

@node Configure the Software
@section Configure the Software

@menu
* The Configure script and its options::
* Least-Privilege support::
* Linux notes::
@end menu

@node The Configure script and its options
@subsection The Configure script and its options

@cindex Configuration options
@cindex Options for configuring
@cindex Build options
@cindex Distribution configuration
@cindex Options to @code{./configure}
 
Frr has an excellent configure script which automatically detects most
host configurations.  There are several additional configure options to
customize the build to include or exclude specific features and dependencies.

@table @option
@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-snmp
Enable SNMP support.  By default, SNMP support is disabled.
@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 --disable-ospf-ri
Disable support for OSPF Router Information (RFC4970 & RFC5088) this
requires support for Opaque LSAs and Traffic Engineering.
@item --disable-isisd
Do not build isisd.
@item --enable-isis-topology
Enable IS-IS topology generator.
@item --enable-isis-te
Enable Traffic Engineering Extension for ISIS (RFC5305)
@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 --disable-rtadv
Disable support IPV6 router advertisement in zebra.
@item --enable-gcc-rdynamic
Pass the @command{-rdynamic} option to the linker driver.  This is in most
cases neccessary for getting usable backtraces.  This option defaults to on
if the compiler is detected as gcc, but giving an explicit enable/disable is
suggested.
@item --disable-backtrace
Controls backtrace support for the crash handlers. This is autodetected by
default. Using the switch will enforce the requested behaviour, failing with
an error if support is requested but not available.  On BSD systems, this
needs libexecinfo, while on glibc support for this is part of libc itself.
@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

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

This command will configure zebra and the routing daemons.

@node Least-Privilege support
@subsection Least-Privilege support

@cindex Frr Least-Privileges
@cindex Frr Privileges

Additionally, you may configure zebra to drop its elevated privileges
shortly after startup and switch to another user. The configure script will
automatically try to configure this support. There are three configure
options to control the behaviour of Frr daemons.

@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 'frr' 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 frr system will retain only minimal
capabilities required, further it will only raise these capabilities for
brief periods. On systems without libcap, frr will run as the user
specified and only raise its uid back to uid 0 for brief periods.

@node Linux notes
@subsection Linux Notes

@cindex Configuring Frr
@cindex Building on Linux boxes
@cindex Linux configurations

There are several options available only to @sc{gnu}/Linux systems:
@footnote{@sc{gnu}/Linux has very flexible kernel configuration features}.  If
you use @sc{gnu}/Linux, make sure that the current kernel configuration is
what you want.  Frr 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} (@pxref{RIP}) or
@command{ospfd} (@pxref{OSPFv2}) 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 Frr 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
@uref{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
@uref{http://www.tazenda.demon.co.uk/phil/net-tools/}.

@end table
@c A - end of footnote 

@node Build the Software
@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. Cliff Note versions of
different compilation examples can be found in the doc/Building_FRR_on_XXX.md
files.  If you have *any* problems at this stage, be certain to send a
bug report @xref{Bug Reports}.

@example
% ./bootstrap.sh
% ./configure <appropriate to your system>
% make
@end example
@c A - End of node, Building the Software


@node Install the Software
@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 Frr suite, issue the following command at your shell
prompt: @command{make install}.

@example
%
% make install
%
@end example

Frr 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
ospfapi       2607/tcp		  # ospfapi
isisd         2608/tcp		  # ISISd vty
pimd          2611/tcp		  # PIMd 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}.