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2.1 Configure the Software

Quagga 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.

--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.
--disable-ipv6
Turn off IPv6 related features and daemons. Quagga configure script automatically detects IPv6 stack. But sometimes you might want to disable IPv6 support of Quagga.
--disable-zebra
Do not build zebra daemon.
--disable-ripd
Do not build ripd.
--disable-ripngd
Do not build ripngd.
--disable-ospfd
Do not build ospfd.
--disable-ospf6d
Do not build ospf6d.
--disable-bgpd
Do not build bgpd.
--disable-bgp-announce
Make bgpd which does not make bgp announcements at all. This feature is good for using bgpd as a BGP announcement listener.
--enable-netlink
Force to enable gnu/Linux netlink interface. Quagga 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.
--enable-snmp
Enable SNMP support. By default, SNMP support is disabled.
--enable-nssa
Enable support for Not So Stubby Area (see RC3101) in ospfd.
--enable-opaque-lsa
Enable support for Opaque LSAs (RFC2370) in ospfd.
--disable-ospfapi
Disable support for OSPF-API, an API to interface directly with ospfd. OSPF-API is enabled if –enable-opaque-lsa is set.
--disable-ospfclient
Disable building of the example OSPF-API client.
--enable-ospf-te
Enable support for OSPF Traffic Engineering Extension (internet-draft) this requires support for Opaque LSAs.
--enable-multipath=ARG
Enable support for Equal Cost Multipath. ARG is the maximum number of ECMP paths to allow, set to 0 to allow unlimited number of paths.
--enable-rtadv
Enable support IPV6 router advertisement in zebra.

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

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

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.

--enable-user=user
Switch to user ARG shortly after startup, and run as user ARG in normal operation.
--enable-group=group
Switch real and effective group to group shortly after startup.
--enable-vty-group=group
Create Unix Vty sockets (for use with vtysh) with group owndership set to 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.

The default user and group which will be configured is 'quagga' 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 quagga system will retain only minimal capabilities required, further it will only raise these capabilities for brief periods. On systems without libcap, quagga will run as the user specified and only raise its uid back to uid 0 for brief periods. 

     % ./configure --disable-ipv6

This command will configure zebra and the routing daemons.

There are several options available only to gnu/Linux systems: 1.

Footnotes

[1] GNU/Linux has very flexible kernel configuration features. If you use GNU/Linux, make sure that the current kernel configuration is what you want. Quagga will run with any kernel configuration but some recommendations do exist.

CONFIG_NETLINK
Kernel/User netlink socket. This is a brand new feature which enables an advanced interface between the Linux kernel and zebra (see Kernel Interface).
CONFIG_RTNETLINK
Routing messages. This makes it possible to receive netlink routing messages. If you specify this option, zebra can detect routing information updates directly from the kernel (see Kernel Interface).
CONFIG_IP_MULTICAST
IP: multicasting. This option should be specified when you use ripd or ospfd because these protocols use multicast.

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

inet6-apps
The inet6-apps package includes basic IPv6 related libraries such as inet_ntop and inet_pton. Some basic IPv6 programs such as ping, ftp, and inetd are also included. The inet-apps can be found at ftp://ftp.inner.net/pub/ipv6/.
net-tools
The net-tools package provides an IPv6 enabled interface and routing utility. It contains ifconfig, route, netstat, and other tools. net-tools may be found at http://www.tazenda.demon.co.uk/phil/net-tools/.