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   gvrpcd - linux GVRP client daemon
=======================================

"GVRP stands for GARP (Generic Attribute Registration Protocol) VLAN
Registration Protocol. It's a Layer 2 network protocol, for automatic
configuration of switches in a VLAN network. 

Each VLAN switch is configured with the VLANs it is part of. GVRP will
spread this information and configure the needed VLANs. 

So to add a switch to a VLAN, only 1 switch needs to be reconfigured. This
is not the case within a standard VLAN, where all switches might need
reconfiguration." [1]

gvrpcd implements end-node GVRP functionality as a user-space daemon.
It generates periodically GVRP "JOIN" packets with information about
VLANs that server has defined on given NIC, or more generically - that it
wants to be able to connect to.

This is especially useful for Linux-based routers or firewalls that use
lots of VLANs. As new VLANs show up, or old ones are deleted, switch
automatically reconfigures port VLANs membership.

Requirements: libnet (tested with version 1.1.2.1)

Compilation: simply run "make". You'll need libnet library header files.

For usage help, see gvrpcd -h.

My preferred way of running gvrpcd is as foreground process controlled by init.
My example inittab entry (Debian):

gvrp:23:respawn:/usr/local/sbin/gvrpcd -i eth0 -t 3

Other way is to start gvrpcd in daemon mode (-d option). You may find
attached .init script useful for running gvrpcd on boot in daemon mode. Just
put it in /etc/init.d, create symlinks in runlevel directories, copy
.sysconfig file to /etc/sysconfig or /etc/defaults (depending on your
distribution) and edit INTERFACES list. You can also edit INTERFACES
directly in .init file.

Init scripts can also take list of interfaces as command-line arguments.

Format of VLAN config file (-f option) is compatible with
kernel's /proc/net/vlan/config file: two lines of file header (ignored),
and in following lines VLAN configuration (one line per VLAN):

<interface description (ignored)> | <VLAN ID>  | <interface>

Notice two spaces after VLAN ID. Example:

--- CUT HERE ---
blahblahignore
blahblahignore
blah | 123  | eth0
blah | 124  | eth0
--- CUT HERE ---


(c) Sebastian Zagrodzki <s.zagrodzki@net.icm.edu.pl>, 2007

[1] http://wiki.wireshark.org/GVRP, 20090304