gvrpcd 1.0

GVRP stands for GARP (Generic Attribute Registration Protocol) VLAN
Registration Protocol. This project is 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.

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.

Compilation: simply run "make". Youll need libnet library header files.

For usage help, see gvrpcd -h. You may want to run gvrpcd as daemon (gvrpcd -d) or (like me) as foreground process controlled by init. My example inittab entry (Debian):

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

Format of VLAN config file (-f option) is compatible with kernels /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 ---