H3C Technologies H3C S3100 Series Switches - Manual (Page 115)

Operation Manual – GVRP
H3C S3100-52P Ethernet Switch Chapter 1 GVRP Configuration
1-1
Chapter 1 GVRP Configuration
1.1 Introduction to GVRP
GARP VLAN registration protocol (GVRP) is an implementation of generic attribute
registration protocol (GARP). It maintains dynamic VLAN registration information and
propagates the information to other switches by adopting the same mechanism as that
of GARP.
Note:
GARP provides a mechanism for the switching members in a switched network to
register, distribute and propagate information about VLANs, multicast addresses, and
so on between each other.
After the GVRP feature is enabled on a switch, the switch receives the VLAN
registration information from other switches to dynamically update the local VLAN
registration information (including VLAN members, ports through which the VLAN
members can be reached, and so on). The switch also propagates the local VLAN
registration information to other switches so that all the switching devices in the same
switched network can have the same VLAN information. The VLAN registration
information includes not only the static registration information configured locally, but
also the dynamic registration information received from other switches.
1.1.1 GVRP Mechanism
I. GARP timers
The information exchange between GARP members is completed by messages. The
messages performing important functions for GARP fall into three types: Join, Leave
and LeaveAll.
z
When a GARP entity expects other switches to register certain attribute
information of its own, it sends out a Join message.
z
When a GARP entity expects other switches to unregister certain attribute
information of its own, it sends out a Leave message.
z
Once a GARP entity starts up, it starts the LeaveAll timer. After the timer times out,
the GARP entity sends out a LeaveAll message.
The Join message and the Leave message are used together to complete the
unregistration and re-registration of information. Through message exchange, all the