GARP VLAN Registration Protocol

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GARP VLAN Registration Protocol (GVRP) 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 with manual reconfiguration, which might need to be applied on all the switches in the network.

It is through GVRP that Dynamic VLAN entries will be updated in the Filtering Database. In short, GVRP helps to maintain VLAN configuration dynamically based on current network configurations.

802.1Q allows for:

  1. Dynamic configuration and distribution of VLAN membership information by means of the GARP VLAN Registration Protocol (GVRP).
  2. Static configuration of VLAN membership information via Management mechanisms, which allow configuration of Static VLAN Registration Entries.

The GARP VLAN Registration Protocol (GVRP) defines a GARP Application that provides the VLAN registration service. GVRP makes use of GARP Information Declaration (GID) and GARP Information Propagation (GIP), which provide the common state machine descriptions and the common information propagation mechanisms defined for use in GARP-based applications. GVRP provides a mechanism for dynamic maintenance of the contents of Dynamic VLAN Registration Entries for each VLAN, and for propagating the information they contain to other Bridges. This information allows GVRP-aware devices to dynamically establish and update their knowledge of the set of VLANs that currently have active members, and through which Ports those members can be reached.

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