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20.7 GVRP Configuration
20.7.1 Introduction to GVRP
GVRP, i.e. GARP VLAN Registration Protocol, is an application of GARP (Generic Attribute
Registration Protocol). GARP is mainly used to establish an attribute transmission mechanism
to transmit attributes, so as to ensure protocol entities registering and deregistering the
attribute. According to different transmission attributes, GARP can be divided to many
application protocols, such as GMRP and GVRP. Therefore, GVRP is a protocol which
transmits VLAN attributes to the whole layer 2 network through GARP protocol.
Figure 20-10: a typical application scene
A and G switches are not directly connected in layer 2 network; BCDEF are intermediate
switches connecting A and G. Switch A and G configure VLAN100-1000 manually while
BCDEF switches do not. When GVRP is not enabled, A and G cannot communicate with each
other, because intermediate switches without relevant VLANs. However, after GVRP is
enabled on all switches, its VLAN attribute transmission mechanism enables the intermediate
switches registering the VLANs dynamically, and the VLAN in VLAN100-1000 of A and G can
communicate with each other. The VLANs dynamically registered by intermediate switches will
be deregistered when deregistering VLAN100-1000 of A and G switches manually. So the
same VLAN of two unadjacent switches can communicate mutually through GVRP protocol
instead of configuring each intermediate switch manually for achieving the purpose of
simplifying VLAN configuration.
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Troubleshooting
