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GVRP
Introduction
GVRP Operating Notes
■ A dynamic VLAN must be converted to a static VLAN before it can have
an IP address.
■ The total number of VLANs on the switch (static and dynamic combined)
cannot exceed the current Maximum VLANs setting. For example, in the
factory default state, the switch supports eight VLANs. Thus, in a case
where four static VLANs are configured on the switch, the switch can
accept up to four additional VLANs in any combination of static and
dynamic. Any additional VLANs advertised to the switch will not be added
unless you first increase the Maximum VLANs setting. In the Menu inter-
face, click on 2. Switch Configuration ... | 8. VLAN Menu | 1. VLAN Support. In
the global config level of the CLI, use max-vlans.
■ Converting a dynamic VLAN to a static VLAN and then executing the write
memory command saves the VLAN in the startup-config file and makes it
a permanent part of the switch’s VLAN configuration.
■ Within the same broadcast domain, a dynamic VLAN can pass through a
device that is not GVRP-aware. This is because a hub or a switch that is
not GVRP-ware will flood the GVRP (multicast) advertisement packets
out all ports.
■ GVRP assigns dynamic VLANs as Tagged VLANs. To configure the VLAN
as Untagged, you must first convert it to a static VLAN.
■ Rebooting a switch on which a dynamic VLAN exists deletes that VLAN.
However, the dynamic VLAN re-appears after the reboot if GVRP is
enabled and the switch again receives advertisements for that VLAN
through a port configured to add dynamic VLANs.
■ By receiving advertisements from other devices running GVRP, the switch
learns of static VLANs on those other devices and dynamically (automat-
ically) creates tagged VLANs on the links to the advertising devices.
Similarly, the switch advertises its static VLANs to other GVRP-aware
devices, as well as the dynamic VLANs the switch has learned.
■ A GVRP-enabled switch does not advertise any GVRP-learned VLANs out
of the port(s) on which it originally learned of those VLANs.
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