3-8
GVRP
Introduction
Per-Port Options for Dynamic VLAN Advertising and
Joining
Initiating Advertisements. As described in the preceding section, to
enable dynamic joins, GVRP must be enabled and a port must be configured
to Learn (the default). However, to send advertisements in your network, one
or more static (Tagged, Untagged, or Auto) VLANs must be configured on one
or more switches (with GVRP enabled), depending on your topology.
Enabling a Port for Dynamic Joins. You can configure a port to dynami-
cally join a static VLAN. The join will then occur if that port subsequently
receives an advertisement for the static VLAN. (This is done by using the Auto
and Learn options described in table 3-2, below.
Parameters for Controlling VLAN Propagation Behavior. You can con-
figure an individual port to actively or passively participate in dynamic VLAN
propagation or to ignore dynamic VLAN (GVRP) operation. These options are
controlled by the GVRP “Unknown VLAN” and the static VLAN configuration
parameters, as described in the following table:
Table 3-2. Controlling VLAN Behavior on Ports with Static VLANs
Per-Port
“Unknown
VLAN”
(GVRP)
Configuration
Static VLAN Options—Per VLAN Specified on Each Port
1
Port Activity:
Tagged or Untagged (Per VLAN)
2
Port Activity:
Auto
2
(Per VLAN)
Port Activity: Forbid (Per VLAN)
2
Learn
(the Default)
The port:
• Belongs to specified VLAN.
• Advertises specified VLAN.
• Can become a member of
dynamic VLANs for which it
receives advertisements.
• Advertises dynamic VLANs
that have at least one other
port (on the same switch) as a
member.
The port:
• Will become a member of
specified VLAN if it receives
advertisements for specified
VLAN from another device.
• Will advertise specified VLAN.
• Can become a member of
other, dynamic VLANs for
which it receives
advertisements.
• Will advertise a dynamic VLAN
that has at least one other port
(on the same switch) as a
member.
The port:
1. Will not become a member of
the specified VLAN.
1. Will not advertise specified
VLAN.
1. Can become a member of
other dynamic VLANs for
which it receives
advertisements.
1. Will advertise a dynamic VLAN
that has at least one other port
on the same switch as a
member.
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