14-35
Port-Based Virtual LANs (VLANs) and GVRP
GVRP
Port-Based Virtual LANs
(VLANs) and GVRP
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, o ne
or more Tagged or Untagged static 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 14-3, 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) o peration. These options are
controlled by the GVRP “Unknown VLAN” and the static VLAN configu ration
parameters, as described in the following table:
Table 14-3. Controlling VLAN Behavior on Ports with Static VLANs
Per-Port “Unknown
VLAN” (GVRP)
Configuration
Static VLAN Options—Per Specified VLAN on Each Port 1
Port Activity:
Tagged or Untagged (Per VLAN)2
Port Activity:
Auto2 (Per VLAN) Port Activity: Forbid
(Per VLAN)2
Learn
(the Default)
Generate advertisements.
Forward outbound advertisements
for other VLANs.
Receive advertisements and forward
them to other ports on the switch for
outbound transmission.
Allow the port to dynamically join the
specified VLAN if the port receiv es an
advertisement for that VLAN.
Do not allow the
specified VLAN on
this port.
Block Generate advertisements.
Forward outbound advertisements
received from other ports on the
switch for other VLANs.
Receive advertisements and forward
them to other ports on the switch for
outbound transmission.
Do not dynamically join the VLAN.
Do not allow the
specified VLAN on
this port.
Drop all GVRP VLAN
advertisements.
Disable Ignore GVRP and drop all GVRP
advertisements.
Ignore GVRP and drop all GVRP
advertisements.
Do not allow the
VLAN on this port.
1 Each port of a Switch 4108GL must be a Tagged or Untagged member of at least one VLAN. Thus, any port conf igured
for GVRP to Learn or Block will generate and forward adver tisements for static VLAN(s) configured on the switch an d
also for dynamic VLANs the switch learns on other ports . .
2 To configure tagging, Auto, or Forbid, see “Configuring Static VLAN Name and Per-Port Settings” on page 14-21 (for the
CLI) or “Adding or Changing a VLAN Port Assignment” on page 14-14 (for the menu).