Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual
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configuration and reload the software. The maximum number you can specify is listed in the
Maximum column of the show default values display.
• The default VLAN (VLAN 1) is not advertised by the Brocade implementation of GVRP. The default
VLAN contains all ports that are not members of statically configured VLANs or VLANs enabled for
GVRP.
NOTE
The default VLAN has ID 1 by default. You can change the VLAN ID of the default VLAN, but only
before GVRP is enabled. You cannot change the ID of the default VLAN after GVRP is enabled.
• Single STP must be enabled on the device. Brocade implementation of GVRP requires Single STP. If
you do not have any statically configured VLANs on the device, you can enable Single STP as
follows.
device(config)#vlan 1
device(config-vlan-1)#exit
device(config)#span
device(config)#span single
These commands enable configuration of the default VLAN (VLAN 1), which contains all the device
ports, and enable STP and Single STP.
• All VLANs that are learned dynamically through GVRP are added to the single spanning tree.
• All ports that are enabled for GVRP become tagged members of the GVRP base VLAN (4093). If you
need to use this VLAN ID for another VLAN, you can change the GVRP VLAN ID. Refer to
on page 220. The software adds the GVRP base VLAN to the single
spanning tree.
• All VLAN ports added by GVRP are tagged.
• GVRP is supported only for tagged ports or for untagged ports that are members of the default
VLAN. GVRP is not supported for ports that are untagged and are members of a VLAN other than
the default VLAN.
• To configure GVRP on a trunk group, enable the protocol on the primary port in the trunk group. The
GVRP configuration of the primary port is automatically applied to the other ports in the trunk group.
• You can use GVRP on a device even if the device has statically configured VLANs. GVRP does not
remove any ports from the statically configured VLANs, although GVRP can add ports to the VLANS.
GVRP advertises the statically configured VLANs. Ports added by GVRP do not appear in the
running-config and will not appear in the startup-config file when save the configuration. You can
manually add a port to make the port a permanent member of the VLAN. After you manually add the
port, the port will appear in the running-config and be saved to the startup-config file when you save
the configuration.
• VLANs created by GVRP do not support virtual routing interfaces or protocol-based VLANs. virtual
routing interfaces and protocol-based VLANs are still supported on statically configured VLANs even
if GVRP adds ports to those VLANs.
• You cannot manually configure any parameters on a VLAN that is created by GVRP. For example,
you cannot change STP parameters for the VLAN.
• The GVRP timers (Join, Leave, and Leaveall) must be set to the same values on all the devices that
are exchanging information using GVRP.
• If the network has a large number of VLANs, the GVRP traffic can use a lot of CPU resources. If you
notice high CPU utilization after enabling GVRP, set the GVRP timers to longer values. In particular,
set the Leaveall timer to a longer value. Refer to
on page 222.
• The feature is supported only on Ethernet ports.
NOTE
If you plan to change the GVRP base VLAN ID (4093) or the maximum configurable value for the
Leaveall timer (300000 ms by default), you must do so before you enable GVRP.
GVRP
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