Dell PowerConnect 3248 System User's Manual page 34

GARP Join Timer — Specifies the interval (in centiseconds) between transmitting requests/queries to participate in a VLAN group. (The range is 20 to
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1000 centiseconds.)
GARP Leave Timer — Specifies the interval (in centiseconds) that a trunk waits before leaving a VLAN group. GARP Leave Timer should be set to more
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than twice the join time. This interval ensures that after a Leave or LeaveAll message has been issued, the applicants can rejoin before the trunk
actually leaves the group. (The range is 60 to 3000 centiseconds.)
GARP LeaveAll Timer —Specifies the interval (in centiseconds) between when a LeaveAll query message for VLAN group participants is sent and when
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the trunk leaves the group. This interval should be considerably larger than the Leave Time to minimize the amount of traffic generated by nodes
rejoining the group. (The range is 500 to 18000 centiseconds.)
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GVRP
The GVRP page allows you to globally enable GVRP (GARP VLAN Registration Protocol) for the switch. GVRP defines a way for switches to exchange VLAN
information to register VLAN members on ports across the network. You can use GVRP to set up VLANs in the network without having to manually configure
the VLANs on each switch. GVRP can reduce the possibility of errors and ensure consistency in VLAN configuration throughout the network.
If you enable GVRP on a port with a tagged or untagged static VLAN, GVRP sends advertisements (GVRP Bridge Protocol Data Units [BPDUs]) containing the
VLAN's ID. Any connected GVRP-aware port receiving the advertisements can dynamically join the advertised VLAN. All GVRP dynamically-learned VLANs
operate as tagged VLANs. A GVRP-enabled port only joins a VLAN when an advertisement for that VLAN is received on that specific port. A GVRP-enabled port
forwards advertisements from other ports on the switch but does not join the advertised VLAN.
To implement GVRP in a network, you must first configure the static VLANs required on switches that are connected to computers, servers, and other devices,
so that these VLANs can be propagated across the network. For other core switches in the network, enable GVRP on the links between these devices. You
should also determine security boundaries in the network and configure GVRP settings to limit the VLAN propagation.
When GVRP is globally enabled for the switch, the default setting allows all the ports to transmit and receive VLAN advertisements, as well as automatically
join VLANs. To control and limit the VLAN propagation in a network, you can disable GVRP on ports to prevent advertisements from being propagated, or to
forbid ports from joining specific VLANs. The VLAN Membership page allows you to set ports as Forbidden, which prevents them from joining a VLAN through
GVRP.
NOTICE: GVRP-learned VLANs on the switch do not have assigned IP addresses. Therefore, the management VLAN must be statically configured on all
switches in the network before you implement GVRP.
For more information on VLANs and GVRP see "VLANs."
NOTICE: GVRP must be globally enabled for the switch before you can individually enable GVRP for a specific port or trunk.
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CLI Commands
The following table summarizes the equivalent CLI commands for items in the VLAN/GVRP page.
Command
bridge-ext gvrp
Usage
Enables GVRP for the switch.
Use the no form command to disable it.