Garp/Gvrp - TRENDnet TI-PG1284i User Manual

TRENDnet User's Guide

GARP/GVRP

GARP and GVRP are industry-standard protocols that are described in IEEE 802.1p. GVRP
is a GARP application that provides 802.1Q-compliant VLAN pruning and dynamic VLAN
creation on 802.1Q trunk ports.
With GVRP, the switch can exchange VLAN configuration information with other GVRP
switches, prune unnecessary broadcast and unknown unicast traffic, and dynamically
create and manage VLANs on switches that are connected through 802.1Q trunk ports.
GVRP makes use of GID and GIP, which provide the common state machine descriptions
and the common information propagation mechanisms defined for use in GARP-based
applications. GVRP prunes trunk links so that only active VLANs will be sent across trunk
connections. GVRP expects to hear join messages from the switches before it will add a
VLAN to the trunk. GVRP updates and hold timers can be altered. GVRP ports run in
various modes to control how they will prune VLANs. GVRP can be configured to
dynamically add and manage VLANS to the VLAN database for trunking purposes.
In other words, GVRP allows the propagation of VLAN information from device to device.
With GVRP, a single switch is manually configured with all the desired VLANs for the
network, and all other switches on the network learn those VLANs dynamically. An end-
node can be plugged into any switch and be connected to that end-node's desired VLAN.
For end-nodes to make use of GVRP, they need GVRP-aware Network Interface Cards
(NICs). The GVRP-aware NIC is configured with the desired VLAN or VLANs, then
connected to a GVRP-enabled switch. The NIC communicates with the switch, and VLAN
connectivity is established between the NIC and switch.
Registration Mode:

Normal : The normal registration mode allows dynamic creation (if dynamic
VLAN creation is enabled), registration, and deregistration of VLANs on the trunk
port. Normal mode is the default.

Forbidden: The forbidden registration mode deregisters all VLANs (except VLAN 1)
and prevents any further VLAN creation or registration on the trunk port.

Fixed : The fixed registration mode allows manual creation and registration
of VLANs, prevents VLAN deregistration, and registers all known VLANs on other
ports on the trunk port. (Same as the static VLAN)
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GVRP Timer:
Join Timer: Specifies the maximum number of milliseconds the interface waits before
sending VLAN advertisements.
Leave Timer: Specifies the number of milliseconds an interface waits after receiving a
leave message before the interface leaves the VLAN specified in the message.
Leaveall Timer: Specifies the interval in milliseconds at which Leave All messages are sent
on interfaces. Leave All messages help to maintain current GVRP VLAN membership
information in the network.
The value for leave must be greater than three times the join value (leave >= join * 3).
The value for leaveall must be greater than the value for leave (leaveall > leave).
Default Settings
The default port Join Time is 20 for all ports.
The default port Leave Time is 60 for all ports.
The default port Leaveall Time is 1000 for all ports.
The default port Hold Time is 10 for all ports.
CLI Configuration
Node Command
enable show gvrp
configuration
enable show gvrp statistics
enable show garp timer
configure gvrp (disable | enable)
configure no gvrp configuration
interface gvrp (disable | enable)
TI-PG1284i
Description
This command displays the GVRP
configurations.
This command displays the GVRP
configurations on a port or all ports.
This command displays the timers for the
GARP.
This command disables / enables the GVRP
on the switch.
This command set GVRP configuration to its
defaults.
This command disables / enables the GVRP
on the specific port.
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