![Atop EH9711 Series Скачать руководство пользователя страница 140](http://html1.mh-extra.com/html/atop/eh9711-series/eh9711-series_user-manual_3004814140.webp)
Industrial Managed
Ethernet Switch – EH9711
User Manual
Page
140
of
223
GVRP can be used to keep VLAN configurations on trunk interfaces organized across the network on large networks that
consist of dozens or even hundreds of VLAN segments. There are three benefits for administrators that enable GVRP on a
network:
It enables switches to automatically delete unused VLANs so that only the VLANs that are in use are transported
across 802.1Q trunk links.
It enables admins to configure a new VLAN on one switch and then have it propagate the configuration across all
network switches participating in the GVRP process.
GVRP can eliminate some unnecessary broadcast traffic on the network, reducing bandwidth overhead used for
network management.
GVRP works as follows. When two or more switches are connected via 802.1Q trunk ports with GVRP enabled in a network,
these switches will begin to communicate statically or dynamically through VLAN information. Switches with statically
configured VLANs will advertise them to connected switches using GVRP data units. Those units are specifically designed
management packets used to share VLAN information. If a switch learns of a new VLAN from its neighbor, this VLAN is
added to the list of VLAN tags that can be transported across the link The VLAN that learned the new information can then
pass along its own statically configured VLANs, in addition to ones learned from its neighbor. For loop avoidance, switch
cannot send dynamically learned VLAN information out the same interface that it was learned on.
All the dynamically learned VLAN information
is stored in switch memory. So, if power is lost or the switch is rebooted, the
dynamically learned VLAN information is lost, and the VLANs are pruned from the trunk interface. But, once the switches
begin communication again, they will relearn the shared VLAN information to bring the network and all VLANs back into a
fully informed state.
2.17.1
Global config
This GVRP
Global config webpage shown in Figure 2.115 allows the user to configure the global GVRP configuration
settings that are commonly applied to all GVRP enabled ports.
Figure 2.115 Webpage to Configure GVRP Globally
Table 2.103 Descriptions of GVRP Globally Configuration
Label
Description
Factory
Default
Join-time
Join-time is a value in the range of 1-20cs, i.e. in units of one hundredth of a
second. The default value is 20cs
20
Leave-time
Leave-time is a value in the range of 60-300cs, i.e. in units of one hundredth of a
second. The default is 60cs.
60
LeaveAll-time
LeaveAll-time is a value in the range of 1000-5000cs, i.e. in units of one
hundredth of a second. The default is 1000cs.
1000
Max VLANs
When GVRP is enabled, a maximum number of VLANs supported by GVRP is
specified. By default, this number is 20. This number can only be changed when
GVRP is turned off.
20