3Com MSR 50 Series, Руководство по настройке

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274 C
HAPTER
12: GVRP C
ONFIGURATION
GVRP GVRP enables a device to propagate local VLAN registration information to other
participant devices and dynamically update the VLAN registration information
from other devices to its local database about active VLAN members and through
which port they can be reached. It thus ensures that all GVRP participants on a
bridged LAN maintain the same VLAN registration information. The VLAN
registration information propagated by GVRP includes both manually configured
local static entries and dynamic entries from other devices.
GVRP provides the following three registration types on a port:
■
Normal: Enables the port to dynamically register and deregister VLANs, and to
propagate both dynamic and static VLAN information.
■
Fixed: Disables the port to dynamically register and deregister VLANs or
propagate information about dynamic VLANs, but allows the port to propagate
information about static VLANs. A trunk port with fixed registration type thus
allows only manually configured VLANs to pass through even though it is
configured to carry all VLANs.
■
Forbidden: Disables the port to dynamically register and deregister VLANs, and
to propagate VLAN information except information about VLAN 1. A trunk
port with forbidden registration type thus allows only VLAN 1 to pass through
even though it is configured to carry all VLANs.
Protocols and Standards IEEE 802.1Q specifies GVRP.
Message One or multiple messages, each
containing an attribute type and an
attribute list --
Attribute Type Defined by the concerned GARP
application 0x01 for GVRP, indicating the
VLAN ID attribute
Attribute List Contains one or multiple attributes --
Attribute Consists of an Attribute Length, an
Attribute Event, and an Attribute Value --
Attribute Length Number of octets occupied by an
attribute, inclusive of the attribute length
field 2 to 255 in bytes
Attribute Event Event described by the attribute 0: LeaveAll Event
1: JoinEmpty Event
2: JoinIn Event
3: LeaveEmpty Event
4: LeaveIn Event
5: Empty Event
Attribute Value Attribute value VLAN ID for GVRP
If the Attribute Event is
LeaveAll, Attribute Value is
omitted.
End Mark Indicates the end of a GARP PDU 0x00
Table 2 Description on the GARP message fields
Field Description Value