Gvrp; Protocols And Standards - 3Com MSR 50 Series Configuration Manual

274 C 12: GVRP C
HAPTER

GVRP

Protocols and Standards

ONFIGURATION
Table 2 Description on the GARP message fields
Field
Message
Attribute Type
Attribute List
Attribute
Attribute Length
Attribute Event
Attribute Value
End Mark
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.
IEEE 802.1Q specifies GVRP.
Description
One or multiple messages, each
containing an attribute type and an
attribute list
Defined by the concerned GARP
application
Contains one or multiple attributes
Consists of an Attribute Length, an
Attribute Event, and an Attribute Value
Number of octets occupied by an
attribute, inclusive of the attribute length
field
Event described by the attribute
Attribute value
Indicates the end of a GARP PDU
Value
--
0x01 for GVRP, indicating the
VLAN ID attribute
--
--
2 to 255 in bytes
0: LeaveAll Event
1: JoinEmpty Event
2: JoinIn Event
3: LeaveEmpty Event
4: LeaveIn Event
5: Empty Event
VLAN ID for GVRP
If the Attribute Event is
LeaveAll, Attribute Value is
omitted.
0x00