RUGGEDCOM ROX II
User Guide
Chapter 5
Setup and Configuration
Forbidden Ports List
727
Section 5.35.1.5
Forbidden Ports List
Each VLAN can be configured to exclude ports from membership in the VLAN using the forbidden ports list. For
more about configuring a list of forbidden ports, refer to
Section 5.35.5, “Managing Forbidden Ports”
Section 5.35.1.6
VLAN-Aware Mode of Operation
The native operation mode for an IEEE 802.1Q compliant switch is VLAN-aware. Even if a specific network
architecture does not use VLANs, ROX II's default VLAN settings allow the switch to still operate in a VLAN-
aware mode, while providing functionality required for almost any network application. However, the IEEE 802.1Q
standard defines a set of rules that must be followed by all VLAN-aware switches:
• Valid VIDs are within the range of 1 to 4094. VIDs equal to 0 or 4095 are invalid.
• Each frame ingressing a VLAN-aware switch is associated with a valid VID.
• Each frame egressing a VLAN-aware switch is either untagged or tagged with a valid VID. Priority-tagged
frames with an invalid VID will never sent out by a VLAN-aware switch.
NOTE
Some applications have requirements conflicting with IEEE 802.Q native mode of operation. For
example, some applications explicitly require priority-tagged frames to be received by end devices.
Section 5.35.1.7
GARP VLAN Registration Protocol (GVRP)
GARP VLAN Registration Protocol (GVRP) is a standard protocol built on GARP (Generic Attribute Registration
Protocol) to automatically distribute VLAN configuration information in a network. Each switch in a network needs
only to be configured with VLANs it requires locally. VLANs configured elsewhere in the network are learned
through GVRP. A GVRP-aware end station (i.e. PC or Intelligent Electronic Device) configured for a particular VID
can be connected to a trunk on a GVRP-aware switch and automatically become part of the desired VLAN.
When a switch sends GVRP bridge protocol data units (BPDUs) out of all GVRP-enabled ports, GVRP BPDUs
advertise all the VLANs known to that switch (configured manually or learned dynamically through GVRP) to the
rest of the network.
When a GVRP-enabled switch receives a GVRP BPDU advertising a set of VLANs, the receiving port becomes
a member of those advertised VLANs and the switch begins advertising those VLANs through all the GVRP-
enabled ports (other than the port on which the VLANs were learned).
To improve network security using VLANs, GVRP-enabled ports may be configured to prohibit the learning of any
new dynamic VLANs but at the same time be allowed to advertise the VLANs configured on the switch.
The following is an example of how to use GVRP:
Summary of Contents for RUGGEDCOM RX1510
Page 32: ...RUGGEDCOM ROX II User Guide Preface Customer Support xxxii ...
Page 44: ...RUGGEDCOM ROX II User Guide Chapter 1 Introduction User Permissions 12 ...
Page 62: ...RUGGEDCOM ROX II User Guide Chapter 2 Using ROX II Using the Command Line Interface 30 ...
Page 268: ...RUGGEDCOM ROX II User Guide Chapter 4 System Administration Deleting a Scheduled Job 236 ...
