VLAN IDs assigned to LAN Ports should not overlap in case the operator wants to
ensure Layer-2 security between those LAN Ports (in many applications, LAN Ports
are likely to be dedicated to one customer). It is the responsibility of the operator to
define appropriately non-overlapping VLAN IDs on all the created virtual switches.
Also the provisioned PVID, with which untagged incoming frames are tagged, should
not overlap with any VLAN ID on the virtual switch of which the customers’ port is
part (again, this is the responsibility of the operator). Manual provisioning of
intermediate nodes can be cumbersome and difficult. Therefore it is recommended to
use the auto-provisioning mode for VLAN ID’s on the intermediate nodes. A protocol
named GVRP (GARP VLAN Registration Protocol) provides this functionality. GVRP
is an application of the Generic Attribute Registration Protocol (GARP) application,
which runs on top of the active spanning tree topology.
IEEE 802.1Q defines two kinds of VLAN registration entries in the Bridge Filtering
Database: static and dynamic entries. In the TransLAN
®
implementation, static entries
need to be provisioned on access node LAN ports only. GVRP will take care of
configuring dynamic entries on the WAN ports of intermediate and access nodes.
A spanning tree per virtual switch is implemented. If the user wants the traffic to be
protected by the spanning tree protocol and uses the manual-provisioning mode, he
must make sure that the WAN ports in the alternative path also will have the
corresponding VLAN IDs assigned. E.g. in a ring topology, all NE’s in the ring must
VLANs 1 to 20
Customers Access Site
VLANs 1 to 10VLANs11 to 20
V C -N -X v
to/from
ISP Router
ISP Premises/Site
FE or GbE interface
VLAN 1 to 10 = VLAN List of customer A
LAN
WAN
VLANs 1 to 10VLANs11 to 20
Customers Access Site
VLAN11to20=VLANListofcustomerB
V C -N -X v
VLAN trunking
Customer A's + customer B's traffic
Network Element
Network Element
Network Element
LAN
WAN
WAN
LAN
Traffic provisioning
Operational modes
....................................................................................................................................................................................................................................
8-66
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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