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1. US20060007939 - Scaling VLANs in a data network

Office
United States of America
Application Number 10888866
Application Date 09.07.2004
Publication Number 20060007939
Publication Date 12.01.2006
Grant Number 7672314
Grant Date 02.03.2010
Publication Kind B2
IPC
H04L 12/28
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
28characterised by path configuration, e.g. LAN or WAN
H04L 12/56
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
54Store-and-forward switching systems
56Packet switching systems
CPC
H04L 12/465
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
28characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
46Interconnection of networks
4641Virtual LANs, VLANs, e.g. virtual private networks [VPN]
4645Details on frame tagging
465wherein a single frame includes a plurality of VLAN tags
Applicants Cisco Technology, Inc.
Inventors Elangovan Anusankar
Agents Cesari and McKenna, LLP
Title
(EN) Scaling VLANs in a data network
Abstract
(EN)

In one embodiment, a technique for processing data packets in a data network comprising a plurality of virtual local area networks (VLANs) is disclosed. A data network is divided into a core network and a plurality of domain networks, each domain network coupled to one or more customer networks. A plurality of VLANs are apportioned between the domain networks and the core network. The VLANs that are allocated to the domain networks are local to each domain network. However, the VLANs allocated to the core network are global to the domain networks and core network. When a data packet is acquired at a domain ingress edge node in a particular domain network, the node generates a domain network packet from information contained in the data packet. The node then tags the domain network packet with a domain VLAN (DVLAN) tag associated with a VLAN allocated to the domain network.