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1. IN372/DELNP/2007 - SCALING VLANS IN A DATA NETWORK

Office
India
Application Number 372/DELNP/2007
Application Date 15.01.2007
Publication Number 372/DELNP/2007
Publication Date 03.08.2007
Grant Number 257778
Grant Date 08.11.2013
Publication Kind B
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
Applicants CISCO TECHNOLOGY, INC
Inventors ANUSANKAR ELANGOVAN
Priority Data 10888866 09.07.2004 US
Title
(EN) SCALING VLANS IN A DATA NETWORK
Abstract
(EN) A technique for scaling virtual local area networks (VLANs) in a manner that allows existing standards to be used to process VLAN traffic and provide loop-free topologies for the VLANs. A data network is divided into customer, domain and core networks. VLANs are apportioned between the core nctw;ork and domain networks such that VLANs apportioned to the core networks are global to both the core and domain networks and VLANs apportioned to the domain networks are local to each domain. Packets transported in the domain network contain domain VLAN (DVLAN) lags which are conventional VIDs that identify VLANs used to transport thc packets in the domain network. Packets transported in the core network contain transport VLAN (TVLAN) tags which are conventional VIDs that identify VLANs used to transport the packets in the core network. In addition, packets transported in the core network contain pseudo-LAN (P-LAN) tags that are used in combination with TVLAN tags to identify DVLAN lags associated wilh the packet.
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