Abstract
Basic components of Provider Backbone Bridge (PBB) network models were constructed: PBB interior switch, PBB edge switch—with the dynamic filling up of address tables. The modeling of PBB networks was implemented. The results of simulation reveal definite imperfections of PBB technology caused by the broad-casting and sensitivity to the ageing time of the address tables’ records, which complicates the guaranteeing of a given QoS. The preliminary comparison confirms definite advantages of E6 addressing before PBB.
Highlights
Technology of Provider Backbone Bridge (PBB) [1] is aimed to the construction of networks entirely on the base of Ethernet
The results of simulation reveal definite imperfections of PBB technology caused by the broadcasting and sensitivity to the ageing time of the address tables’ records, which complicates the guaranteeing of a given QoS
The preliminary comparison confirms definite advantages of E6 addressing before PBB
Summary
Technology of Provider Backbone Bridge (PBB) [1] is aimed to the construction of networks entirely on the base of Ethernet. Corresponding standard IEEE 802.1ah [2], which development was started in 2005 has been prepared in a draft variant, while companies have already started the issuing of PBB switches and providers have started their exploiting. With the advent of 1 Gbps and 10 Gbps Ethernet standards, new opportunities of Ethernet technology mass employment in provider backbone networks have been opened, but 802.3, 802.1D technology has a series of disadvantages regarding scalability, quality of service, manageability, which a new series of IEEE standards were developed to overcome: 802.1Q—virtual networks, 802.1QinQ—multilevel virtual networks, 802.1ad—provider bridges, 802.1ah—backbone provider bridges, 802. Mentioned standards provide the Carrier Ethernet concept to substitute SDH, as well as IP-MPLS solutions in backbone networks, though IETF undertakes active attempts of MPLS and PBB standards integration in virtual private service VPLS [3]
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