Article: VPLS or PBT? Switch maker hammers out answer; * Hammerhead Systems' enhancements to its HSX 6000 switch.(Provider Backbone Transport)(Virtual Private Local Area Network Service)

Byline: Jim Duffy

Edge switch maker Hammerhead Systems last week announced enhancements to its HSX 6000 switch, including a "multiclass"

implementation of VPLS and support for Provider Backbone Transport (PBT).

Virtual Private LAN Service is a multipoint-to-multipoint Ethernet LAN service that makes corporate offices in metro areas

or across the country appear to be connected to the same LAN. It is based on MPLS technology, which service providers have

made considerable investment in over the past decade to engineer traffic on their networks and found new VPN service offerings.

VPLS is one such recent new service.

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