The scope of this standard is to define an architecture and bridge protocols compatible and interoperable with Provider Bridged(1) Network protocols and equipment allowing interconnection of multiple Provider Bridged Networks, to allow scaling to at least 2^20 Service VLANs, and to support management including SNMP.
IEEE 802.1ah-2008
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IEEE Standard for Local and metropolitan area networks — Virtual Bridged Local Area Networks Amendment 7: Provider Backbone Bridges