Shuang Yu. «IEEE approves new IEEE 802.1aq Shortest path bridging». IEEE Standards Association. Arxivat de l'original el 14 de maig 2013. [Consulta: 19 juny 2012]. «Using the IEEE’s next-generation VLAN, called a Service Interface Identifier (I-SID), it is capable of supporting 16 million unique services compared to the VLAN limit of four thousand.»
Shuang Yu. «IEEE approves new IEEE 802.1aq Shortest path bridging». IEEE Standards Association. Arxivat de l'original el 14 de maig 2013. [Consulta: 19 juny 2012]. «Using the IEEE’s next-generation VLAN, called a Service Interface Identifier (I-SID), it is capable of supporting 16 million unique services compared to the VLAN limit of four thousand.»