Characterizing VLAN usage in an operational network
Prashant Garimella, Yu-Wei Eric Sung, Nan Zhang, Sanjay Rao · 2007
In this paper, we present one of the first studies characterizing VLAN usage in a large operational network. Our study employs a "white-box" approach, based on analysis of switch and router configuration files, and interactions with network operators. Our findings are: (i) VLANs are extensively used to enable users at physically disparate locations to be treated as a group; (ii) the performance inefficiencies resulting from such usage is significant; and (iii) the inefficiencies are exacerbated by sub-optimal placement policies. Finally, we identify potential sources of errors that may arise with VLAN configurations, and demonstrate their prevalence.