Summary

There are multiple reasons why Cisco has no reason to sell used networking gear. 
 
 

Analysis

Used networking gear would have to sell at a much lower gross margin than what new Cisco gear would sell for (60% or more).  Margin preservation is a high priority for Cisco.
 
Furthermore, a large theme of Cisco's business model is getting consumers to upgrade their networking gear, due to the new applications that faster technologies would enable (Cisco's telepresence videoconferencing for one).  Becoming a reseller in the aftermarket is a direct contradiction of this, and Cisco in fact would be actively opposed to a market for used networking gear gaining too much traction. 
 
Many metro-area networks (MANs) are overdue for upgrades, particularly in the United States, and Cisco stands to earn about $50 Billion in revenue during these upgrades.  The sooner that Cisco can sell customers on the need to upgrade, the better.  Used networking gear would merely be a distraction. 

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Analyses are solely the work of the authors and have not been edited or endorsed by GLG.