The virtual network infrastructure company Plumgrid announced last week that it was raising a $17.2 million round of venture capital funding.

The company filed a document with the Securities and Exchange Commission today indicating that it has now raised $16.2 million of the total.

Longworth Venture Partners led the Series new round, with participation from U.S. Venture Partners, Hummer Winblad Venture Partners, Qualcomm Ventures and Swisscom Ventures.

The company’s product, the PLUMgrid OpenStack Networking Suite, is a cloud networking infrastructure for OpenStack clouds. The software-only product is designed using a distributed architecture to scale to multi-rack or geographically distributed OpenStack deployments, according to the company.

The suite also includes built-in monitoring, analytics and troubleshooting tools.

Plumgrid raised $10.7 million in its first round of funding back in August 2012.

Sunnyvale, California-based Plumgrid has now taken a total of $29 million in venture funding.