The move gives the US-based computer and enterprise solutions firm a stronger foothold in the over USD 18 billion campus networking solutions market.
The transaction is expected to close in the second half of HP's fiscal year 2015. The firm's fiscal year runs from November 1 to October 31.
The company in a statement today said it will acquire Aruba for USD 24.67 per share in cash.
"Equity value of the transaction is approximately USD 3 billion and net of cash and debt approximately USD 2.7 billion. Both companies' boards of directors have approved the deal," it added.
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Aruba and HP believe, that by combining complementary product portfolios and go-to-market approaches, they will be able to accelerate revenue growth and strengthen the financial performance of the combined HP Networking business and create a leading competitor in the USD 18 billion and growing campus networking sector, HP said.
Overall, HP expects the acquisition to be accretive to earnings in the first full year following close.
With this move, HP will be uniquely positioned to deliver, both innovation and global delivery and services offerings to meet customer needs worldwide, it added.