From their March peak, Cisco shares have fallen 40 percent.

Cisco shares rose 61 cents, or 3 percent, to $20.20.

Today Cisco shares rose $1.12, to $20.37, the highest close in seven weeks.

Cisco shares rose as much as $4.875 to touch an all-time high of $93.75.

Short sales of Cisco shares rose to 27.3 million, from 21.4 million.

Cisco shares ended the day at $16.65, down just 3 percent.

Cisco shares closed at $65.50, down 75 cents, in Nasdaq trading.

Cisco shares have more than doubled over the last year.

Cisco shares closed at a 52-week low of $20.63 on Friday, down $2.19 or nearly 10% on the day.

Cisco shares rose $4.125, or about 6 percent, to close at $67.75 in Nasdaq trading.