Global spending on carrier infrastructure - including carrier Ethernet, IP and MPLS equipment - grew 27% in Q1, according to Synergy Research Group.
And the carrier Ethernet and service provider routing sectors experienced record growth as operators looked to expand their networks to support the explosion of video traffic.
Overall spending grew the most in Latin America, with 50% growth, followed by North America with 37% and emerging markets at 36%.
Cisco gained a record 7.26 percentage points of market share quarter-on-quarter, and was the world's biggest infrastructure vendor by revenue during the quarter.
Second-placed Juniper experienced strong growth in the Ethernet Services Edge router market, picking up nearly three points of market share.