Cisco struck back against VMware’s No. 1 SD-WAN vendor claims today with a blog post touting its SD-WAN market leadership.

“Dell’Oro continues to place Cisco as the No. 1 in SD-WAN market share,” wrote Cisco VP Muninder Sambi. “Cisco was also just named a 2020 Gartner Peer Insights Customers’ Choice for WAN Edge Infrastructure.”

Sambi’s referring to a report Dell’Oro Group published in March that says the worldwide SD-WAN market grew 64% and surpassed the $1 billion level for the full year 2019. It ranks the five leading vendors, Cisco, Silver Peak, Versa, VMWare, and Fortinet, in that order and says they had a combined revenue share of almost 60% last year.

Cisco and VMware have been battling for SD-WAN superiority ever since the two vendors spent hundreds of millions of dollars to buy leading SD-WAN startups Viptela and VeloCloud in 2017. VMware paid $449 million for VeloCloud, and Cisco paid $610 million for Viptela.

Depending on which market share report you believe, either Cisco or VMware holds the top SD-WAN ranking.

In a November 2019 blog post, Cisco claimed 20,000 SD-WAN customers across its Viptela and Meraki product lines as of its first fiscal quarter of 2020. At the time VMware hadn’t disclosed its SD-WAN customer count. And it continued to stay mum on that number until yesterday when it disclosed more than 225,000 branch offices have deployed its SD-WAN. While this isn’t a direct apples-to-apples comparison — Cisco specifies customers while VMware uses branch offices — this didn’t stop VMware from claiming SD-WAN dominance over Cisco.

“We are the No. 1 vendor in SD-WAN,” said Tom Gillis, SVP and GM of VMware’s Networking and Security Business Unit. Gillis based this claim on IHS Markit’s fourth-quarter 2019 SD-WAN market report, Frost and Sullivan’s 2019 data, and Gartner’s latest Magic Quadrant for WAN Edge Infrastructure.

While Cisco’s blog doesn’t specifically call out VMware or any other SD-WAN competitor, it does note that Cisco offers “best in class software and hardware for SD-WAN.”

“Through our traditional hosted products and our Meraki lines, we support multiple deployment models,” Sambi wrote. “Cisco SD-WAN supports the broadest range of options for any location, including both physical and virtual, for the branch or remote office, and for clouds and colocations.”

VMware’s SD-WAN service includes its VeloCloud Edge appliance.