Broadcom released some information about the new Tomahawk II chip last week in a press release. For those who follow hardware, there are some interesting points worth considering here.
First, the chip supports 256x25g SERDES. Each pair of 25G SERDES can be combined into a single 50g port, allowing the switch to support 128 50g ports. Sets of four SERDES can be combined into a single 100g port, allowing the switch to support 64 100g ports.
Second, there is some question about the table sizes in this new chip. The press release notes the chip has “Increased On-Chip Forwarding Databases,” but doesn’t give any precise information. Information from vendors who wrap sheet metal around the chipset to build a complete box don’t seem to be too forthcoming in their information about this aspect of the new chip, either. The Tomahawk line has long had issues with its nominal 100,000 forwarding table entry limit, particularly in large scale data center fabrics and applications such as IX fabrics. We’ll simply have to wait to find out more about this aspect of the new chip, it seems.
Third, there is some question about the forwarding buffers available on the chip. Again, the Tomahawk Continue reading
Facebook is back in the news again. This time, it’s because of the release of their new Wedge 100 switch into the Open Compute Project (OCP). Wedge was already making headlines when Facebook announced it two years ago. A fast, open sourced 40Gig Top-of-Rack (ToR) switch was huge. Now, Facebook is letting everyone in on the fun of a faster Wedge that has been deployed into production at Facebook data centers as well as being offered for sale through Edgecore Networks, which is itself a division of Accton. Accton has been leading the way in the whitebox switching market and Wedge 100 may be one of the ways it climbs to the top.
Wedge 100 is pretty impressive from the spec sheet. They paid special attention to making sure the modules were expandable, especially for faster CPUs and special purpose devices down the road. That’s possible because Wedge is a highly specialized micro server already. Rather than rearchitecting the guts of the whole thing, Facebook kept the CPU and the monitoring stack and just put newer, faster modules on it to ramp to 32x100Gig connectivity.
As suspected in the above image, Facebook is using Broadcom Tomahawk as Continue reading