This Tues Cisco announced their new addition to the CRS family of core routers – the CRS-3 – billed as a 322 Terabit Router. This means it has over three times the capacity of the CRS-1 which has a maximum system capacity of 92 Tbps. A large percentage of the announcement was spent convincing us that the world needs a 322Tbps router – drawing on data from Cisco’s Visual Networking Index. Nobody’s arguing with Cisco on this point. Mobile data, video content, web-attached toaster, blah, blah blah – we get it. However, just as nobody is actually going to transmit the entire contents of the Library of Congress over the Internet in four minutes (although we will all sleep better knowing that they could), no one is going to string together 72 23 inch chassis, each three feet deep and over six feet high, to achieve the parlor trick of the 322 Terabit router. I’m not saying that we’ll never need a 322Tbps core router. I’m just saying that when we do – it’s not going to be delivered by the CRS-3. Let’s look for a moment at the CRS-1 – the 92Tbps router. Introduced in 2004, the CRS-1 also requires 72 racks to build out to its full 92Tbps capacity. However, while Cisco is keeping tight-lipped on this subject, Yankee Group believes that the vast majority of CRS-1s to be 1-5 chassis systems and we know of no systems over 10 chassis. By the time Cisco customers moved into the double digits of chassis – Cisco introduced the CRS-3 which could deliver three times the speed per chassis. In 3-5 years when CRS-3 implementations are, at most, in the low double digits – Cisco will introduce the CRS-5 or 7 or whatever catchy name the company comes up with. That leaves us with the existential question of: Is a router really 322Tbps if nobody ever implements the full configuration? It does, certainly, allow Cisco to boast the highest capacity core router. Juniper Networks currently boasts the highest capacity, currenlty shipping, core router on a per-chassis basis with its T1600, supporting 1.6Tbps in a single, half-rack chassis. With the introduction of a 100Gbps slot, the CRS-3 will support support 4.5Tbps per (full rack) chassis. Juniper is expected to introduce a 250Gbps slot in 2011. Will the CRS-3 begin production shipment before Juniper ships the 250Gbps per slot systems? Probably – we expect Cisco to be able to claim fastest per chassis system for up to 12months, after which Juniper will reclaim that title until Cisco ships a 250Gpbs slot.
But enough of speeds and feeds. The most intriguing aspect of the announcement for me was the introduction of Cisco’s Data Center Services System (DCSS), linking information about the network with data center intelligence in order to improve overall performance and customer experience. The Network Positioning System (NPS) capability of the DCSS uses layer 3-7 network information to load balance content across multiple data centers and provide the best path to that content. The Cloud VNP for IaaS capability uses information from both the CRS IOS-XR network operating system and the NEXUS NX-OS for the data center to achieve the “pay-as-you-go” promise of cloud computing from a compute, storage and network perspective. It locates needed compute and storage resources and balances the workload to relieve strained resources. Sounds great – I’ll be looking forward to seeing implementations of these capabilities. They are certainly what are needed to achieve the cloud computing end-game. These solutions currently depend upon Cisco in the network with the CRS and Cisco in the data center with Nexus. In my conversation with Cisco they hastened to emphasize that they are working in the standards committees to craft standard versions of the protocols involved – ones that they hope will look a lot like Cisco’s. Knowing how the standards groups work – we would not expect to see anything out of the IEEE or the IETF for at least 18 to 24 months.
So, kudos to Cisco marketing – they surely know how to get us all to listen. But the bottom line from my perspective? - a lot of hoopla, some slight-of-hand, and what looks to be some cool software – which is, after all, what Cisco is best at.




