Cisco Aggressively Ups Its SD-WAN Game
Pluribus did a nice job presenting at #NFD16. Their product was new to me. I’m a structured knowledge kind of guy, so I’ve been trying to figure out where to fit them into my mental schema.
The high level is easy: fabric management products. The two leading ones are Cisco’s ACI and VMware NSX. Both are controller-based. Both can do policy. Apstra: controller, no policy.
Both ACI and NSX do VXLAN, but the approaches to VXLAN do not interoperate. I’d describe both their approaches as controller-based VXLAN tunneling over an L3 underlay — they don’t interoperate because there’s an issue of who’s in control and tracking VTEP/MAC address information. To me, the key is ARP or equivalent, and how the fabric knows where a device is located — as in which port on which VTEP (VXLAN tunnel endpoint).
Contrast Cisco VXLAN/EVPN, which has no controller but does MAC/IP learning via MP-BGP. Apstra: not clear. Do they do BUM forwarding or anycast gateway? I haven’t run that information down yet.
So now we have a framework to try to fit Pluribus into. Hopefully no folding, spindling, or awkwardness involved. Let’s get to the subject of this blog (at long last?).
Pluribus Netvisor OS is a bit different from those just mentioned. It apparently used to be Solaris-based, and has pivoted onto Linux. Netvisor is controller-less, running in distributed form on white box switches, OpenCompute/ONIE-compliant. Switches supported include Dell EMC, Edgecore, Pluribus Freedom switches, and now D-Link.
To emphasize the distributed nature of Netvisor: You can issue CLI commands on any switch and they apply across the fabric of switches. Unlike some fabrics, you just need routing reachability for control, not, for example, dedicated management ports for the control network. So you can use Netvisor to control a bunch of leaf switches, and separately or not control the spine switches.
Pluribus thus gets points from me, for recognizing that we need to manage the fabric as one large switch, and get away from managing individual devices.
Netvisor tracks attached devices, via the vPort mechanism (virtual port). I suspect each switch learns what’s attached, and they either communicate that or have a way to query each other. My notes say “conversational forwarding, no broadcasts,” so I suspect the latter (query approach) applies. Although with ACI, you’d query the MAC/IP database – with Pluribus, is it a query to all the distributed database elements?
The fabric apparently auto extends to fabric-attached VMware ESX server clusters — vCenter integration with “seamless orchestration.”
Netvisor creates virtual network containers on the switches, each with its own virtualized router, providing segmentation. This leads to the “Adaptive Cloud Fabric.”
Netvisor is positioned for the datacenter, or racks/pods, or hyper-converged infrastructure, e.g. Nutanix, vSAN (vSAN aware), VxRail. It can now operate as an NSX hardware VTEP L2 gateway.
Pluribus talks about pervasive visibility into all traffic, all ports, without dedicate probes, with the ability to monitor TCP connections. That can feed into Pluribus’ Insight Analytics and VirtualWire services. All that sounded flow-centric to me, which is OK — but to me, NetFlow or Flow metadata is somewhat secondary to per-port data as problem indicators. I didn’t hear whether Pluribus can stream or otherwise collect or provide per-port bytes, packets, errors, discards type data as well — time constraints, etc. I suspect the vPort scheme collects some statistics — but how do I capture them over time, etc.?
Pluribus documentation requires a login. (I went to look for what third party switches are supported, can’t readily find that info. I did find the marketing page for which vendors. Short list.)
Bzzt, that costs points. I think vendors should (must!) provide open access to their documentation. Anything else defeats Google search, which (a) slows me down, which loses you points, and (b) is usually a heck of a lot better than whatever each vendor uses for indexing. Sigh.
As far as market niche, it seems like Pluribus fits as either an underlay controller for VMware, or for use with VMware in a fabric with significant remaining physical server presence. As with any multi-vendor product, support for any vendor’s switch depends on both the hardware and software versions being supported. Continuing support might be another consideration.
There’s some complementary information in a couple of the earlier #NFD16 blogs:
Comments are welcome, both in agreement or constructive disagreement about the above. I enjoy hearing from readers and carrying on deeper discussion via comments. Thanks in advance!
Cisco Aggressively Ups Its SD-WAN Game
No, It’s Not Optimus Prime
About Network Design Principles
Virgilio “Bong” has sixteen years of professional experience in IT industry from academe, technical and customer support, pre-sales, post sales, project management, training and enablement. He has worked in Cisco Technical Assistance Center (TAC) as a member of the WAN and LAN Switching team. Bong now works for Tech Data as the Field Solutions Architect with a focus on Cisco Security and holds a few Cisco certifications including Fire Jumper Elite.
John is our CTO and the practice lead for a talented team of consultants focused on designing and delivering scalable and secure infrastructure solutions to customers across multiple industry verticals and technologies. Previously he has held several positions including Executive Director/Chief Architect for Global Network Services at JPMorgan Chase. In that capacity, he led a team managing network architecture and services. Prior to his role at JPMorgan Chase, John was a Distinguished Engineer at Cisco working across a number of verticals including Higher Education, Finance, Retail, Government, and Health Care.
He is an expert in working with groups to identify business needs, and align technology strategies to enable business strategies, building in agility and scalability to allow for future changes. John is experienced in the architecture and design of highly available, secure, network infrastructure and data centers, and has worked on projects worldwide. He has worked in both the business and regulatory environments for the design and deployment of complex IT infrastructures.