What Kind of Design?

In this short video I work through two kinds of design, or two different ways of designing a network. Which kind of designer are you? Do you see one as better than the other? Which would you prefer to do, are you right now?


  1. hemanth raj on 26 September 2017 at 8:23 am

    Hi russ

    As you said devices , configurations and services are the three different components in network engineering.
    Devices are picked based on their offerings on services, speed and its scalability ,( breakout options ) , memory architecture ( packet buffer & control plane protected memory ) , hardware architecture such tcam acl,fib,qos,pbr and loads sharing architecture. Fabric backplane over subscription ratio , and set of features licensed with base or enterprise or data centre. Power, fan , system alarms , leds ,phyless or phy for power , space ( 1 Rack unit or more ) , fixed or modular chassis, separate service card for tunnelling services such as IPSec , GRE , Vxlan services on the hardware itself.

    Managing device services such as snmp mibs , other ways such as latency analyser tools inbuilt on the device software,

    Scalable linux based software , reload capable facilities , wire rate throughput ,
    Feature scalability.

    Flow characterisation visibility on the devices.

    I will pick the best of both worlds such as devices and its use cases , chipset , single or multi chipset architecture , workload f the device ,
    Services scaling n its configuration ease will also come handy

  2. hemanth raj on 26 September 2017 at 8:42 am

    Traffic through or to the device and different points of traffic in the network or within the system, interaction planes within system using ipc messages are also part of the system characteristics.
    What are the services and how does the services traffic flow inside the device also counts.

    Service architecture inside system matters most and life of the packet for data plane and service plane counts here.

    Service implementations inside the system also matters .

  3. hemanth raj on 26 September 2017 at 8:51 am

    As per the security services such as dpi , firewall services , we usually rely on offloading security services from forwarding plane routers .
    We have added layer of security at the edge such as A10 devices that specialise in the traffic filtering, dpi , firewall services and .

    Forwarding tiers and security tiers at the edge entering and leaving dc/ edge data centres matters .

    Forwarding plane devices in each tier has its own characteristics and workload of each tier device also matters.
    Tor device requires more memory b.w features compared to fabric/core forwarding device requires more fib tcam space and intra system switching speed.

    Core design requires faster switching predominantly MPLS switching.

    Design comes in various layers and each layer requires its own characteristics and workload of the device and speed and volume of traffic .

  4. hemanth raj on 27 September 2017 at 8:48 am

    Another point to add is that dedicated service cards such as multi service cards which is dedicate don’t used for IPSec encryption decryption and encapsulation such as cisco 4351 sm module and integrated service card which performs IPSec on the h.w which doesn’t have any redundancy . Choosing the h.w depends truly on the service layer throughput and also the port ranges it can support.

    Services + speed + configuration ease + redundancy in cards helps make a better choice.

    Headroom for expansion on service card/ backplane fabric and also modular/ fixed card chassis .