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Tag Archives: Cisco

Enhanced Routing and QOS Models using Software Defined Networking

Quality of service implementations that utilize Integrated Services (IntServ) provides end-to-end service guarantees to IP traffic traversing campus networks. IntServ allows applications to signal their QOS requirements to the network while providing strong guarantees to individual traffic flows from sender to receiver,however IntServ quality of service architectures require all routers to implement a reservation protocol and maintain state information for all flows.

Computation of routes and the maintenance of states requires copious amounts of RAM and Processing power in order to scale to support large route and flow tables. Routers and switches built on merchant Asic are typically equipped with a limited  amounts of ram and processing power when compared to the typical X86 computer. The price of multi-core CPUs and DDR memory modules are at an all time low and this reality should allow the development of  a x86 based SDN controller that will be able to incrementally store router flow and link states.

Signaling:

SNMP or NETFLOW could be used to measure various constraints such as bandwidth,latency and delay. The values measured could be used to perform constrained shortest path route calculations for each node and also to modify route or congestion management characteristics on a per interface basis. 

 

 
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Posted by on August 7, 2013 in Uncategorized

 

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Building a Vmware Powered Hybrid Cloud using Ecalyptus

The Cloud means many things to many different persons,but personally I view a Cloud as a distinct pool of  computing resources that can be manage centrally, provides the ability to scale resources via pre configured policies and lastly provides the ability to automate manual requests such as Virtual Machine creation and deployment.

Though not recommended by many IT professionals, I am planning on making our IT department an internal service provider. In this vain it is my vision to build out a Private Cloud that can provide self service to authorized internal clients such as our developers and application administrators.Currently we utilize a Vmware Vsphere platform, but in another few months this platform will possess all the attributes of a true cloud.To provide the functions necessary I have decided that we will look at the Open Source Eucalyptus platform.

Eucalyptus is Open Source so it reduces our initial capital expenditure ,it is compatible with Vmware and it has the ability to support Amazon based workloads thus providing a Hybrid platform mangement tool.

At Stage one, we will roll out a Private Cloud  that will allow authorized internal clients to perform various tasks related to a an assigned blocked of computing resources.

At Stage two we will seek to allow the migration of workloads between Amazon and our Vmware based private cloud,this should provide Disaster recovery and scalability benefits to our group.

 

 
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Posted by on December 5, 2012 in Technology

 

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Looking at Dell Force 10

Dell has hit a home run with their force10 line. Born in the world of high frequency trading, Force10 with its huge output buffer provides Dow Jones, twitter and Facebook with low latency switching infrastructures. At prices lower than the nexus line and providing a command line that is syntactically similar to Cisco’s IOS. Force10 represent bridge to a hybrid network where Cisco IOS and force10 FTOS in concert with open standards such as lldp and gvrp gives the enterprise the ability to ensure that we receive the best features at the lowest pricepoints.

 
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Posted by on September 14, 2012 in Technology

 

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Multicast Application Design

Multicast is used to distribute data from one source to many receivers.These receivers normally are executing an application which in its underlying logic has joined a multicast group which is essentially a ip address that is able represent multiple nodes on a network. Public multicast ip addresses are rarely available to network managers or application dev teams hence applications should be developed to accept multicast ip address and port information in its initializtion code. This approach allows an application to be ip address agnostic and and allows the app to join any available multicast address

 
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Posted by on August 29, 2012 in Uncategorized

 

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Nexus 7000 Virtual Data Centers

Virtual data centers allows enterprises and Service providers to create truly distinct DCs that overlay a single physical infrastructure.The Cisco nexus provides the ability to virtualize all three planes namely the control,forwarding and management planes. For enterprises the ability to create logical virtual networks for testing purposes can provide significant cost savings since the need to buy test equipment is eliminated.

 
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Posted by on August 6, 2012 in Uncategorized

 

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My Software Defined Networking Wishlist

The primary goal i would be seeking to meet when i decide to implement Open Flow or some other SDN framework is management simplicity.Below i have listed two things that i hope SDN will address when it becomes main stream in enterprises.

Automatic VLAN Grafting

Connectivity issues resulting from the absence of Vlans on trunk links is a common problem that network techs face when provisioning access ports.SDN can be really valuable if it is able to graft vlans to trunk links based on learnt layer two traffic flow.

Advanced Optimized Edge Routing that integrates QOS

Currently OER/PFR is unable to implement QOS policy decisions on flows that are not operating within a certain threshold. An OPEN FLOW controller that implements QOS policies while managing policies below edge devices such as those in the network core would greatly enhance policy based routing design and overall network architecture design.

 
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Posted by on June 23, 2012 in Technology

 

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DATA CENTER + SDN EQUALS TRUE VIRTUAL NETWORKS

Multi Tenant data centers being used to provide cloud services has led to a number of network requirements that are difficult to meet using VRF, Q-In-Q or other tunneling techniques.A Cloud data center customer needs to be able to provision network resources such as virtual switches and RFC 1918 IP addresses  without needing to consider similar resources being used by other tenants. Software Defined networking seeks to provide an END-to-END virtual network that consists of virtual forwarding tables ,virtual routers,virtual switches and controllers.  Software Defined Networking can be used to create logical networks that consist of virtual network gear. SDN tracks the state of the underlying physical data center network along with the overlaying virtual networks.

State changes are recorded and the Physical or Logical components affected by these said state changes are configured to have their settings and operations updated to support the changes made by the data center’s customer. Software defined networking’s ability to provide distributed,rule driven control of large physical network elements presents a new way of virtualizing network resources.

 

 
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Posted by on June 13, 2012 in Uncategorized

 

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