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Server Load balancing with NAT, using Nexus switches: ITD

- October 30, 2015 - 1 Comment

Server load balancer (SLB) has become very common in network deployments, as the data & video traffic are expanding at rapid rate. There are various modes of SLB deployments today. Application load balancing with network address translation (NAT) has become a necessity for various benefits.

Cisco Intelligent Traffic Director (ITD) is a hardware based multi-terabit layer 4 load-balancing and traffic steering solution on the Nexus 5k/6k/7k/9k series of switches.

With our latest NX-OS Software 7.2(1)D1(1) (also known as Gibraltar MR), ITD supports SLB NAT on Nexus 7k series of switches.

In SLB-NAT deployment, client can send traffic to a virtual IP address, and need not know about the IP of the underlying servers. NAT provides additional security in hiding the real server IP from the outside world. In the case of Virtualized server environments, this NAT capability provides increased flexibility in moving the real servers across the different server pools with out being noticed by the their clients. With respect health monitoring and traffic reassignment, SLB NAT helps applications to work seamlessly without client being aware of any IP change.

ITD won the Best of Interop 2015 in Data Center Category.

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ITD provides :

  1. Zero latency load-balancing.
  2. CAPEX savings : No service module or external L3/L4 load-balancer needed. Every Nexus port can be used as load-balancer.
  3. IP-stickiness
  4. Resilient (like resilient ECMP), Consistent hash
  5. Bi-directional flow-coherency. Traffic from A–>B and B–>A goes to same node.
  6. Monitoring the health of servers/appliances.
  7. Handles unlimited number of flows.

Documentation, slides, videos:

Email Query or feedback:ask-itd@external.cisco.com

Connect on twitter: @samar4

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1 Comments

  1. In an age where we’re finally beginning to realize Software Defined Everything, and where software load balancers are currently providing near line rate (we’ve achieved near-line rate of 9.6Gbps on VMware based SDN) ... Cisco decides to jump back into the game of hardware based load balancers. At least this seems to be catered to the unmet needs of the huge market demand for multi-terabit load balancing ! Cue Bob Uecker asking if anyone is listening ... https://www.youtube.com/watch?v=Y9myYc8Pn8o

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