Comments
Cisco's SDN Strategy: 4 Critical Questions
Newest First  |  Oldest First  |  Threaded View
EtherealMind
50%
50%
EtherealMind,
User Rank: Ninja
1/21/2014 | 11:01:10 AM
Re: SDN !!!
MPLS has, and continues, to be a good technology but it does not have the capability to be managed by software remotely. MPLS is intended to be an autonomous and self-configuring system through the use of LDP and BGP. 

SDN really focuses on how we can impact the end to end data path. We need to change it daily or hourly. We need to add and delete configuration without risk. These are not things that MPLS/LDP/BGP can do today. 

Another issues is that MPLS depends on the capacity of the hardware to handle MPLS labels in memory. There is strictly finite TCAM capacity that limits the MPLS to relatively small number of paths. SDN works best with micro-flow management instead of macro-flow management of MPLS. 

The first phase of SDN will be in the data centre where we can control the entire system but the next generation will be in the WAN and SP Core. It will take a few years for the technologies to prove themselves but it will bring many new capabilties. 
jgherbert
50%
50%
jgherbert,
User Rank: Ninja
12/30/2013 | 12:44:42 PM
Re: SDN !!!
Well, and arguably MPLS was (or could be) software defined, through MPLS-TE providing different CoS to different traffic streams, and largely taking the decision making process out of the hands of the underlying network equipment and treating P routers as "dumb" switches for MPLS packets, while the intelligence was applied at the edge through policies defined either manually or, for many services providers, by way of automated provisioning (including re-routing and backup paths). Look at Cisco's ACI for comparison - using VXLAN to tunnel traffic across the ACI "backbone"; the intelligent decision is made at the edge (ingress) and the rest is just dumb switching. I see strong corelations between some aspects of SDN, at least, and MPLS. At least, that is, where you control the entire end-to-end flow (a problem with many SDN solutions right now).

 

Greg Ferro wrote about something similar recently -- http://etherealmind.com/overlay-networking-vxlan-means-mpls-in-the-data-centre-is-dead/

 

 
virsingh211
50%
50%
virsingh211,
User Rank: Apprentice
12/24/2013 | 3:49:57 AM
Re: SDN !!!
The only comparison here is that they both imply to network, my only point here was that we have been emphasizing on application based network but on other hand MPLS which was not application based ruled out perfectly and now running smoothly.
Susan Fogarty
50%
50%
Susan Fogarty,
User Rank: Strategist
12/23/2013 | 10:25:42 AM
Re: SDN !!!
Virsingh, do you think you could find the link to that blog? I don't quite understand the comparison between MPLS and using SDN to scale applications on the network. I thought the use of MPLS has been decreasing in favor of Internet-based networks.
virsingh211
50%
50%
virsingh211,
User Rank: Apprentice
12/23/2013 | 5:10:24 AM
SDN !!!
ACI is believed to  provide many of the same provisioning and virtualization features ,but hardware is the foundation of the technology, is hardware the answer ? I was reading across some blog and found a very relevant point, i.e. Application is getting good hype for scaling network if this is so important then how come we have been using MPLS.


Cartoon
Slideshows
Audio Interviews
Archived Audio Interviews
Jeremy Schulman, founder of Schprockits, a network automation startup operating in stealth mode, joins us to explore whether networking professionals all need to learn programming in order to remain employed.
White Papers
Register for Network Computing Newsletters
Current Issue
2014 State of Unified Communications
2014 State of Unified Communications
If you thought consumerization killed UC, think again: 70% of our 488 respondents have or plan to put systems in place. Of those, 34% will roll UC out to 76% or more of their user base. And there’s some good news for UCaaS providers.
Video
Twitter Feed