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Cisco’s IWAN (Intelligent WAN) for Your SD-WAN
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The company I work for, NetCraftsmen, is seeing increasing levels of consulting customer interest in Cisco IWAN. That reflects either tech cool-ness or cost-savings — or both! In a recent blog , I discussed some considerations for those intrigued by the idea of SD-WAN. For organizations with a Cisco WAN in place already, the risk and cost to try out IWAN may be low. Using application-aware technology such as PfRv3, sensitive traffic can be shifted off poorly behaving internet links. Putting all that together, there might be real cost savings if you use a couple of different ISPs and traffic shifts when one of them is having a bad day. Another alternative is to send most traffic over the internet path, VoIP, and sensitive traffic over MPLS, with failover to the other path if conditions turn bad. The heavy lines indicate DMVPN encrypted tunnels, one for the MPLS side, and another for the internet side. Each provides secure encrypted any-to-any connectivity between the branches and the hub. The PfRv3 shifts traffic between the two paths up to five paths. I recently had the chance to put in some extended lab time working with PfRv3, and almost all aspects worked as expected. This is worth noting, since PfR versions 1 and 2 had some rough spots. Since then, Cisco appears to have massively redesigned how PfR v3 works, put in a lot of smart engineering, and done solid testing. There have also been some simplifications, which helps too. But would you really want to have to manage that complexity? The QoS is pretty much the same QoS we all have been doing. CiscoLives, and the currently recommended approach to WAN QoS. One can deploy it incrementally: I see that as mitigating risk, or as letting sites incrementally deploy additional features based on their comfort level, staff time, etc. With a consultant helping, knowledge transfer might be a related gating factor. As noted in this blog , I discussed some considerations for those considering intrigued by the idea of SD-WAN. There are a couple of items that tilt the playing field in favor of Cisco IWAN for many organizations:. One place where sunk equipment costs might not come into play is where the customer has connected a MetroEthernet service directly to a firewall or Layer 3 switch. We do generally advise against doing that. Firewalls and switches do not support QoS traffic shaping to the contracted speed. So some sites may not be ideal candidates for IWAN, due to not having the prerequisite routers in place. The cost for a couple of routers for a pilot project need not be all that high, however. Alternatively, many Cisco Partners should be able to support IWAN by now. NetCraftsmen would be glad to talk to you about that. My personal inclination for deployment in brownfield is to do it manually, for better control, router by router. Your preferences may vary. Or some other mix? And how smoothly that can be done. Right now, manual IWAN deployment templates, not that bad gives me the control I want. When in doubt, check out the Cisco Validated Design CVD document. There are two fresh PDFs, as of October I enjoy hearing from readers and carrying on deeper discussion via comments. To earn points and badges for participating in the conversation, join Cisco Social Rewards. Your comment s will appear instantly on the live site. Spam, promotional and derogatory comments will be removed. Hi Pete, Thanks for blogging. There are some newer CVDs available here: Thanks Daniel, especially for the fresher link. This blog was first drafted in late March or so, and when reviewing the final draft last week I failed to think to look for fresher CVD content. And see you at CiscoLive! Some of the individuals posting to this site, including the moderators, work for Cisco Systems. 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Asia Pacific Austria Belgium Dutch French Canada English French. Finland France Germany Greece India Italy Japan. Korea Latin America Latin America Esp Cansac Netherlands Norway Poland. Daniel Dib June 12, at Peter J Welcher June 13, at 7: Get credit for all your Cisco site participation with Social Rewards.
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