Search /
Advanced search  |  Help  |  Site map
Click for Layer 8! No, really, click NOW!
Networking for Small Business
Report: US FCC to allow payments for speedier traffic
China working on Linux replacement for Windows XP
FCC adds $9 billion to broadband subsidy fund
Raspberry Pi alternatives emerge to fill need for speed
It's now possible to wirelessly charge 40 smartphones from 16 feet away
Ex-FCC commissioner to head CTIA in latest Washington shuffle
Go time traveling with Google Maps
While Heartbleed distracts, hackers hit US universities
Survey respondents shun much-hyped mobile shopping technologies
Survey respondents shun much-hyped mobile shopping technologies
7 Ways to Advance Your Project Management Career
How Apple's billion dollar sapphire bet will pay off
US to vote on sharp increase in broadband subsidies
iPhone 6 rumor rollup for the week ending April 18
NSA spying revelations have tired out China's Huawei
Arista co-founder may have switch maker by its jewels
Apple kicks off public OS X beta testing
Open source pitfalls – and how to avoid them
AT&T's expanded 1 Gbps fiber rollout could go head to head with Google
BlackBerry Releases BES 10 Security Update to Address 'Heartbleed' Flaw
Verizon: Web apps are the security punching bag of the Internet
Cisco announces security service linked with new operations centers
Dell launches virtual storage accelerator, aims to boost SAN performance
Free OS X Mavericks now powers half of all Macs

Where should traffic shaping occur?

Related linksToday's breaking news
Send to a friendFeedback

Sign up to receive this and other networking newsletters in your inbox.

Vendors are adding traffic management and shaping capabilities to various network components to help network managers meet service-level agreements with their internal users. These capabilities are attracting closer scrutiny, as co-existing, networked applications with different behaviors become numerous and some start to take greater priority in user organizations than others.

There are three logical places on an enterprise's premises for such traffic management to take place: in the router, in a separate device on the LAN side of the router, and in a separate device on the WAN side of the router (such as an intelligent DSU/CSU).

At first blush, the router might seem the best place to do the job, because it uniquely has a view of both LAN and WAN traffic. Then again, router real estate is expensive, and it would seem that the router has plenty of important tasks to handle without consuming valuable CPU cycles for traffic shaping. Consequently, we are seeing adjunct tools becoming available on both the LAN and WAN sides of the router.

LAN-based traffic-management tools preprocess the traffic before it reaches the router, leaving the router to do what it does best: determine best paths through a network from source to destination, and forward packets. On the plus side, LAN-based traffic shapers see all, outbound traffic and thus make decisions based on the " whole picture. " The downside is that in this scenario, there is little explicit data about congestion available from the WAN. The best information that gets through is TCP window size information.

We'll take a look at WAN-side traffic-shaping pros and cons next time.



Steven Taylor, consultant and broadband packet evangelist, and Joanie Wexler, an independent networking technology editor and writer, team up to bring you this analysis and commentary. Taylor specializes in education and market analysis, and Wexler adds incisive reporting and research. For more detailed information on most of the topics discussed in this newsletter, connect to, the first Web site dedicated exclusively to market studies and technology tutorials in the Broadband Packet areas of Frame Relay, ATM, and IP.

Feedback and additional topic ideas are welcome. Please contact or

Frame Relay archive
Past newsletters.

Robbing Peter to pay Paul
Network World on Frame Relay newsletter, 12/20/99

NWFusion offers more than 40 FREE technology-specific email newsletters in key network technology areas such as NSM, VPNs, Convergence, Security and more.
Click here to sign up!
New Event - WANs: Optimizing Your Network Now.
Hear from the experts about the innovations that are already starting to shake up the WAN world. Free Network World Technology Tour and Expo in Dallas, San Francisco, Washington DC, and New York.
Attend FREE
Your FREE Network World subscription will also include breaking news and information on wireless, storage, infrastructure, carriers and SPs, enterprise applications, videoconferencing, plus product reviews, technology insiders, management surveys and technology updates - GET IT NOW.