Solved

Suggestions for accurate speedtest when link is using CEF

Posted on 2006-10-19
7
391 Views
Last Modified: 2010-03-17
I have a circuit provided by a huge ISP that is 4 T1s bound using CEF (Cisco Express Forwarding).  When using www.speedtest.net this circuit does not show the 6Mbps throughput that we would expect.  Another vendor's circuit using MLPP for 4 bound T1s is showing 6Mbps throughput.

Is there an online test that will show the accurate results for the CEF circuit?

If you know this or can point to information, I'd be appreciate too:
Is there some problem with the way CEF works that would not provide a fully bonded circuit at the higher speed?
0
Comment
Question by:nummagumma2
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
7 Comments
 
LVL 79

Assisted Solution

by:lrmoore
lrmoore earned 200 total points
ID: 17770156
I would not expect CEF load balanced links to provide anywhere near the 6Mb download speeds you might expect.
The CEF default is to load-balance per connection. No one connection will get more than 1 T1 bandwidth.
You can switch to per-packet on an interface by interface basis, but you still won't get that high download speeds you think.
An MLPPP llink appears to the router as one big fat pipe and acts the same way. With MLPPP you can actually get those higher download speeds, but it is more CPU intensive.
0
 
LVL 12

Accepted Solution

by:
pjtemplin earned 300 total points
ID: 17773217
I pretty much echo what lrmoore said, but think you should be able to get rather close to 6Mbps with per-packet.

But the more important thing here is this: TELL US WHAT RESULTS YOU ARE GETTING!  Are you getting 1.5Mbps?  Are you getting 3Mbps?  Are you getting 149.6kbps?
0
 
LVL 1

Author Comment

by:nummagumma2
ID: 17775346
Duh. =)

The speedtests show something like 3Mbps down and 1.2 up, a far cry from the 6/6 I'd expect.  It looks like a DSL connection, albeit a far more robust solution.

Thanks for the comments so far.
0
Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

 
LVL 12

Expert Comment

by:pjtemplin
ID: 17775840
For giggles, can you do two speed tests at the same time, and see if you then get >3Mbps down and >1.2Mbps up?

Getting 3Mbps may indicate that they have per-packet forwarding enabled on their end.
0
 
LVL 1

Author Comment

by:nummagumma2
ID: 17775934
I've been told they are using per-packet forwarding, but I don't know what that means in terms of the overall speed that I'd be getting.  It sounds like you do... is there some reading I can do on this?
0
 
LVL 12

Expert Comment

by:pjtemplin
ID: 17776103
0
 
LVL 1

Author Comment

by:nummagumma2
ID: 18025026
Thanks guys.  I learned from speedtest.net that they don't support speed tests on CEF - and that what you both said was true - CEF will show maximum throughput of less than the combined speed due to the way it deals with packets.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

    Over the past few years, small business and home owners have become so dependent on internet that a need for redundancy has arisen.    What happens when your small business or home / home office loses its internet connection?  The results c…
This solves the problem of diagnosing why an internet connection is no longer working. It also helps identify the likely cause of the lost connection if the procedure fails to re-establish your internet connection. It helps to pinpoint the likely co…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question