01-17-2015 09:59 AM - edited 03-05-2019 12:35 AM
I have what I am sure is a simple question, but after reviewing the documentation, I just want to be sure: I have two internet connections coming into my 2921. One is a 50/50 symmetrical connection, the other a 100/20. If I want the router's load balancing logic to work correctly, how do I set the download/upload settings for the second interface correctly. I have used the 'bandwidth 50000' command for the first interface...would the commend for the second be 'bandwidth 20000 receive 100000'?
Thanks for the help!
01-19-2015 04:01 AM
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Posting
Could you further define "If I want the router's load balancing logic to work correctly, . . ."
The reason I ask, what you're looking at is telling the router what expected bandwidths are, which, alone, may not impact actual physical load balancing. Also, routers can often be configured for egress/outbound physical load balancing, but physical ingress/inbound load balancing can be very difficult to control. Also, router load balancing is often static, not dynamic.
(Although your question appears simple, the answer often is not.)
01-19-2015 05:59 AM
Well maybe I'm demonstrating my ignorance :-) I have both interfaces defined currently. If I fail one interface (unplug the Ethernet cable to outside), the load fails over to the other connection (tested). My (perhaps innacurate) understanding was that if I had bother interfaces defined with the same distance parameter, that the router's logic would calculate best path based on load. If one path is 100/20 and the other 50/50, then it would be throwing outbound traffic to the 100/20 interface when the 50/50 might be the better path. I looked at this: http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/100658-ios-nat-load-balancing-2isp.html, but I'm not sure I understood it :-(
-Nick
01-19-2015 06:12 AM
this is probably a better article: http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/99427-ios-nat-2isp.html
01-20-2015 01:42 AM
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Posting
Your first reference is static routing load balancing. Which, I believe, while links are up, would round robin outbound flows. You second reference is OER, which can dynamically load balance.
Unsure what your follow-up question is.
01-20-2015 06:17 AM
My desired outcome is:
What I really want is for the router to be aware of the relative performance of the two pipes and route based on that....available bandwidth would seem just one part of that equation...but once the data has been routed, does it know how the pipe is actually performing?
01-20-2015 07:10 AM
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Posting
"Normal" routing doesn't react to actual interface load utilization.
OER/PfR can react and actual load utilization.
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