Playing in the lab and want to impair a link with delay or loss?
I use WAN Bridge – its simple and free.
So say I’m testing an SD-WAN brownout/impairment avoidance solution in my lab. For example, Cisco’s IWAN. I’m going to need something to impair links with delay or loss. I like WAN Bridge. Why? Because its simple, easy, and free.
There has been one thing I’ve struggled with in the past year about. Every time I needed an impairment point this burned up 2 NICs on my UCS equipment. Why? Cause I couldn’t seem to figure out how to load one NIC on a UCS as a trunk port with multiple VLANs on it and have multiple WAN bridges with just 1 trunk on a switch.
So that meant, for a recent CPOC that I was doing, if I really wanted 6 impairment points (red circles in diagram below) I was going to need to eat up 12 NICs on my UCS.
There had to be a better way…..
My friend, David Prall, was convinced it “should” work. I was equally convinced that I had tried it before and Continue reading
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Rima Quereshi will handle Ericsson's partnership with Cisco.
More than half of surveyed respondents are actively looking at APM and NPM systems.
What about I2RS performance?
The first post in this series provides a basic overview of I2RS; there I used a simple diagram to illustrate how I2RS interacts with the RIB—
One question that comes to mind when looking at a data flow like this (or rather should come to mind!) is what kind of performance this setup will provide. Before diving into the answer to this question, though, perhaps it’s important to ask a different question—what kind of performance do you really need? There are (at least) two distinct performance profiles in routing—the time it takes to initially start up a routing peer, and the time it takes to converge on a single topology and/or route change. In reality, this second profile can be further broken down into multiple profiles (with or without an equal cost path, with or without a loop free alternate, etc.), but for our purposes I’ll just deal with the two broad categories here.
If your first instinct is to say that initial convergence time doesn’t matter, go back and review the recent Delta Airlines outage carefully. If you are still not convinced initial convergence time matters, go back and reread what you can Continue reading