#MULTICAST TRAFFIC GENERATOR WINDOWS SOFTWARE KEYGEN#
Going through the basic troubleshooting steps didn’t show any useful information. % LINEPROTO - SW1_SP - 5 - UPDOWN : Line protocol on Interface GigabitEthernet1 / 1 / 12, changed state to upĪccessing switches on the other side of these links did not provide any information as to why this was happening. There was no indication of why, just link up/down: Just about all the ports on the Cisco VSS (2×6509),over 250 ports, were going up and down. We saw lots of messages indicating port down/ups. Our monitoring systems were reporting major outages throughout our network. Initial troubleshooting did not lead to the cause, as will be detailed below. Through a combinations of details about our environment, this caused a large-scale outage. In our case, these were Dell 9020s with Intel I217-LM NICs. My purpose is to share our experiences, symptoms, and commands used to identify the problem so that others faced with this situation can more quickly identify and isolate the problem.Ĭertain Intel NICs, when the host machine goes to sleep, will send out excessive amounts of IPv6 multicast listener report traffic. Some steps during the investigation and details of our environment have been left out. Rather, it’s meant to be a heads up if you see something similar in your environment.īecause this is an outage report, I’ll start with the good stuff (an explanation of details). This isn’t a forensic analysis of the cause or of different behaviors in various environments. This will be combination of a journal of symptoms, troubleshooting steps taken, and a brief overview of the environment and platforms involved. This is the write-up of a recent event we experienced on our network.
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