I have an install with the following:
The activity lights on the switches seem to flash in unison or in a "strobe" fashion.
Is this an issue or is this the natural way the activity lights flash?
Please advise as this is a concern for the customer. They believe it is not normal even though voice and data traffic seem to be working fine.
Thank you, Paul
Maybe it's the same problem I noticed on UC540W or other switches: a significant sending of packets to multicast addresses 22.214.171.124!
In some thread I read that in the past there was some bug on MOH in UC500, and perhaps has not been solved or at least depends on some specific setup or installation ... I think I've already complained about it but I had no answer :-(
You are so so correct,
The activity LEDs on a Switch will flash when there is activity.
The Voice VLAN is receiving lots of multicast packets all the time, I believe MOH multicasts.
So what is obserbed is not a bug, the switch will flash it's activity LEDs when there is activity. There just happens to be lots and lots of multicasts arriving at VLAN 100 all the time.
I turned around in my lab and noticed that the two switches I have connected to my UC500, a ESW540P and Catalyst 2960P both have their activity LEDs flashing in unison.
To validate the observation I went into my ESW GUI and used the switch> smartports option to place one port in desktop mode with only the default VLAN connected to that port. In other words removed VLAN 100 from that particular switch port.
As expected, I noticed that particular switch port stopped flashng in unison.
I then plugged my MP3 player into my UC500 MOH port , and played Glenn Miller "In the Mood," and put a phone on hold.
The activity lights didn't flash in unison to the music, shame that would be a neat feature, but my UC500 is sending out too many multicast packets to vlan 100. Such is life....
Just imagine all the LEDs on a switch flashing in unison to Handel's Messiah wow that would be neat.
I ran into this right after we had a new UC560 installed. For me, I was able to "cure" it by disabling "Enable music on hold for internal calls."
The statement that this is simply traffic on the voice VLAN is not always correct, I had hundreds of thousands of these packets being logged and dropped on my firewall that is NOT on the voice VLAN.
Awesome information. I just got in a UC560 and 60 phones for a new client. I will test this out on this setup. Instead of the MOH internally, I am pretty sure that it will just beep 3 times at a specific time if you are put on hold internally if you turn this off but will make sure with this setup and let you know.