Virgin Media Community

[DaGopha]

Hi folks,

Long story short - the blue traffic light on my SuperHub is blinking constantly. I'm in Modem Mode, and it still occurs when I have physically disconnected my router from it.

Have checked logs, and nothing in there. A couple of T3 timeouts, but nothing increasing. Have 2 of 4 upstream channels locked, all 8 downstream locked.

This occurred since a recent drop in service last week which was fixed by a reboot of the SuperHub and my router. There are a few posts out there about this and wondering if anyone else has been experiencing similar issues.

My actual net connection appears to be fine - normal speeds and no drops in connectivity - it's just the blue light that is going absolutely crazy. When my router is connected, its internet connectivity light flashes at the same frequency of the SuperHub activity light.

Called VM Support this morning and Tier 2 ran checks and said they couldn't find anything untoward and therefore wouldn't know how to progress things forward. They suggested that posting here would be the best move given that others have been experiencing this as well:

http://community.virginmedia.com/t5/Up-to-30Mb-Setup-Equipment/non-stop-rapid-blue-traffic-light/m-p...

http://community.virginmedia.com/t5/Up-to-120Mb-Setup-Equipment/PERMANENTLY-FLASHING-BLUE-LIGHT-ON-S...

There has been some suggestion of a misconfigured CMTS causing an ARP flood (http://community.virginmedia.com/t5/Up-to-30Mb-Setup-Equipment/oxfd-cmts-28-cable-mac2rvi-network-vi... and http://community.virginmedia.com/t5/Up-to-30Mb-Setup-Equipment/non-stop-rapid-blue-traffic-light/m-p...) which is obviously something that only Virgin can look into.

As I see this when the SuperHub is in Modem Modem with nothing else connected - I'm deducing it can't be anything on my end, unless the SuperHub is faulty, but I'd expect there to be other connection issues if that was the case, and Tier 2 can't see anything.

Would value some opinions and would be great if someone from Virgin technical could look into the CMTS to see if this is causing the issue.

With thanks,

Gopha

[Kath_F]

Hi Gopha, 

Thanks for your post

As there is nothing wrong with your connection there isn't really anything I can look into. 

I'm not sure why the lights would be acting in this way although if your service isn't affected I would leave things as they are. 

If of course your service does start having issues let us know and we can look into your connection. 

If the lights are bothering you, pop some black tape over them to dim them down. 

Thanks, 

[CarlTSpeak]

Crossposting again - sorry!

You are on a new CMTS. It's a multi-service edge router with CMTS cards in it and the RVI part of the source of the broadcasts is a routed VLAN interface.

Routed VLAN interfaces broadcast ARP requests and can service multiple subnets as they can have a primary and a number of sub-interfaces.

These broadcasts have no impact at all on your service. 10 broadcasts per second is nothing in the grand scheme. A customer downloading at full speed on 152Mb will have a throughput of over 13,000 packets per second downstream being acknowledged by potentially over 6,500 packets per second upstream.

Do not worry about it. The downstream broadcasts are fine - the responses are unicast and it's not an issue.