Internet Drops Randomly When Using Procurve 2910

Aug 31, 2012

So we recently moved our Comcast demarc to our new server room which resulted in moving the SMC modem from our old server room where it directly connects to the firewall - to a new room where it connects to a 2910 switch, LACP to our L3 switch, LACP to another 2910, then to Sonicwall.

Since the move our internet has been dropping off randomly for about 2-5 minutes then it will come back online. This happens anywhere from 10 to 50 times a day. Sometimes it happens a half hour apart, sometimes it is 15 minutes apart, sometimes it will go 8 hours without issue.

The modem has been replaced, the Comcast line has been "tested."

The modem remains online when we lose internet connectivity - I can connect to it using a laptop on it's lan port and ping out to google.com while an computer connected beyond the switch and sonicwall cannot connect.

I have run a constant ping from a home comptuer to the modem as well as to our sonicwall (both static addresses) and they both seem to go offline when we lose internet connectivity.

Since the issue started, I moved the Sonicwall so that it connects directly to the 2910 that the modem connects to, put it in a vlan with the modem so they only talk to each other and it still results in the same intermittent disconnects. I checked all the port statistics on both ports as well as the event logs, and trunk links and find nothing abnormal.

I take the switch out entirely and plug the modem directly into the firewall like it was prior to the whole move. Works fine.

Traffic is not an issue and the switch in question also connects all my production servers and iSCSI SAN together without issue.

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[code]....

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