problem with Dell Powerconnect 5448, can ping, but nothing else

I have two Dell Powerconnect 5448. Two switches are configured with LAG on 6 ports. Rapid spanning tree. All other configurations are at default.

a few days ago, I was reported that all computers were disconnected from network. I investigated on servers, the mapped drives are disconnected, system events shows servers can't connect domain servers, DNS servers. I can ping any host, but can't do nothing other than it. I restarted the two switches, it solved the problem. I logged in to switches to check the log, but log is all cleared out and LAG configuration is also reset so that I had to reconfigure it.

It seems, somehow the switches blocks or failed to send/receive frames other than ICMP ping. What setting or configuration could cause this? I like to post settings, but it's too long, maybe you let me know what specific settings you want to know, then I will post here.

Also, this question is seperate from the question above. What is different having 6 ports in LAG than just having 6 ports connected without LAG? The combined bandwidth of 6Gbps ( 6X 1Gbps) ensures data transmission to use all the 6 ports or just evenly redirect each transmission among 6 ports which only uses upto only 1Gbps in max? Reading online, it seems the latter, if then, what is the advantage of configuring LAG?
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crcsupportAsked:
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dbright5813Connect With a Mentor Commented:
Is it safe to assume that you do not have any IP or MAC access lists defined?

I've never used LAG with more than 2 links between IVFs, but there shouldn't be any issues with your LAG configuration.

Also, are you running the 2.0.0.46 firmware? It looks like there was a bugfix for the switch crashing when using SNMP software.
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crcsupportAuthor Commented:
Yes, I updated firmware to 2.0.0.46. I just looked at download & update at Dell, this was the latest.
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crcsupportAuthor Commented:
I just disabled SNMP notification and hope the problem doesn't happen in next a couple of months.
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