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?