Network down as result of possible broadcast storm.
We have a medium size network that is down as a result of what appears to be a broadcast storm. We powered down all switches. Then, we disconnected all devices on the switches. Next we connected devices one at a time. All seemed to be going well until about 3/4 thru the process (48 port switch). All of a sudden the all the led indicators started blinking again. We reversed the process, unplugging connections one by one (with a 1-2 minute wait between). The issue did not go away. The primary switch we were working with was a Dell. All other switches are Dell with the exception of a few smaller switches in offices where it was easier to place a switch than run new cable(s). Does anyone have any suggestions?
did u enabled the spanning tree protocol on swthes ?
Spanning Tree Convergence is what I'm thinking.
Or, the 48-port switch may be bad.
Or, the 48-port switch may be bad.
How many switches are involved? Can you share a connectivity diagram? Is this a new build? If not has there been a recent addition of switches? If not, what are the recent changes to the network (new hosts connected/moved, changes to uplinks, etc. - last 7 days)? What have you done to attempt to isolate besides shutting down and re-connecting?
ASKER
8 switches involved. Majority of switches are Dell 5548 and 6248. There are a few "other" switches involved. These are generally 5 port switches in a office where it would be a major project to run another cable. We have not add any additional switches in the last few weeks. We have changed out a couple of pc's.
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Thanks to all for your assistance. There were multiple problems on the network. The biggest issue was a bad 10Gb cable to the HyperV host. We essentially followed the plan laid our by Atlas. We would have caught the problem earlier. However, we had an entire office who had to use the system to enter and process orders. So, we did not have the luxury of shutting everything down. A limping system was better than nothing. And, we resolved issues as they came up. Today was a holiday and with no one in the office, we were able to isolate switches and analyze results of tests. In addition to the cable problem, there appears to be at least one bad switch in the network. Thanks for your assistance.
No worries. Glad you were able to get it sorted. Been there. Cheers
Turn off any lesser used wireless routers and reset the others.