Network switch issues

Hi,

We have a D-link network stack on our network, along with a Cisco switch. The D-link stack and other D-link switches were introduced a number of weeks ago and all has been working fine, until a few days ago.

The issue we are experiencing seems to be down to the main D-link stack switches (D-Link DGS-3420-52T) One of the switches in the stack appears to be having issues booting and seems to knock the other switches off the network.  There is also a Cisco switch on board (existing one prior to the upgrade) this switch seems to be freezing when the D-link switch is attempting to boot.

Is anyone able to provide any details on what could possibly cause this?

Thanks
supportguy360Asked:
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Nasir-SiddiqueConnect With a Mentor Commented:
Check for any Physical loop in the network...Two cable connected to the same switch/Same VLAN in the stack.....in order to avoid this enable Spanning tree protocol for all the stacked switches and the cisco switch.
It seems that cisco switch is also on the same VLAN thats why it is getting efected as well. Make more VLAN, VLAN per switch or VLAN per geographic location. It will make the user segment smaller to reduce the problem domain.
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EddyvanOpdorpCommented:
Is there a firmware update for the switches ?
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giltjrCommented:
What model Cisco switch?  Do you have spanning tree enabled on it?  

Could be that when the D-Link switch is re-booting, the Cisco switch is going through the learning process which if the switch is not configured correctly will cause all traffic to stop for about 30 seconds.
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supportguy360Author Commented:
Many thanks
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