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Dlink Switch--2 connection to Cisco Switch

Dear All,

Please find attached one of our Switch configuration. this switch has been interconnected another switches in the network.

Today morning one of the user brought a Dlink switch and connected two port to the attached switch. there was two connection were dropped in cabin from the switch. suddenly all our other switch including the attached switch were started blinking . network is tottaly collapsed...no one was able to work.

atlast we idenfied the culprit and switched of the Dlink switch.

As per my understading Spanning -tree is been configured in the swiches. why it was not blocking the other link from the Dlink switch?

Could you please check the attached configuration a and guide me to prevent such incidents in future.

Thanks
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ssshibu
Asked:
ssshibu
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2 Solutions
 
from_expCommented:
you have not attached anything to this post.
as for your situation - there is difference, between loops and rings.
spanning tree is designed to disable redundant paths (within rings)

you have a loop in your topology and you need loop detection technologies. (the same result you can get, when you connect two ports of a switch with a cable (even without additional d-link)
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ssshibuAuthor Commented:
Dear

Thanks for the quick reply.

Please find attached the switch config.

Thanks

-admin-sw01-confg.txt
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from_expCommented:
hm.
you have enabled bpdufilter on all ports, which effectively blocks spanning tree within your network.
just remove bpdufilter setting from all ports.
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ssshibuAuthor Commented:
dear ,

I can see the bpdufilter enabled in all the switches. this configuration is there since begining in all the switches.
Should i face any other issue if i remove the command from all the device.


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from_expCommented:
yepp

please do it after business hours
please also remove bpdu root guard. you don't need within your network, unless you don't have well defined topology with solid root switch(with according weight)

most likely you will need to connect to all switches using console port.
and first of all I would recommend to have a clear picture of current wirings between switches
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