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Dlink Switch--2 connection to Cisco Switch

Posted on 2009-05-19
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Last Modified: 2012-05-07
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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Question by:ssshibu
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5 Comments
 
LVL 21

Expert Comment

by:from_exp
ID: 24420633
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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Author Comment

by:ssshibu
ID: 24420647
Dear

Thanks for the quick reply.

Please find attached the switch config.

Thanks

-admin-sw01-confg.txt
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LVL 21

Assisted Solution

by:from_exp
from_exp earned 375 total points
ID: 24420770
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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Author Comment

by:ssshibu
ID: 24420832
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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LVL 21

Accepted Solution

by:
from_exp earned 375 total points
ID: 24420876
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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