Blocking switchport if unauthorized router is connected

Will bpduguard enable command block a switchport if unknown router is connected to the port?

Thanks.
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InfamusAsked:
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Soulja53 6F 75 6C 6A 61 Commented:
No. Routers don't send BPDU's or take part in spanning tree.
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Soulja53 6F 75 6C 6A 61 Commented:
Have u considered using port security and lock the port down to a specific mac or number of mac addresses.
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pergrCommented:
The router would only be blocked if it starts to send BPDU - that is spanning tree protocol traffic - which is unlikely that a router will do.

So, no, the switch port will not be blocked.
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InfamusAuthor Commented:
Someone plugged in a linksys router which was advertsing itself as dns server with dhcp.  Is there a way to prevent that?
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Soulja53 6F 75 6C 6A 61 Commented:
Yes, enable dhcp snooping.

Enable it globally:

conf t
ip dhcp snooping


For interfaces that have legitimate dhcp servers

conf t
int fax/x or gix/x
ip dhcp snooping trust


****Assuming you are using Cisco, but other vendors should be similar.
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pergrCommented:
So, it was not an "unauthorized router", it was an "unauthorized DHCP server"...
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InfamusAuthor Commented:
Thank you.
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