cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

CISCO SWITCHES FOR SMALL and MEDIUM BUSINESS

Introducing the next generation of Cisco Small and Medium Business Switches. Cisco is refreshing its SMB Switch portfolio. Click here  to learn more.


1230
Views
0
Helpful
1
Replies
chris.loverme
Beginner

SG-300 series switches - Network loop / broadcast storm question

So the SG300's have STP on them and prevent network loops when other switches on the network also support STP too.  However, if someone plugs in a non-managed switch that doesn't support STP with a network loop, is there anything within the SG300 switches to help isloate and/or prevent that from happening?

(I currently have port mirroring turned on for one port and a network sniffer attached awaiting the incident to happen again).

Thanks,

Chris

1 REPLY 1
Tom Watts
Advocate

Hi Chris, the lowest cost path connection will go to a discard state on the interface of the SG300 switch. So, even if the unmanage switch has 2 physical connections, the spanning tree will shut down one port to prevent this loop.

-Tom
Please rate helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/