200 series Smart Switch does not, DHCP blocked

I have a network of SMEs small and simple.  There are 2 switches: a switch 8 ports connected to my main Windows Server (which is the DHCP provider for the network) and a switch of 24 ports that is plugged into the switch 8 ports.

I replaced these switches (Dell unmanaged switches) with intelligent switches in the Cisco 200 series (models 8 or 26-port).  When I plug the 26-port switch into switch 8 ports, it is impossible to obtain the DHCP in Windows server address.  Also, any device plugged into the 26-port switch cannot communicate with another, and all the lights of the port ethernet flash simultaneously at the same frequency - quite a light show!

If I plug the Server Windows DIRECTLY into the 26-port switch, it receives a DHCP address.

I tried a 2nd swtich 26-port Cisco and it does the same thing, so I guess this isn't a hardware problem.

What is the solution to this problem?

Louis,


Try this, go to the first 200 series switch that is connected to the server and go to the tab covering tree.


Under the properties of spanning tree tab, set the priority of bridge to 0.  This puts the root of the tree cover.


Try this and see if the second switch traffic and that it receives the ip address.

Tags: Cisco Support

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