network disconnected when connect layer3 sg350 bridge to 2960 switch

[ahusseinabdallah]

Hi All , i need your support about the SG350 cisco layer 3 switch , just i connect the switch to the network with a bridge the connection in my computer disconnected an reconnect again , any reason for this issue , the another device is catalyst 2960  , Thanks.

[Seb Rupik]

HI there,

What is the ode of the siwtchports you are using to connect these two switches with?

Can you share the config of both switches and indicate which switcchports they are connected on.

cheers,

Seb.

[ahusseinabdallah]

i check the ports it is trunk mode , but i found there is unman-aged switch in between the two switches , maybe this is the reason for disconnected .

thanks

[Seb Rupik]

Sounds like it could be an STP issue.

Is your PC connected to the 2960? Is the 2960 the root bridge for the VLAN you are connected to?

On both the 2960 and SG 350 what is the output of:

sh spanning-tree vlan <your_vlan_id>

cheers,

Seb.