I have a 5505(L3) that multiple 2948G-L2 switches connect to. Several of the 2948G will have VLAN100 on them. If I plug in more than 1 2948G with VLAN100 active I lose access to all VLAN100 devices. It appears that a loop blocking maybe causing it to shut down ports on the 5505. Each one of the 2948G switches plugs directly into the 5505 and not to each other. The 5505 and the 2948G are both configured with VLAN ALL allowed on the interconnecting ports.
Are there any options other than to connect all the 2948G switches together?