Abstract: Systems and methods are disclosed herein for determining that a diagnostic mode is enabled for a port of a switch, the port being part of a VLAN, and responsively designating a port of the plurality of ports as a loopback port, where a packet transmitted on the loopback port is forwarded according to an entry of a forwarding database. The disclosure further describes generating a layer 2 multicast index comprising an entry for the port and an entry for the loopback port, programming the forwarding database with an entry for a destination address of the switch pointing to the layer 2 multicast index, generating a diagnostic packet, and transmitting the diagnostic packet on the loopback port. Additionally, the disclosure describes determining that the diagnostic packet is received by any port of the plurality of ports, and responsively determining a network problem exists and causing a diagnostic protocol to be executed.

Abstract: Systems and methods are disclosed herein for determining that a diagnostic mode is enabled for a port of a switch, the port being part of a VLAN, and responsively designating a port of the plurality of ports as a loopback port, where a packet transmitted on the loopback port is forwarded according to an entry of a forwarding database. The disclosure further describes generating a layer 2 multicast index comprising an entry for the port and an entry for the loopback port, programming the forwarding database with an entry for a destination address of the switch pointing to the layer 2 multicast index, generating a diagnostic packet, and transmitting the diagnostic packet on the loopback port. Additionally, the disclosure describes determining that the diagnostic packet is received by any port of the plurality of ports, and responsively determining a network problem exists and causing a diagnostic protocol to be executed.

Abstract: Methods, systems, and computer program products for selective layer 2 port blocking using layer 2 source addresses are disclosed. According to one method, a layer 2 frame is received. An I/O port block list is identified based on a layer 2 source address in the layer 2 frame. A set of ports to which the layer 2 fame should be forwarded is identified. The frame is blocked from being forwarded to ports in the set that are also in the I/O port block list.