MAC Table (ONS 15454 SDH only) Use the MAC Table subtab to view MAC information for the Ethernet circuits routed on spanning trees. Item Description MAC Address Displays the MAC address of nodes on the spanning tree. VLAN Displays the number of VLANs used by the circuits. Slot/Port/VC4 Displays the Ethernet circuit slot, port, and VC4. Circuit Name Displays the circuit name. Layer 2 Domain Displays the name of the Layer 2 domain. Retrieve Retrieves MAC table circuit information. Clear Displays the Clear MAC Address dialog box where you can clear the MAC address by VLAN/MAC pairs, by VLAN, or by port. Clear All Clears all fields. Help Displays context-sensitive help.