Cisco WS-C2960-24TT-L Software Guide - Page 230
Two VLANs Sharing a Port Connected to a Router, Caution, Step 1
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Overlapping VLANs and Multi-VLAN Ports Figure 8-2 Two VLANs Sharing a Port Connected to a Router Ports in static-access mode Chapter 8 Configuring VLANs 12516 VLAN 77 Cisco router VLAN 42 Port in multi-VLAN mode Caution To avoid unpredictable STP behavior and a loss of connectivity, do not connect multi-VLAN ports to hubs or switches. Connect multi-VLAN ports to routers or servers. Beginning in privileged EXEC mode, follow these steps to assign ports for multi-VLAN membership: Step 1 Step 2 Command configure terminal interface interface Step 3 switchport mode multi Step 4 switchport multi vlan vlan-list Step 5 Step 6 end show interface interface-id switchport Purpose Enter global configuration mode. Enter interface configuration mode, and enter the port to be added to the VLAN. Enter the VLAN membership mode for multi-VLAN ports. Assign the port to more than one VLAN. Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs. Configuring a switch port for multi-VLAN mode causes VTP to transition to transparent mode, which disables VTP. Return to privileged EXEC mode. Verify your entries. Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 8-8 78-6511-08