Cisco WS-C2955T-12 Software Manual page 230

Overlapping VLANs and Multi-VLAN Ports
Figure 8-2
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:
Command
Step 1 configure terminal
Step 2 interface interface
Step 3 switchport mode multi
Step 4
switchport multi vlan vlan-list
Step 5 end
Step 6
show interface interface-id
switchport
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
8-8
Two VLANs Sharing a Port Connected to a Router
Ports in static-access
mode
VLAN 77
Cisco router
Port in multi-VLAN mode
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.
VLAN 42
Chapter 8 Configuring VLANs
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