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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 15 Configuring VLANs, VTP, and VMPS
VLAN Membership Policy Server
This example shows how to configure a dynamic access port and to verify the entry:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface fa1/1
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan dynamic
Switch(config-if)# end
Switch# show interface fa1/1 switchport
Name: Fa0/1
Switchport: Enabled
Administrative mode: dynamic auto
Operational Mode: dynamic access
Administrative Trunking Encapsulation: isl
Operational Trunking Encapsulation: isl
Negotiation of Trunking: Disabled
Access Mode VLAN: 0 ((Inactive))
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Enabled: NONE
Pruning VLANs Enabled: NONE
Voice Ports
If a VVID (voice VLAN ID) is configured on a dynamic access port, the port can belong to both an
access VLAN and a voice VLAN. Consequently, an access port configured for connecting an IP phone
can have separate VLANs for the following:
• Data traffic to and from the PC that is connected to the switch through the access port of the IP phone
(access VLAN)
• Voice traffic to and from the IP phone (voice VLAN)
Reconfirming VLAN Memberships
To confirm the dynamic port VLAN membership assignments that the switch has received from the
VMPS, perform this task:
Configuring Reconfirmation Interval
VMPS clients periodically reconfirm the VLAN membership information received from the VMPS. You
can set the number of minutes the VMPS client waits before reconfirming the VLAN-to-MAC-address
assignments.
To configure the reconfirmation interval, perform this task:
Command Purpose
Step 1
Switch# vmps reconfirm
Reconfirms dynamic port VLAN membership.
Step 2
Switch# show vmps
Verifies the dynamic VLAN reconfirmation status.
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# vmps reconfirm minutes
Specifies the number of minutes between reconfirmations of the
dynamic VLAN membership.
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