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Chapter 11
Configuring VLANs
Multiple hosts (MAC addresses) can be active on a dynamic-access port if they are all in the same
VLAN; however, the VMPS shuts down a dynamic-access port if more than 20 hosts are active on the
port.
If the link goes down on a dynamic-access port, the port returns to an isolated state and does not belong
to a VLAN. Any hosts that come online through the port are checked again through the VQP with the
VMPS before the port is assigned to a VLAN.
Dynamic-access ports can be used for direct host connections, or they can connect to a network. A
maximum of 20 MAC addresses are allowed per port on the switch. A dynamic-access port can belong
to only one VLAN at a time, but the VLAN can change over time, depending on the MAC addresses seen.
Default VMPS Client Configuration
Table 11-7
Table 11-7
Feature
VMPS domain server
VMPS reconfirm interval
VMPS server retry count
Dynamic-access ports
VMPS Configuration Guidelines
These guidelines and restrictions apply to dynamic-access port VLAN membership:
•
•
•
•
•
•
•
•
•
OL-8915-03
shows the default VMPS and dynamic-access port configuration on client switches.
Default VMPS Client and Dynamic-Access Port Configuration
You should configure the VMPS before you configure ports as dynamic-access ports.
When you configure a port as a dynamic-access port, the spanning-tree Port Fast feature is
automatically enabled for that port. The Port Fast mode accelerates the process of bringing the port
into the forwarding state.
IEEE 802.1x ports cannot be configured as dynamic-access ports. If you try to enable IEEE 802.1x
on a dynamic-access (VQP) port, an error message appears, and IEEE 802.1x is not enabled. If you
try to change an IEEE 802.1x-enabled port to dynamic VLAN assignment, an error message appears,
and the VLAN configuration is not changed.
Trunk ports cannot be dynamic-access ports, but you can enter the switchport access vlan dynamic
interface configuration command for a trunk port. In this case, the switch retains the setting and
applies it if the port is later configured as an access port.
You must turn off trunking on the port before the dynamic-access setting takes effect.
Dynamic-access ports cannot be monitor ports.
Secure ports cannot be dynamic-access ports. You must disable port security on a port before it
becomes dynamic.
Private VLAN ports cannot be dynamic-access ports.
Dynamic-access ports cannot be members of an EtherChannel group.
Port channels cannot be configured as dynamic-access ports.
Default Setting
None
60 minutes
3
None configured
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring VMPS
11-29
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Troubleshooting
