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17 VLANs
17.8.3 Configuring native VLANs for MAC ports
Points to note
Native VLANs are set to handle untagged frames that do not match the MAC
addresses registered for MAC VLANs on a MAC port. Only port VLANs can be set
for native VLANs.
When the VLAN ID of a native VLAN is specified by the
vlan
the MAC addresses registered for the MAC port. The native VLAN is VLAN 1 (the
default VLAN) unless explicitly specified otherwise in the configuration.
When
registered MAC addresses are not forwarded.
Command examples
1.
(config)# vlan 10,20 mac-based
(config-vlan)# exit
(config)# vlan 30
(config-vlan)# exit
Creates VLAN 10 and 20 as MAC VLANs. Then, creates VLAN 30 as a port VLAN.
2.
(config)# interface fastethernet 0/1
(config-if)# switchport mode mac-vlan
Switches to the Ethernet interface configuration mode for port 0/1. Also, sets the port
as a MAC port.
3.
(config-if)# switchport mac vlan 10.20
Sets MAC VLANs 10 and 20 to port 1/0.
Port 0/1 allows only MAC VLANs 10 and 20 communications. Unregistered MAC
addresses cannot be used for communication. To use an unregistered MAC address
for communication, change the settings to allow communication to be established
from the native VLAN.
4.
(config-if)# switchport mac native vlan 30
(config-if)# exit
Sets the native VLAN of port 0/1 as port VLAN 30. VLAN 30 handles untagged
frames from MAC addresses not registered for port 0/1.
17.8.4 Setting forwarding of tagged frames on a MAC port
In the configuration shown in the figure below, if the Switch communicates with an IP
telephone by receiving tagged frames on a port, and with a terminal under the IP telephone
by receiving untagged frames on the same port, use the optional functionality for MAC
ports.
In this optional functionality, if you use the
command and specify a VLAN ID to be used for forwarding of tagged frames, tagged
frames and untagged frames can be forwarded on the same MAC port.
For details about the settings to authenticate IP telephones and terminals using Layer 2
authentication, see the Configuration Guide Vol. 2.
278
configuration command, the VLAN handles untagged frames that do not match
status suspend
is set for a native VLAN, frames that do not match the
switchport mac native
switchport mac dot1q vlan
configuration
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