7-3
Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
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Chapter 7 Configuring VLANs
IEEE 802.1Q VLAN Configuration Example
To configure VLANs using IEEE 802.1Q VLAN encapsulation, perform the following procedure,
beginning in global configuration mode:
Note In a bridge group on the ML-Series card, the VLAN ID does not have to be uniform across interfaces
that belong to that bridge group. For example, a bridge-group can connect from a VLAN ID subinterface
to a subinterface with a different VLAN ID, and then frames entering with one VLAN ID can be changed
to exit with a different VLAN ID. This is know as VLAN translation.
Note IP routing is enabled by default. To enable bridging, enter the no ip routing or bridge IRB command.
Note Native VLAN frames transmitted on the interface are normally untagged. All untagged frames received
on the interface are associated with the native VLAN, which is always VLAN 1. Use the command
encapsulation dot1q 1 native.
IEEE 802.1Q VLAN Configuration Example
The VLAN configuration example for the ML100T-12 shown in Figure 7-2 on page 7-4 depicts the
following:
• Fast Ethernet subinterface 0.1 is in the IEEE 802.1Q native VLAN 1.
• Fast Ethernet subinterface 0.2 is in the IEEE 802.1Q VLAN 2.
• Fast Ethernet subinterface 0.3 is in the IEEE 802.1Q VLAN 3.
• Fast Ethernet subinterface 0.4 is in the IEEE 802.1Q VLAN 4.
Command Purpose
Step 1
Router(config)# bridge
bridge-group
-
number
protocol
type
Assigns a bridge group (VLAN) number and
define the appropriate spanning tree type. See
Chapter 5, “Configuring Bridging.”
Step 2
Router(config)# interface
type number
Enters interface configuration mode to configure
the interface.
Step 3
Router(config-if)#no ip address
Disables IP processing.
Step 4
Router(config)# interface
type
number.subinterface-number
Enters subinterface configuration mode to
configure the subinterface.
Step 5
Router(config-subif)# encap dot1q
vlan-number
Sets the encapsulation format on the VLAN to
IEEE 802.1Q.
Step 6
Router(config-subif)# bridge-group
bridge-group
-
number
Assigns a network interface to a bridge group.
Step 7
Router(config-subif)# end
Returns to privileged EXEC mode.
Step 8
Router# copy running-config startup-config
(Optional) Saves your configuration changes to
NVRAM.
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