Specifications

Configuring Routing Between VLANs
How to Configure Routing Between VLANS
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Prerequisites
For the Cisco 10000 series Internet router:
• PPPoE is already configured.
• Virtual private dial-up network (VPDN) is enabled.
The first task is optional. A step in this task shows you how to configure the EtherType field to be 0x9100
for the outer VLAN tag, if that is required.
After the subinterface is defined, the 802.1Q encapsulation is configured to use the double tagging.
Configuring EtherType Field for Outer VLAN Tag Termination
To configure the EtherType field for Outer VLAN Tag Termination, use the following steps. This task is
optional.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. dot1q tunneling ethertype ethertype
DETAILED STEPS
Command or Action Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
interface type number
Example:
Router(config)# interface gigabitethernet 1/0/0
Configures an interface and enters interface configuration
mode.
Step 4
dot1q tunneling ethertype ethertype
Example:
Router(config-if)# dot1q tunneling ethertype
0x9100
(Optional) Defines the Ethertype field type used by peer
devices when implementing Q-in-Q VLAN tagging.
• Use this command if the Ethertype of peer devices is
0x9100 or 0x9200 (0x9200 is only supported on the
Cisco 10000 series Internet router).
• Cisco 10000 series Internet router supports both the
0x9100 and 0x9200 Ethertype field types.