Cisco nexus 5000 series nx-os software configuration guide

IEEE 802.1Q-in-Q VLAN Tag Termination

Encapsulating IEEE 802.1Q VLAN tags within 802.1Q enables service providers to use a single VLAN to support customers who have multiple VLANs. The IEEE 802.1Q-in-Q VLAN Tag Termination feature on the subinterface level preserves VLAN IDs and keeps traffic in different customer VLANs segregated.

Feature History for the IEEE 802.1Q-in-Q VLAN Tag Termination Feature

Release	Modification
12.3(7)T	This feature was introduced.
12.3(7)XI1	This feature was implemented on the Cisco 10000 series router.

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Chapter Information

Contents

1. «Do I Know This Already?» Quiz
2. VLAN Routing with Router 802.1Q Trunks
3. VLAN Routing with Layer 3 Switch SVIs
4. VLAN Routing with Layer 3 Switch Routed Ports
5. Chapter Review
6. Review All the Key Topics
7. Key Terms You Should Know
8. Command References

Chapter Description

In this sample chapter from CCNA 200-301 Official Cert Guide, Volume 1, Wendell Odom discusses the configuration and verification steps related to three methods of routing between VLANs with three major sections: VLAN Routing with Router 802.1Q Trunks, VLAN Routing with Layer 3 Switch SVIs, and VLAN Routing with Layer 3 Switch Routed Ports.

Configuration Examples for IEEE 802.1Q-in-Q VLAN Tag Termination

This section contains the following example:

•

Configuring any Keyword on Subinterfaces for IEEE 802.1Q-in-Q VLAN Tag Termination: Example

Some ambiguous subinterfaces can use the any keyword for the inner VLAN ID specification. The any keyword represents any inner VLAN ID that is not explicitly configured on any other interface. In the following example, seven subinterfaces are configured with various outer and inner VLAN IDs.

Note The any keyword can be configured on only one subinterface of a specified physical interface and outer VLAN ID.

interface GigabitEthernet1/0/0.1

 encapsulation dot1q 100 second-dot1q 100

interface GigabitEthernet1/0/0.2

 encapsulation dot1q 100 second-dot1q 200

interface GigabitEthernet1/0/0.3

 encapsulation dot1q 100 second-dot1q 300-400,500-600

interface GigabitEthernet1/0/0.4

 encapsulation dot1q 100 second-dot1q any

interface GigabitEthernet1/0/0.5

 encapsulation dot1q 200 second-dot1q 50

interface GigabitEthernet1/0/0.6

 encapsulation dot1q 200 second-dot1q 1000-2000,3000-4000

interface GigabitEthernet1/0/0.7

 encapsulation dot1q 200 second-dot1q any

shows which subinterfaces are mapped to different values of the outer and inner VLAN ID on Q-in-Q frames that come in on Gigabit Ethernet interface 1/0/0.

Table 1 Subinterfaces Mapped to Outer and Inner VLAN IDs for GE Interface 1/0/0 

Outer VLAN ID

Inner VLAN ID

Subinterface mapped to

100

1 through 99

GigabitEthernet1/0/0.4

100

100

GigabitEthernet1/0/0.1

100

101 through 199

GigabitEthernet1/0/0.4

100

200

GigabitEthernet1/0/0.2

100

201 through 299

GigabitEthernet1/0/0.4

100

300 through 400

GigabitEthernet1/0/0.3

100

401 through 499

GigabitEthernet1/0/0.4

100

500 through 600

GigabitEthernet1/0/0.3

100

601 through 4095

GigabitEthernet1/0/0.4

200

1 through 49

GigabitEthernet1/0/0.7

200

50

GigabitEthernet1/0/0.5

200

51 through 999

GigabitEthernet1/0/0.7

200

1000 through 2000

GigabitEthernet1/0/0.6

200

2001 through 2999

GigabitEthernet1/0/0.7

200

3000 through 4000

GigabitEthernet1/0/0.6

200

4001 through 4095

GigabitEthernet1/0/0.7

A new subinterface is now configured:

interface GigabitEthernet1/0/0.8

 encapsulation dot1q 200 second-dot1q 200-600,900-999

shows the changes made to the table for the outer VLAN ID of 200. Notice that subinterface 1/0/0.7 configured with the any keyword now has new inner VLAN ID mappings.

Table 2 Subinterfaces Mapped to Outer and Inner VLAN IDs for GE Interface 1/0/0—Changes Resulting from Configuring GE Subinterface 1/0/0.8 

Outer VLAN ID

Inner VLAN ID

Subinterface mapped to

200

1 through 49

GigabitEthernet1/0/0.7

200

50

GigabitEthernet1/0/0.5

200

51 through 199

GigabitEthernet1/0/0.7

200

200 through 600

GigabitEthernet1/0/0.8

200

601 through 899

GigabitEthernet1/0/0.7

200

900 through 999

GigabitEthernet1/0/0.8

200

1000 through 2000

GigabitEthernet1/0/0.6

200

2001 through 2999

GigabitEthernet1/0/0.7

200

3000 through 4000

GigabitEthernet1/0/0.6

200

4001 through 4095

GigabitEthernet1/0/0.7

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Additional References

The following sections provide references related to the IEEE 802.1Q-in-Q VLAN Tag Termination feature.

Related Documents

Related Topic	Document Title
Interface commands: complete command syntax, command mode, defaults, usage guidelines, and examples	Cisco IOS Interface and Hardware Component Command Reference, Release 12.3 T
Interface configuration examples

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