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This figure shows the tag structures of the double-tagged packets.
Figure 10: Original (Normal), IEEE 802.1Q, and Double-Tagged Ethernet Packet Formats
When the packet enters the trunk port of the service-provider egress switch, the outer tag is again stripped as
the switch internally processes the packet. However, the metro tag is not added when the packet is sent out
the tunnel port on the edge switch into the customer network. The packet is sent as a normal IEEE
802.1Q-tagged frame to preserve the original VLAN numbers in the customer network.
In the above network figure, Customer A was assigned VLAN 30, and Customer B was assigned VLAN 40.
Packets entering the edge switch tunnel ports with IEEE 802.1Q tags are double-tagged when they enter the
service-provider network, with the outer tag containing VLAN ID 30 or 40, appropriately, and the inner tag
containing the original VLAN number, for example, VLAN 100. Even if both Customers A and B have VLAN
100 in their networks, the traffic remains segregated within the service-provider network because the outer
tag is different. Each customer controls its own VLAN numbering space, which is independent of the VLAN
numbering space used by other customers and the VLAN numbering space used by the service-provider
network.
At the outbound tunnel port, the original VLAN numbers on the customer’s network are recovered. It is
possible to have multiple levels of tunneling and tagging, but the switch supports only one level in this release.
If traffic coming from a customer network is not tagged (native VLAN frames), these packets are bridged or
routed as normal packets. All packets entering the service-provider network through a tunnel port on an edge
switch are treated as untagged packets, whether they are untagged or already tagged with IEEE 802.1Q headers.
The packets are encapsulated with the metro tag VLAN ID (set to the access VLAN of the tunnel port) when
they are sent through the service-provider network on an IEEE 802.1Q trunk port. The priority field on the
metro tag is set to the interface class of service (CoS) priority configured on the tunnel port. (The default is
zero if none is configured.)
On switches, because 802.1Q tunneling is configured on a per-port basis, it does not matter whether the switch
is a standalone switch or a stack member. All configuration is done on the stack master.
Related Topics
Configuring an IEEE 802.1Q Tunneling Port, on page 133
Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1
126 OL-29440-01
Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling
IEEE 802.1Q Tunneling
- 15.0(2)EX1 1
- CONTENTS 3
- OL-29440-01 v 5
- OL-29440-01 vii 7
- OL-29440-01 ix 9
- Contents 10
- Document Conventions 11
- Timesaver 12
- Related Documentation 13
- Command Modes 15
- Table 1: Command Mode Summary 16
- Using the Help System 17
- CLI Error Messages 18
- Configuration Logging 19
- Recalling Commands 20
- 12 OL-29440-01 26
- Configuring VTP 27
- Information About VTP 28
- VTP Modes 29
- VTP Advertisements 30
- VTP Version 2 31
- VTP Version 3 31
- VTP Pruning 32
- OL-29440-01 19 33
- VTP and Switch Stacks 34
- VTP Configuration Guidelines 34
- Passwords for the VTP Domain 35
- VTP Version 36
- Default VTP Configuration 37
- How to Configure VTP 38
- Enabling the VTP Version 42
- Enabling VTP Pruning 43
- Monitoring VTP 48
- OL-29440-01 37 51
- 38 OL-29440-01 52
- Configuring VLANs 53
- Restrictions for VLANs 54
- Information About VLANs 54
- Supported VLANs 55
- VLAN Port Membership Modes 55
- Normal-Range VLAN Overview 56
- Token Ring VLANs 57
- 44 OL-29440-01 58
- OL-29440-01 45 59
- Default VLAN Configuration 60
- How to Configure VLANs 61
- Deleting a VLAN 63
- Monitoring VLANs 70
- Configuration Examples 71
- OL-29440-01 59 73
- 60 OL-29440-01 74
- Configuring VLAN Trunks 75
- Restrictions for VLAN Trunks 76
- Information About VLAN Trunks 76
- Layer 2 Interface Modes 77
- Allowed VLANs on a Trunk 78
- Load Sharing on Trunk Ports 78
- OL-29440-01 65 79
- Feature Interactions 80
- How to Configure VLAN Trunks 81
- 82 OL-29440-01 96
- 84 OL-29440-01 98
- OL-29440-01 85 99
- 86 OL-29440-01 100
- Configuring Private VLANs 100
- Private VLAN Domains 101
- Secondary VLANs 102
- Private VLANs Ports 102
- Private VLANs in Networks 103
- 90 OL-29440-01 104
- OL-29440-01 91 105
- Private VLANs and SVIs 106
- SUMMARY STEPS 107
- DETAILED STEPS 108
- Example: 113
- Monitoring Private VLANs 115
- Where to Go Next 118
- Additional References 118
- OL-29440-01 105 119
- 106 OL-29440-01 120
- Configuring VMPS 121
- Restrictions for VMPS 122
- Information About VMPS 122
- OL-29440-01 109 123
- How to Configure VMPS 124
- Before You Begin 126
- Reconfirming VLAN Memberships 127
- Changing the Retry Count 129
- Monitoring the VMPS 131
- 120 OL-29440-01 134
- Tunneling 135
- Layer 2 Protocol Tunneling 136
- OL-29440-01 123 137
- Information about Tunneling 138
- OL-29440-01 125 139
- IEEE 802.1Q Tunneling 139
- 126 OL-29440-01 140
- Native VLANs 141
- System MTU 142
- OL-29440-01 129 143
- 130 OL-29440-01 144
- OL-29440-01 131 145
- 132 OL-29440-01 146
- How to Configure Tunneling 147
- Monitoring Tunneling Status 160
- 148 OL-29440-01 162
- Configuring Voice VLANs 163
- Restrictions for Voice VLANs 164
- Information About Voice VLAN 164
- Cisco IP Phone Voice Traffic 165
- Cisco IP Phone Data Traffic 165
- 152 OL-29440-01 166
- How to Configure Voice VLAN 167
- Monitoring Voice VLAN 171
- 160 OL-29440-01 174
- OL-29440-01 IN-1 175
- IN-2 OL-29440-01 176
- OL-29440-01 IN-3 177
- IN-4 OL-29440-01 178
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