Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling

Default Layer 2 Protocol Tunneling Configuration

access ports in the same metro VLAN. Therefore, the Layer 2 PDUs remain intact and are delivered across the service-provider infrastructure to the other side of the customer network.

See the Layer 2 Protocol Tunneling figure in Layer 2 Protocol Tunneling Overview, on page 129, with Customer X and Customer Y in access VLANs 30 and 40, respectively. Asymmetric links connect the customers in Site 1 to edge switches in the service-provider network. The Layer 2 PDUs (for example, BPDUs) coming into Switch B from Customer Y in Site 1 are forwarded to the infrastructure as double-tagged packets with the well-known MAC address as the destination MAC address. These double-tagged packets have the metro VLAN tag of 40, as well as an inner VLAN tag (for example, VLAN 100). When the double-tagged packets enter Switch D, the outer VLAN tag 40 is removed, the well-known MAC address is replaced with the respective Layer 2 protocol MAC address, and the packet is sent to Customer Y on Site 2 as a single-tagged frame in VLAN 100.

You can also enable Layer 2 protocol tunneling on access ports on the edge switch connected to access or trunk ports on the customer switch. In this case, the encapsulation and decapsulation process is the same as described in the previous paragraph, except that the packets are not double-tagged in the service-provider network. The single tag is the customer-specific access VLAN tag.

In switch stacks, Layer 2 protocol tunneling configuration is distributed among all stack members. Each stack member that receives an ingress packet on a local port encapsulates or decapsulates the packet and forwards it to the appropriate destination port. On a single switch, ingress Layer 2 protocol-tunneled traffic is sent across all local ports in the same VLAN on which Layer 2 protocol tunneling is enabled. In a stack, packets received by a Layer 2 protocol-tunneled port are distributed to all ports in the stack that are configured for Layer 2 protocol tunneling and are in the same VLAN. All Layer 2 protocol tunneling configuration is handled by the stack master and distributed to all stack members.

Related Topics

Configuring Layer 2 Protocol Tunneling, on page 135

Example: Configuring Layer 2 Protocol Tunneling, on page 144

Default Layer 2 Protocol Tunneling Configuration

The following table shows the default Layer 2 protocol tunneling configuration.

Table 14: Default Layer 2 Ethernet Interface VLAN Configuration

Feature

Default Setting

Layer 2 protocol tunneling

Disabled.

Shutdown threshold

None set.

Drop threshold

None set.

CoS Value

If a CoS value is configured on the interface, that

 

value is used to set the BPDU CoS value for Layer 2

 

protocol tunneling. If no CoS value is configured at

 

the interface level, the default value for CoS marking

 

of L2 protocol tunneling BPDUs is 5. This does not

 

apply to data traffic.

 

Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1

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Cisco Systems WSC2960XR48FPSI manual Default Layer 2 Protocol Tunneling Configuration, Related Topics
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WSC2960XR48FPSI specifications

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