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7.8.1.0 - Force10 Networks

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For configuration details on using VLAN-Stacking ports for carrying single-tagged VLANs and for<br />

carrying untagged traffic, see the following configuration examples:<br />

• Making a port a trunk port and part of a single-tagged VLAN on page 762<br />

• Making a hybrid port a trunk port and a member of other VLANs on page 763<br />

• Configuring an E-Series VLAN-Stack trunk port to tunnel customer BPDUs on page 764<br />

BPDU Tunneling<br />

The Layer 2 Protocol Tunneling (L2PT) feature is only available on the E-Series: e<br />

By default, when VLAN Stacking is enabled, Spanning Tree BPDUs and other Layer 2 protocol data units<br />

are dropped. Such control frames use well-known MAC addresses, which, per IEEE guidelines, should be<br />

consumed by each device on which the frames are received.<br />

However, in some cases, there is a need to transport that control traffic transparently through the core to<br />

another region. L2PT solves this issue by matching on the well-known MAC address and forwarding the<br />

frames to a local CPU, which in turn rewrites the MAC address to <strong>Force10</strong>'s unique MAC address<br />

(01-01-e8-00-00-00) and transmits the frame back into the VLAN-Stacking core. Since the frames now use<br />

<strong>Force10</strong>'s unique MAC address, they are treated as normal data packets by other VLAN-Stacking core<br />

switches. At the egress customer-provider edge, the MAC address of the frames is again rewritten to the<br />

original MAC address and forwarded to the customer network.<br />

Important Points to Remember<br />

• STP, RSTP, and MSTP BPDUs are supported. (PVST+ is not supported.)<br />

For details on L2PT commands, refer to the Layer 2 Protocol Tunneling chapter in the FTOS Command<br />

Reference for the E-Series.<br />

Configuration Task List for VLAN-Stack VLANs<br />

The following list has the configuration tasks for VLAN-Stack VLANs:<br />

• Configuring a VLAN-Stack access port on page 755 (mandatory)<br />

• Configuring a VLAN-Stack trunk port on page 755 (mandatory)<br />

• Configuring a VLAN-Stack VLAN on page 756 (mandatory)<br />

• Setting the protocol type for VLAN-Stack VLANs on page 757 (optional)<br />

• Configuring Layer 2 protocol tunneling (E-Series) on page 757 (optional)<br />

• Verifying and debugging the configuration on page 766<br />

754 VLAN Stacking

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