Reference Guide

Service Provider Bridging

Service provider bridging is composed of virtual local area network (VLAN) Stacking, Layer 2 Protocol Tunneling, and

Provider Backbone Bridging as described in the

FTOS Configuration Guide Service Provider Bridging

chapter.

This chapter includes command line information (CLI) for the Dell Networking operating software (FTOS) Layer 2

Protocol Tunneling (L2PT). L2PT enables protocols to tunnel through an 802.1q tunnel.

FTOS supports L2PT on the S4820T platform.

For more information, refer to VLAN Stacking, Spanning Tree Protocol (STP), and GARP VLAN Registration (GVRP).

Important Points to Remember

• L2PT is enabled at the interface VLAN-Stack VLAN level. For more information about Stackable VLAN (VLAN-

Stacking) commands, refer to VLAN Stacking.

• The default behavior is to disable protocol packet tunneling through the 802.1q tunnel.

• Rate-limiting is required to protect against bridge protocol data units (BPDU) attacks.

• A port channel (including through link aggregation control protocol [LACP]) can be configured as a VLAN-Stack

access or trunk port.

• Address resolution protocol (ARP) packets work as expected across the tunnel.

• Far-end failure detection (FEFD) works the same as with Layer 2 links.

• Protocols that use Multicast MAC addresses (for example, open shortest path first [OSPF]) work as expected

and carry over to the other end of the VLAN-Stack VLAN.

debug protocol-tunnel

Enable debugging to ensure incoming packets are received and rewritten to a new MAC address.

S4820T

Syntax

debug protocol-tunnel interface {in | out | both} [vlan vlan-

id] [count value]

To disable debugging, use the no debug protocol-tunnel interface {in |

out | both} [vlan vlan-id] [count value] command.

Parameters

interface Enter one of the following interfaces and slot/port information:

• For a Port Channel interface, enter the keywords port-

channel then a number. The range is from 1 to 128.

• For a 10-Gigabit Ethernet interface, enter the keyword

TenGigabitEthernet then the slot/port information.

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