White Papers

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 Dell Networking OS Configuration Guide.
This chapter includes commands for the Dell Networking operating software Layer 2 Protocol Tunneling (L2PT). L2PT enables
protocols to tunnel through an 802.1q tunnel.
For more information, see 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, see 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.
Topics:
• debug protocol-tunnel
• protocol-tunnel
• protocol-tunnel destination-mac
• protocol-tunnel enable
• protocol-tunnel rate-limit
• show protocol-tunnel
debug protocol-tunnel
Enable debugging to ensure incoming packets are received and rewritten to a new MAC address.
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.
in | out | both Enter the keyword in, out, or both to debug incoming interfaces, outgoing
interfaces, or both incoming and outgoing interfaces.
vlan vlan-id Enter the keyword vlan then the VLAN ID. The range is from 1 to 4094.
count value Enter the keyword count then the number of debug outputs. The range is from 1
to 100.
54
1078 Service Provider Bridging