Administrator Guide

Implementation Information
• L2PT is available for STP, RSTP, MSTP, and PVST+ BPDUs.
• No protocol packets are tunneled when you enable VLAN stacking.
• L2PT requires the default CAM profile.
Enabling Layer 2 Protocol Tunneling
To enable Layer 2 protocol tunneling, use the following command.
1 Verify that the system is running the default CAM profile. Use this CAM profile for L2PT.
EXEC Privilege mode
show cam-profile
2 Enable protocol tunneling globally on the system.
CONFIGURATION mode
protocol-tunnel enable
3 Tunnel BPDUs the VLAN.
INTERFACE VLAN mode
protocol-tunnel stp
Specifying a Destination MAC Address for
BPDUs
By default, the Dell Networking OS uses a Dell Networking-unique MAC address for tunneling BPDUs. You
can configure another value.
To specify a destination MAC address for BPDUs, use the following command.
• Overwrite the BPDU with a user-specified destination MAC address when BPDUs are tunneled across the
provider network.
CONFIGURATION mode
protocol-tunnel destination-mac
The default is 01:01:e8:00:00:00
Setting Rate-Limit BPDUs
CAM space is allocated in sections called field processor (FP) blocks.
There are a total of 13 user-configurable FP blocks. The default number of blocks for L2PT is 0; you must
allocate at least one to enable BPDU rate-limiting.
Service Provider Bridging 827