• Cisco Discovery Protocol (CDP)—CDP is protocol-independent and is used to obtain protocol addresses,
platform information, and other data about neighboring devices.
•
PVST maintains a spanning tree instance for each VLAN configured in the network and permits a VLAN
trunk to be forwarding for some VLANs and not for others. It can also load balance Layer 2 traffic by
forwarding some VLANs on one trunk and other VLANs n others.
• Spanning-Tree Protocol (STP)—STP is a link management protocol that provides path redundancy in
the network. For Ethernet networks to function properly, only one active path can exist between two
stations.
• VLAN Trunk Protocol (VTP)—VTP is a Cisco-proprietary protocol that reduces administration in a
switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed
through all switches in the domain.
Task ID
OperationsTask ID
read, writel2vpn
read, writeatm
Examples
The following example shows how to configure Layer 2 protocol handling:
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface GigabitEthernet 0/0/0/0
RP/0/RSP0/CPU0:router(config-if)# l2transport l2protocol cpsv reverse-tunnelstp drop
Related Commands
DescriptionCommand
Displays forwarding information from the layer2_fib manager
on the line card.
show l2vpn forwarding, on page 170
Cisco ASR 9000 Series Aggregation Services Router VPN and Ethernet Services Command Reference, Release
6.1.x
95
Point to Point Layer 2 Services Commands
l2transport l2protocol
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