The system supports the following tunnel protocols:

• Link Layer Discovery Protocol (LLDP)

• Link Aggregation Control Protocol (LACP)

• Operation, Administration, Management (OAM)

• Ethernet Local Management Interface (ELMI)

• Cisco Discovery Protocol (CDP)

On a subinterface, when control packets such as LLDP and LACP are tunneled, the system tunnels the same control packets to the main interface.

The LACP packet for VPLS also known as E-LAN service either gets peered or dropped. LACP tunneling is not supported for VPLS service. Tunneling of LACP packets is supported only for VPWS and EVPN-VPWS services.

The router allows to tunnel layer 2 packets between CEs. The following figure depicts Layer 2 Protocol Tunneling. The layer 2 traffic is sent through the S-network, and the S-network switches the traffic from end-to-end. Third-party PE forwards S-tagged frames and peers untagged frames.

The router supports layer 2 peering functionalities on a per EthernetFlow Point (EFP) basis. It supports a maximum packet rate of 10 packets ps (per interface) for a protocol, and 100 packets ps for all protocols (on all interfaces).

You do not need to configure L2CP tunneling explicitly. L2CP packets are tunneled over Layer 2 tunnel by default.

The following table lists the options that are supported on the router and displays the supported defaults and configuration options for the router.

The following table lists the supported options on the router and displays the supported defaults and configuration options for the NC57 line cards.

Note	L2CP protocols over BVI is not supported. L2CP protocol on NC57 line cards is supported from Release 7.6.1.