Cisco Systems A9014CFD manual Configuring Layer 2 Tunneling, 35-7

Chapter 35 Layer 2 Control Protocol Peering, Forwarding, and Tunneling

How to Configure Layer 2 Control Protocol Peering, Forwarding, and Tunneling

	Command	Purpose
Step 6	encapsulation untagged	Defines the matching criteria to map untagged ingress Ethernet
		frames on an interface to the appropriate service instance.
	Example:
	Router(config-if-srv)# encapsulation
	untagged
Step 7	l2protocol forward [protocol]	Enables forwarding of untagged packets of specified protocol in a
		service instance.
	Example:	• protocol—The protocol to be used. The options are: cdp, dtp,
	Router(config-if-srv)# l2protocol forward	lacp, lldp, stp,and vtp.
	cdp
Step 8	bridge-domain bridge-id	Binds a service instance to a bridge domain instance.
		• bridge-id—Identifier for the bridge domain instance.
	Example:
	Router(config-if-srv)# bridge-domain 200

Configuring Layer 2 Tunneling

The ASR 901 router supports layer 2 control protocol tunneling functionality on a per EFP basis. This functionality is supported for tagged and untagged packets based on CDP, DTP, LACP, LLDP, STP, and VTP protocols.

If an EFP is configured for layer 2 control protocol tunneling, then:

•Any L2CP packet coming on the EFP is forwarded to the bridge domain (BD) with Cisco proprietary multicast address (01-00-0c-cd-cd-d0).

•Any packet coming on the BD with Cisco proprietary multicast address (01-00-0c-cd-cd-d0) is stamped with well known L2CP MAC address (on EFP which has layer 2 protocol tunneling configured).

•A packet with Cisco proprietary multicast address is forwarded as is if l2protocol tunnel is not configured.

Complete the following steps to configure layer 2 tunneling:

Restrictions

•Layer 2 control protocol tunneling is not supported on x-connect EFPs, and at the interface level.

•Tunneling functionality is not supported with dot1q VLAN range encapsulation.

•Layer 2 control protocol tunneling supports a maximum packet rate of 10 packets ps (per interface) for a protocol, and 100 packets ps for all protocols (on all interfaces).

SUMMARY STEPS

1.enable

2.configure terminal

3.interface type number

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		35-7