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35-7
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 35 Layer 2 Control Protocol Peering, Forwarding, and Tunneling
How to Configure Layer 2 Control Protocol Peering, Forwarding, and Tunneling
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
Step 6
encapsulation untagged
Example:
Router(config-if-srv)# encapsulation
untagged
Defines the matching criteria to map untagged ingress Ethernet
frames on an interface to the appropriate service instance.
Step 7
l2protocol forward [
protocol]
Example:
Router(config-if-srv)# l2protocol forward
cdp
Enables forwarding of untagged packets of specified protocol in a
service instance.
• protocol—The protocol to be used. The options are: cdp, dtp,
lacp, lldp, stp,and vtp.
Step 8
bridge-domain
bridge-id
Example:
Router(config-if-srv)# bridge-domain 200
Binds a service instance to a bridge domain instance.
• bridge-id—Identifier for the bridge domain instance.
Command Purpose