Manual

Layer 2 Tunnel Protocol Version 3
How to Configure Layer 2 Tunnel Protocol Version 3
53
Cisco IOS Releases 12.0(29)S and 12.2(25)S
Configuring Protocol Demultiplexing for L2TPv3
The Protocol Demultiplexing feature introduces the ability to provide native IPv6 support by utilizing a
specialized IPv6 network to offload IPv6 traffic from the IPv4 network. IPv6 traffic is transparently
tunneled to the IPv6 network using L2TPv3 pseudowires without affecting the configuration of the CE
routers. IPv4 traffic is routed as usual within the IPv4 network, maintaining the existing performance
and reliability of the IPv4 network.
The IPv4 PE routers must be configured to demultiplex incoming IPv6 traffic from IPv4 traffic. The PE
routers facing the IPv6 network do not require demultiplexing configuration. The configuration of the
IPv6 network is beyond the scope of this document. For more information on configuring an IPv6
network, refer to the Cisco IOS IPv6 Configuration Library.
Perform one of the following tasks on the customer-facing IPv4 PE routers to enable IPv6 protocol
demultiplexing:
• Configuring Protocol Demultiplexing for Ethernet Interfaces, page 54
• Configuring Protocol Demultiplexing for Frame Relay Interfaces, page 55
Step 6
xconnect peer-ip-address vcid
pw-class pw-class-name
Example:
Router(config-atm-vc)# xconnect
10.0.3.201 888 pw-class
atm-xconnect
Specifies the IP address of the peer PE router and the 32-bit VCI shared
between the PE at each end of the control channel.
• The peer router ID (IP address) and virtual circuit ID must be a unique
combination on the router.
• pw-class pw-class-name—The pseudowire class configuration from
which the data encapsulation type (L2TPv3) will be taken. The pw-class
parameter binds the Xconnect statement to a specific pseudowire class.
The pseudowire class then serves as the template configuration for all
attachment circuits bound to it.
Note The L2TPv3 session can also be provisioned manually. See the section
“Manually Configuring L2TPv3 Session Parameters” for information
about manually configuring the L2TPv3 session parameters.
Step 7
oam-ac emulation-enable
[ais-rate]
Example:
Router(config-atm-vc)# oam-ac
emulation-enable 30
Enables OAM cell emulation on AAL5 over L2TPv3.
• The oam-ac emulation-enable command lets you specify the rate at
which AIS cells are sent. The default is one cell every second. The range
is 0 to 60 seconds.
Command or Action Purpose