Manual

Layer 2 Tunnel Protocol Version 3
ip protocol
103
Cisco IOS Releases 12.0(29)S and 12.2(25)S
ip protocol
To configure the Layer 2 Tunnel Protocol (L2TP) or Universal Tunnel Interface (UTI) as the IP protocol
used for tunneling packets in an L2TP Version 3 (L2TPv3) pseudowire, use the ip protocol command in
pseudowire class configuration mode. To remove the IP protocol configuration, use the no form of this
command.
ip protocol {l2tp | uti | protocol-number}
no ip protocol {l2tp | uti | protocol-number}
Syntax Description
Defaults The default IP protocol is L2TP.
Command Modes Pseudowire class configuration
Command History
Usage Guidelines Use the ip protocol command to ensure backward compatibility with routers running UTI. This
command allows you to configure an L2TPv3 pseudowire between a router running L2TPv3 and a peer
router running UTI.
Note You can use the ip protocol command only if you have already entered the encapsulation l2tpv3
command.
To configure L2TP as the IP protocol used to tunnel packets in an L2TPv3 pseudowire, you may enter
115, the IP protocol number assigned to L2TPv3, instead of l2tp in the ip protocol command.
To configure UTI as the IP protocol used to tunnel packets in an L2TPv3 pseudowire, you may enter 120,
the IP protocol number assigned to UTI, instead of uti in the ip protocol command.
Note Interoperability in an L2TPv3 control channel between a router running UTI and a router configured for
L2TPv3 encapsulation is supported only if you disable signaling using the protocol none command.
l2tp Configures L2TP as the IP protocol used to tunnel packets in an L2TPv3
pseudowire.
uti Configures UTI as the IP protocol used to tunnel packets in an L2TPv3
pseudowire, and allows a router running L2TPv3 to interoperate with a peer
running UTI.
protocol-number The protocol number of the desired IP protocol. The protocol number for
L2TPv3 is 115. The protocol number for UTI is 120.
Release Modification
12.0(23)S This command was introduced.
12.2(25)S This command was integrated into Cisco IOS Release 12.2(25)S.