Cisco Cisco IOS Software Release 12.0(29)S
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Cisco IOS Releases 12.0(29)S and 12.2(25)S
Layer 2 Tunnel Protocol Version 3
The Layer 2 Tunnel Protocol Version 3 feature expands on Cisco support of the Layer 2 Tunnel Protocol
Version 3 (L2TPv3). L2TPv3 is an Internet Engineering Task Force (IETF) l2tpext working group draft
that provides several enhancements to L2TP for the capability to tunnel any Layer 2 payload over L2TP.
Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network
using Layer 2 virtual private networks (VPNs). Benefits of this feature include the following:
Version 3 (L2TPv3). L2TPv3 is an Internet Engineering Task Force (IETF) l2tpext working group draft
that provides several enhancements to L2TP for the capability to tunnel any Layer 2 payload over L2TP.
Specifically, L2TPv3 defines the L2TP protocol for tunneling Layer 2 payloads over an IP core network
using Layer 2 virtual private networks (VPNs). Benefits of this feature include the following:
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L2TPv3 simplifies deployment of VPNs
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L2TPv3 does not require Multiprotocol Label Switching (MPLS)
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L2TPv3 supports Layer 2 tunneling over IP for any payload
Feature History for the Layer 2 Tunneling Protocol Version 3 Feature
Release
Modification
12.0(21)S
Initial data plane support for L2TPv3 was introduced on the Cisco 7200
series, Cisco 7500 series, Cisco 10720, and Cisco 12000 series platforms.
series, Cisco 7500 series, Cisco 10720, and Cisco 12000 series platforms.
12.0(23)S
L2TPv3 control plane support was introduced on the Cisco 7200 series,
Cisco 7500 series, Cisco 10720, and Cisco 12000 series platforms.
Cisco 7500 series, Cisco 10720, and Cisco 12000 series platforms.
12.0(24)S
L2TPv3 was enhanced to support fragmentation of IP packets before
entering the pseudowire on the Cisco 7200 series, Cisco 7500 series, and
Cisco 12000 series Internet routers.
entering the pseudowire on the Cisco 7200 series, Cisco 7500 series, and
Cisco 12000 series Internet routers.
12.0(25)S
Support was added for the ATM VP Mode Single Cell Relay over L2TPv3
feature on the Cisco 7200 and Cisco 7500 series routers with ATM Deluxe
PA-A3 interfaces.
feature on the Cisco 7200 and Cisco 7500 series routers with ATM Deluxe
PA-A3 interfaces.
12.0(23)S3
L2TPv3 control plane support was introduced on the Cisco 12000 series
One-Port Channelized OC-12(DS3) line card.
One-Port Channelized OC-12(DS3) line card.
12.0(24)S1
L2TPv3 control plane support was introduced on the Cisco 12000 series
One-Port Channelized OC-12(DS3) line card.
One-Port Channelized OC-12(DS3) line card.
12.0(25)S
L2TPv3 control plane support was introduced on the Cisco 12000 series
One-Port Channelized OC-12(DS3) line card.
One-Port Channelized OC-12(DS3) line card.
12.0(27)S
Support for the following features was added to Cisco 12000 series
Two-Port Channelized OC-3/STM-1 (DS1/E1) and Six-Port Channelized
T3 (T1) line cards:
Two-Port Channelized OC-3/STM-1 (DS1/E1) and Six-Port Channelized
T3 (T1) line cards:
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Quality of Service (QoS) for Frame Relay attachment circuits
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Binding L2TPv3 sessions to Multilink Frame Relay (MLFR) interfaces