Cisco Cisco IOS Software Release 12.0(27)S

12.0(10)ST

Any Transport over MPLS: ATM AAL5 over MPLS was introduced on the Cisco 
12000 series routers.

12.1(8a)E

Any Transport over MPLS: Ethernet over MPLS was introduced on the Cisco 7600 
series Internet router.

12.0(21)ST

Ethernet over MPLS was introduced on the Cisco 12000 series routers. ATM AAL5 
over MPLS was updated. 

12.0(22)S

Ethernet over MPLS was integrated into this release. Support for the Cisco 10720 
router was added. ATM AAL5 over MPLS was integrated into this release for the 
Cisco 12000 series routers.

12.0(23)S

The following new features were introduced:

ATM Cell Relay over MPLS (single cell relay, VC mode)

Frame Relay over MPLS

HDLC over MPLS

PPP over MPLS

These features were supported on the Cisco 7200 and 7500 series routers.

The Cisco 12000, 7200, and 7500 series routers supported the following features:

ATM AAL5 over MPLS

Ethernet over MPLS (VLAN mode)

The Cisco 10720 Internet router continued support for Ethernet over MPLS.

12.2(14)S

This feature was integrated into Cisco IOS Release 12.2(14)S. 

12.2(15)T

This feature was integrated into Cisco IOS Release 12.2(15)T. 

12.0(25)S

The following new features were introduced: 

New commands for configuring AToM

Ethernet over MPLS: port mode

ATM Cell Relay over MPLS: packed cell relay 

ATM Cell Relay over MPLS: VP mode 

ATM Cell Relay over MPLS: port mode

Distributed CEF mode for Frame Relay, PPP, and HDLC over MPLS

Fast reroute with AToM

Tunnel selection

Traffic policing

QoS support