line card. The egress line card then transmits the packet through the MPLS core. On the remote PE, the MPLS
label is removed, Layer 2 header of the egress AC is added and finally the packet is sent to the connected CE.
L2VPN VPWS has been enhanced to support:
• Point-to-Point Protocol (PPP)
• High-level Data Link Control (HDLC)
• Multilink Point-to-Point Protocol (MLPPP)
• QOS support for all the encapsulation types
For more information on QoS, see the Cisco ASR 9000 Series Aggregation Services Router Modular
Quality of Service Configuration.
The TDM ACs can be configured on these SPAs:
• SPA-8XCHT1/E1
• SPA-4XCT3/DS0
• SPA-1XCHSTM1/OC3
• SPA-2XCHOC12/DS0
• SPA-1XCHOC48/DS3
• SPA-4XT3/E3
• SPA-4XOC3-POS-V2
• SPA-8XOC3-POS
• SPA-8XOC12-POS
• SPA-1XOC48POS/RPR
• SPA-2XOC48POS/RPR
Any Transport over MPLS
Any Transport over MPLS (AToM) transports Layer 2 packets over a Multiprotocol Label Switching (MPLS)
backbone. This enables service providers to connect customer sites with existing Layer 2 networks by using
a single, integrated, packet-based network infrastructure. Using this feature, service providers can deliver
Layer 2 connections over an MPLS backbone, instead of using separate networks.
AToM encapsulates Layer 2 frames at the ingress PE router, and sends them to a corresponding PE router at
the other end of a pseudowire, which is a connection between the two PE routers. The egress PE removes the
encapsulation and sends out the Layer 2 frame.
The successful transmission of the Layer 2 frames between PE routers is due to the configuration of the PE
routers. You set up a connection, called a pseudowire, between the routers. You specify this information on
each PE router:
• The type of Layer 2 data that will be transported across the pseudowire, such as Ethernet and Frame
Relay
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
86
Implementing Point to Point Layer 2 Services
Any Transport over MPLS
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