Cisco ASR 903 Release Notes page 146

Limitations and Restrictions
Multicast is not supported on POS, MLPPP and OC-12 interfaces.
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MPLS is supported only on PoS and MLPPP interfaces; MPLS on T1/E1 links is not supported.
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IP-FRR and BFD-triggered FRR are not supported on MPLS over POS links.
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Fragmentation is not supported with Multicast traffic on PoS interfaces.
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QoS is not supported with Multicast traffic on PoS interfaces.
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QoS is supported on POS interfaces on optical interface module.
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Three-level QoS policies are not supported on OC-3/OC-12 serial, MLPPP, and PoS interfaces. You
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can only apply QoS policies on two levels on these interfaces.
Pseudowire/AToM Limitation
The Cisco ASR 903 Router supports ATM over MPLS N-to-one cell mode for a single ATM Virtual
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Channel Connections (VCCs) or Permanent Virtual Circuits (PVCs) to a pseudowire, but does not
support mapping to multiple VCCs or PVCs.
The Cisco ASR 903 Router does not support ATM over MPLS one-to-one cell mode.
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The Cisco ASR 903 Router supports pseudowire ping using the CW method; pseudowire ping using
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the TTL method is not supported.
The Cisco ASR 903 Router supports a maximum of 2000 pseudowires in any combination.
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The following pseudowire (PW) features are supported over MPLS-TP connections:
ATM over MPLS PWs
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ATM attachment circuits
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AAL5 Encapsulation
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ATM VC Class Support
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Cell Relay including VC mode, VP mode, and Packed Cell Relay
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CESoPSN
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• L2VPN pseudowire redundancy
• Multi-segment PWs
• PW OAM/Status TLV Support
• PW Redundancy
SAToP
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The following pseudowire (PW) features are not supported over MPLS-TP connections:
ATM OAM Cell Emulation for ATM AAL5 over MPLS on PVC and in VC Class.
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BFD / VCCV over ATM AC over MPLS TP
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BFD/ VCCV over TDM PW over MPLS TP Manageability
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Ethernet VLAN to Ethernet VLAN L2VPN interworking (bridged and routed modes)
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Ethernet VLAN to ATM AAL5 L2VPN Interworking (bridged and routed modes)
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Ethernet port to ATM AAL5 PVC L2VPN Interworking (bridged and routed modes)
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Layer 2 QoS features such as classifying or marking based on an L2 value
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• MIB support including PW-TDM-MIB, PW-ATM-MIB, and PW-CESOPSN-MIB
• N:1 PVC Mapping with non-unique VPI (N>1)
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
4
Chapter
OL-26630-08