Cisco ASR 903 Release Notes page 190

Limitations and Restrictions
Multicast is not supported on OC-12 interfaces.
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DS0 channelization is not currently supported.
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MPLS is supported only on PoS 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 for 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 two-level QoS policies.
The Synchronization Status Message (SSM) is not currently on OC-3 and OC-12 interfaces.
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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 features are not currently supported on pseudowire connections:
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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
• Ethernet port to ATM AAL5 PVC L2VPN Interworking (bridged and routed modes)
• MIB support including PW-TDM-MIB, PW-ATM-MIB, and PW-CESOPSN-MIB
• N:1 PVC Mapping with non-unique VPI (N>1)
QoS Limitations
For a description of QoS features and limitations on the Cisco ASR 903 Router in Release 3.9S, see
http://www.cisco.com/en/US/docs/routers/asr903/software/guide/chassis/Release3.9.0S/ASR903-Chas
sis-SW-39.html
Software Upgrade Limitation
We recommend you set the interface-module-delay value to 150 or greater in order to ensure sufficient
time for IM software upgrades.
Subinterfaces Limitation
The Cisco ASR 903 Router does not support subinterface configurations except on ATM interfaces.
You can configure similar functionality using multiple Ethernet Virtual Connections on an interface.
For more information, see
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
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Ethernet VLAN to Ethernet VLAN L2VPN interworking (bridged and routed modes)
Ethernet VLAN to ATM AAL5 L2VPN Interworking (bridged and routed modes)
Configuring Ethernet Virtual Connections on the Cisco ASR 903 Router.
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