Cisco ASR 900 Series Release Notes page 200

Limitations and Restrictions
MPLS VPN Limitation
MPLS VPN (L3VPN) Fragmentation does not function properly if an access interface has a higher
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MTU value than a core interface. To ensure that fragmentation functions correctly, configure the
core interface MTU with a value that exceeds the access interface MTU and relevant headers.
OC-3 IM Limitations
• The configure replace command is not supported on the OC-3 IMs.
• MPLS-TP is not supported over POS interfaces.
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
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• 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
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)
OL-26630-12