3
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-08
Chapter Restrictions and Caveats in Cisco IOS XE 3.6S Releases
Limitations and Restrictions
–
Packet counters on the bundle display the number of fragments rather than packets.
–
Control packets are accounted on the bundle.
• If you increase the maximum transmission unit (MTU) size on an MLPPP interface to a value higher
than the maximum received reconstructed unit (MRRU) value on the peer interface, this can bring
the MLPPP tunnel down. To restore the tunnel, perform a shutdown/no shutdown on the interface.
MPLS VPN Limitation
• MPLS VPN (L3VPN) Fragmentation does not function properly if an access interface has a higher
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
• SDH framing mode is supported; SONET is not supported.
• Channelization is not supported.
• The optical interface module is designed for OC-3 and OC-12 traffic, but OC-12 functionality is not
currently supported.
Pseudowire/AToM Limitation
• The Cisco ASR 903 Router supports ATM over MPLS N-to-one cell mode for a single ATM Virtual
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.
• The Cisco ASR 903 Router supports pseudowire ping using the CW method; pseudowire ping using
the TTL method is not supported.
• The Cisco ASR 903 Router supports a maximum of 2000 pseudowires in any combination.
QoS Limitations
For a description of QoS features and limitations on the Cisco ASR 903 Router in release 3.6S, see
http://www.cisco.com/en/US/docs/wireless/asr_900/software/guide/chassis/Release3.6.0S/ASR903-Ch
assis-SW-36.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.
Note You can configure similar functionality using multiple Ethernet Virtual Connections on an
interface. For more information, see Configuring Ethernet Virtual Connections on the Cisco
ASR 903 Router.
T1/E1 IM Limitations
• Inverting data on the T1/E1 interface is not supported—Inverting the data stream using the invert
data interface command is not supported.
To Next Page
Loading...
Need help?
General
