Cisco ASR 900 Series Release Notes page 196

Caveats in Cisco IOS XE 3.8S Releases
CSCub61344
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Symptom: Link Control Protocol (LCP) negotiation fails, causing an MLP bundle to stop passing
traffic.
Conditions: Occurs under the following conditions:
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Workaround: Follow these steps:
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CSCud04161
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Symptom: The router incorrectly displays a CFM Delay Measurement Message (DMM) value of 0.
Conditions: Occurs under any of the following conditions:
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Workaround: Wait for PTP to synchronize before configuring DMM scheduling.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
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The router is configured with a T1 interface on the OC-3 interface module (IM)
The OC-3 interface module uses SONET framing
The T1 serial interface is part of an MLP bundle
You change the CRC configuration value of the MLP bundle
Remove the T1 interface from the MLP bundle.
Perform a soft OIR (IM reset) on both ends of the connection.
Wait for the T1 interface to become active.
Add the T1 interface back into the MLP bundle.
You dynamically add a member link to a port-channel.
You issue a shutdown/no shutdown on a member link of a port-channel.
Chapter
OL-26630-12