Cisco ASR 900 Series Release Notes page 82

Caveats in Cisco IOS XE 3.6S Releases
Symptoms: The OC-3 interface module crashes when you perform multiple RSP switchovers.
Conditions: Occurs when the router is running a CEM configuration configured at full scale on all
ports and passing traffic.
Workaround: There is no workaround.
CSCty51175
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Symptoms: Serial interfaces configured with HDLC display false LOF or AIS alarms.
Conditions: Occurs when you configure a high volume of serial interfaces using HDLC.
Workaround: Remove and re-apply the serial interface configuration.
CSCty51257
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Symptoms: The T1/E1 interface module changes to inserted state during an in-service software
upgrade (ISSU), causing the interface to fail and the router to generate a core file.
Conditions: Occurs when you perform an in-service software upgrade (ISSU) on a router with a
T1/E1 interface module.
Workaround: Issue the shutdown command on the interface module before beginning ISSU; after
ISSU is complete, issue the no shutdown command on the interface module.
CSCty51984
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Symptoms: CEM circuits become inactive.
Conditions: Occurs when you perform an OIR, reload, or when you reconfigure a CEM circuit on
the router. The issue occurs more consistently when the router is running more than 300 CEM
circuits.
Workaround: Issue the clear xconnect all command.
CSCty51990
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Symptoms: The router may crash or restart; the console displays a
Conditions: Occurs under the following conditions:
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Workaround: There is no workaround.
CSCty57746
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Symptoms: The show environment command displays incorrect values, including P0 and P1
voltages, PSU status, PSU voltage, and critical alarms.
Conditions: Occurs when you apply the show environment command.
Workaround: There is no workaround.
CSCty57751
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Symptoms: The router crashes.
Conditions: Occurs under any of the following conditions:
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Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
24
The router is configured with 63 or more instances of a unique EVC configured with a unique
bridge domain interface (BDI).
The router is sending IGMP joins to one multicast group.
You perform a shutdown/no shutdown on the interface sending IGMP join messages.
You perform an OIR on the router.
You perform an OIR on an interface module.
You issue the no ppp multilink command on all MLP member links.
Chapter Restrictions and Caveats in Cisco IOS XE 3.6S Releases
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