Cisco ASR 903 Release Notes page 134

Caveats in Cisco IOS XE 3.7S Releases
CSCty28986
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Symptoms: A configuration with a high number of down MEPs does not function properly.
Conditions: Occurs when you configure 500 or more down MEPs with 500 or more xconnect
configurations between service instances.
Workaround: Configure no more than 200 CFM sessions.
CSCty34054
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Symptoms: The router displays CPU utilization traceback messages and drops all multicast traffic
for 2050 seconds.
Conditions: Occurs under the following conditions:
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Workaround: There is no workaround.
CSCty51990
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Symptoms: The router may crash or restart; the console displays a SW_WDOG: expired message.
Conditions: Occurs under the following conditions:
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Workaround: There is no workaround.
CSCty70119
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Symptoms: Port shaper rate changes do not take effect.
Conditions: Occurs when QoS policies attached to EVCs on an interface do not include a shaper
configuration; the issue does not occur on EFP policies that include a shaper in a class.
Workaround: Include a shaper in one class of the EFP policy.
CSCty73362
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Symptoms: The router experiences CPP download failures when sending IGMP join messages.
Conditions: Occurs when the router is configured with a trunk EFP in SM mode on the access side
and is sending IGMP join messages to more than 1970 multicast groups.
Workaround: There is no workaround.
CSCty74115
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Symptoms: The router displays traceback and CPU error messages.
Conditions: Occurs when you configure a high number of MAC address table entries while REP is
enabled; the router displays errors during a REP topology change, REP preemption, or when you
perform a shutdown/no shutdown on an interface.
Workaround: Reduce the MAC scale.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
52
Multicast is enabled with more than 500 multicast groups
The router is using RSP1B in SSM mode
BDI is configured on the access side of the router
There are 24 EFPs on each bridge domain
You enter a shutdown command on the access interface.
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.
Chapter
OL-26630-08