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57
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-12
Chapter
Caveats in Cisco IOS XE 3.7S Releases
•
CSCty28986
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
Symptoms: The router displays CPU utilization traceback messages and drops all multicast traffic
for 2050 seconds.
Conditions: Occurs under the following conditions:
– 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.
Workaround: There is no workaround.
• CSCty51990
Symptoms: The router may crash or restart; the console displays a SW_WDOG: expired message.
Conditions: Occurs under the following conditions:
–
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.
Workaround: There is no workaround.
• CSCty70119
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
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
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.