Cisco ASR 900 Series Release Notes page 132

Caveats in Cisco IOS XE 3.7S Releases
CSCuc99908
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Symptom: IEEE 802.1S Multiple STP (MSTP) convergence takes more than 4.1 seconds.
Conditions: Occurs under the following conditions:
–
–
–
Workaround: To achieve a convergence time of approximately 900 milliseconds with 1000 VLANs
on an Ethernet interface, configure MSTP on a trunk EFP.
CSCud01908
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Symptom: Debug commands show pending objects on the Forwarding Manager (FMAN) on the
forwarding processor (FP), indicating a failure to download configurations from the Route Switch
Processor (RSP) to the data plane (DP).
Conditions: Occurs when you apply a QoS shaping configuration at a high scale.
Workaround: Delete the QoS policies and remove the QoS configuration from the interface.
CSCud04529
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Symptom: The router can drop traffic for approximately 300 milliseconds.
Conditions: The issue occurs in rare instances when the router is configured in a ring topology with
loop-free alternate (LFA) IP fast reroute (IPFRR) and the primary path recovers from a down state.
Workaround: There is no workaround.
CSCud07642
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Symptom: The ASR 903 is unable to pass traffic to the ASR 9000.
Conditions: Occurs with a clear-channel ATM over MPLS configuration using AAL0
encapsulation.
Workaround: Enable MPLS control-word on the ASR 9000.
CSCud11843
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Symptom: The router displays a CPU hog error message and crashes.
Conditions: Occurs when you issue an RSP switchover following an interface flap on the 10 Gigabit
Ethernet interface module (IM).
Workaround: The issue does not occur in the absence of in interface flap on the 10 Gigabit Ethernet
IM.
CSCud15785
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Symptom: The router experiences flapping on REP connections.
Conditions: Occurs under the following conditions:
–
–
Workaround: Increase the REP timer to above 500 milliseconds or disable the MAC limiting
feature.
CSCud19845
•
Symptom: The router drops ping packets over VPN Routing and Forwarding (VRF) connections.
Conditions: Occurs when you specify a packet size using the size parameter.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
44
An Ethernet interface is acting as the Root forwarding MST port
The Ethernet interface is configured with more than 1000 EVCs
You perform a shutdown/no shutdown on the interface.
MAC limiting is enabled and a MAC address is at the maximum value
REP is configured with a 200 millisecond LSL ageout timer
Chapter
OL-26630-12