Cisco ASR 900 Series Release Notes

44
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-12
Chapter
Caveats in Cisco IOS XE 3.7S Releases
• CSCuc99908
Symptom: IEEE 802.1S Multiple STP (MSTP) convergence takes more than 4.1 seconds.
Conditions: Occurs under the following conditions:
– 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.
Workaround: To achieve a convergence time of approximately 900 milliseconds with 1000 VLANs
on an Ethernet interface, configure MSTP on a trunk EFP.
• CSCud01908
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
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
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
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
Symptom: The router experiences flapping on REP connections.
Conditions: Occurs under the following conditions:
– MAC limiting is enabled and a MAC address is at the maximum value
– REP is configured with a 200 millisecond LSL ageout timer
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 ASR 900 Series Specifications

General

Brand	Cisco
Model	ASR 900 Series
Category	Network Router
Language	English