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.