Cisco ASR 903 Release Notes page 198

Caveats in Cisco IOS XE 3.9S Releases
CSCuh18073
•
Symptom: In a domain with 2 BGP exit points acting in Active or Repair mode, traffic would be
exiting the domain through Repair path BGP PE instead of exiting through Active path BGP PE.
Conditions: This issue occurs in the following conditions:
–
–
In this scenario, even after BGP convergence, data packets would traverse through previous primary
BGP PE (now repair path PE).
Workaround: There is no workaround.
• CSCuh18503
Symptom: BFD IPv6 sessions may not come up between Cisco ASR 9000 and Cisco ASR 903
Routers.
Conditions: This issue is observed when the packets sent from Cisco ASR 903 Router have invalid
UDP checksums.
Workaround: There is no workaround.
• CSCuh27117
Symptom: Traffic loss of about six to eight seconds is observed when you perform an SSO.
Conditions: This issue is observed when you perform the switchover before IM OIR or the interface
flaps.
Workaround: There is no workaround.
CSCuh33255
•
Symptom: Traffic does not flow through most multilink PPP (MLP) interfaces post In-Service
Software Upgrade (ISSU).
Conditions: This issue occurs on HA system performing ISSU or killing IOMD process followed
by switchover.
Workaround: Use shutdown and no shutdown command on MLP interface to recover the traffic.
CSCuh59723
•
Symptom: On removing one out of the two member links from the MLP bundle, traffic and ping fail.
Conditions: This issue occurs with T1E1/OC-3 IM when using shutdown and no shutdown
command or when removing cable from one of the member serial interface.
Workaround: Reload the router.
CSCuh65426
•
Symptom: Circuit emulation (CEM) packets use class default after shutdown and no shutdown on
CEM circuit, with or without QoS policy
Conditions: After removing and adding QoS policy on CEM circuits, followed by CEM interface
flap, CEM packets neither exit with default EXP marking of 5 nor exit with the marking specified
in ingress qos policy. This occurs after reloading the router with policies intact on CEM interface
and only in the presence of Hot-Standby Psuedo Wires (HSPW).
Workaround: There is no workaround.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
12
Environment has 2 BGP exit points
A change in one of the core links to the primary BGP exit point results in Repair BGP PE
becoming Active BGP PE and vice versa
OL-26630-08