Cisco ASR 900 Series Release Notes

13
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-12
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:
– 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
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 ASR 900 Series Specifications

General

Brand	Cisco
Model	ASR 900 Series
Category	Network Router
Language	English