Cisco ASR 900 Series Release Notes page 205

Caveats in Cisco IOS XE 3.9S Releases
Workaround: Use the shutdown and no shutdown commands on the controller.
CSCuf89767
•
Symptom: When IGMP snooping is enabled, multicast traffic is not accurately filtered. Layer 3
multicast traffic floods all ports of the bridge-domain.
Conditions: This issue occurs when start-up configuration includes port channels along with
TEFP/EFP as part of the bridge-domain.
Workaround: There is no workaround.
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
9
OL-26630-12