Symptom
Multicast traffic flows through the MCT link (vpc peer-link) even though VPC Multicast optimization is enabled using CLI "no ip igmp snooping mrouter vpc peer-link".
Conditions
VPC Multicast optimization is enabled using CLI -
"no ip igmp snooping mrouter vpc peer-link"
Workaround
If vPc multicast optimization is required such that multicast traffic doesn't traverse MCT link and if this issue is observed in the network, enabling the command by configuring "ip igmp snooping mrouter vpc peer-link" and disabling the command after some time by using "no ip igmp snooping mrouter vpc peer-link" will work.
Further Problem Description
Enabling Multicast optimisation through CLI doesn't take effect in a scale setup. No issue is seen if we do not enable VPC Multicast optimization. It is disabled by default.
