In this situation, the source MAC addresses of IGMP joins are learned. However, source MAC addresses of IGMP joins are usually not learned by the switch in order to conserve MAC address space.
Possible Cause
Receiving joins and performing an ISSU simultaneously might cause the situation.
Solution
The MAC addresses age out (expire) if the join stops. Alternatively, you can clear the MAC addresses specifically by using the clear mac address-table dynamic mac <mac> command.
Possible Cause
Receiving joins and performing an ISSU simultaneously might cause the situation.
Solution
The MAC addresses age out (expire) if the join stops. Alternatively, you can clear the MAC addresses specifically by using the clear mac address-table dynamic mac <mac> command.
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