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Cisco Bug: CSCuo10325 - igmp snooping flooded on stp blocking after stp change

Last Modified

Nov 27, 2020

Products (2)

  • CiscoPro Workgroup EtherSwitch Software
  • CiscoPro Workgroup EtherSwitch Software

Known Affected Releases

5.1(3)N2(1a)

Description (partial)

Symptom:IGMP reports are forwarded to router ports even if the port is in blocking state

Conditions:Can happen if the port was originally in forwarding state and was learnt as a router port. And some change in STP topo causes the router port to go into blocking state. But the port is not removed from IGMP snoopings router port list. So until the router port gets timed out, any report received on this vlan, will be forwarded out of this blocked port as well.
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