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Why is a port seen as an igmp snooping router port

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TitleWhy is a port seen as an igmp snooping router port
Question
Why is a port seen as an igmp snooping router port
Environment
  • All EXOS
  • igmp snooping
Answer
IGMP snooping determines a router port based on the reception of a packet with below destination addresses (only if it is not a report and also not a leave):
  • 224.0.0.2 (All routers) 
  • 224.0.0.4 (DVMRP) 
  • 224.0.0.5 (OSPF) 
  • 224.0.0.6 (OSPF) 
  • 224.0.0.9 (RIP2) 
  • 224.0.0.10 (IGRP) 
  • 224.0.0.13 (PIM) 
  • 224.0.0.15 (CBTROUTERS) 
  • 224.0.0.18 (VRRP) 
  • 224.0.0.22 (IGMPv3)
You can change the detection of a router port by enabling igmp snooping forward-mcrouter-only
  enable igmp snooping forward-mcrouter-only

Another method to prevent a port becoming a router port is to block above groups with an ACL.
Additional notes

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