Multicast - Internet Group Management Protocol
6 important questions on Multicast - Internet Group Management Protocol
What versions of IGMP are there?
- IGMPv2 (Commonly used)
- IGMPv3 (Used by SSM)
IGMPv2 messages are encapsulated in an IP packet and send to the local router.
What is the IP protocol number used and what is special about the TTL?
The TTL is set to 1, this way it is only processed by the local router and never forwarded by any router.
What 2 modes does IGMPv3 use when sending a membership report to join a multicast group?
2. Exclude mode. Includes a list with sources it does NOT want to receive traffic from.
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What is IGMP snooping?
Which 2 methods can a Cisco switch use to reduce multicast flooding on LAN segments?
2. Static MAC address entries (not scalable)
What 2 mechanisms does IGMP snooping use to optimize forwarding of Multicast traffic?
2. Listens for IGMP membership reports messages from host to identify ports with interested receivers.
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