IP Multicasting: IGMP and Layer 2 Issues. BSCI Module 7 Lesson 2. Objectives. Explain the operations of IGMPv2 and how IGMPv2 utilizes Join Group and Leave Group messages. Explain the operations of IGMPv3 and how IGMPv2 and IGMPv3 interoperate.
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BSCI Module 7 Lesson 2
How hosts tell routers about group membership
Join GroupIGMPv2—Joining a Group
IGMPv2 has explicit Leave Group messages, which reduces overall leave latency.
IGMPv3 Report contains desired sources in the Include list. Only “Included” sources are joined.IGMPv3—Joining Specific Source(s)
Router sends periodic queries: Only “Included” sources are joined.
All IGMPv3 members respond.
Reports contain multiple group state records.IGMPv3—Maintaining State
Determining which IGMP version is running on an interface.
rtr-a>show ip igmp interface e0
Ethernet0 is up, line protocol is up
Internet address is 188.8.131.52, subnet mask is 255.255.255.0
IGMP is enabled on interface
Current IGMP version is 2
CGMP is disabled on interface
IGMP query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Inbound IGMP access group is not set
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 184.108.40.206 (this system)
IGMP querying router is 220.127.116.11 (this system)
Multicast groups joined: 18.104.22.168 22.214.171.124
Problem: Layer 2flooding of multicastframes
Solution 2:IGMP snooping