Igmp Snooping Troubleshooting; Igmp Proxy Configuration; Introduction To Igmp Proxy - Planet XGS3-42000R User Manual

Scenario 3: To run in cooperation with lay er 3 multicast prot ocols.
SWITCH which is used in Scenario 1 is replaced with ROUTE R with specific configurations remains the same.
And multicast and IGMP snooping configurations are the same with what it is in Scenario 1. To configure
PIM-SM on ROUTE R, and enable PIM-SM on vlan 100 (use the same PIM mode with the connected multicast
router)
Configurations are listed as below:
XGS 3-42000R#config
XGS 3-42000R(config)#ip pim multicast-routing
XGS 3-42000R(config)#interface vlan 100
XGS 3-42000R(config-if-vlan100)#ip pim sparse-mode
IGMP snooping does not distribute entries when layer 3 multicast protocol is enabled. It only does the
following tasks.

Remove the layer 2 multicast entries.

Provide query functions to the layer 3 with vlan, S, and G as the parameters.

When layer 3 IGMP is disabled, re-enable distributing layer 2 multicast entries.
By looking up the lay er 3 IPMC entries, it can be found that ports can be indicated by the layer 3 multicast
entries. This ensures the IGMP snooping can work in cooperation with the layer 3 multicast protocols.

43.10.4 IGMP Snooping Troubleshooting

On IGMP Snooping function configuration and usage, IGMP Snooping might not run properly bec ause of
physical connection or configuration mistakes. So the users should note that:

Make sure correct physical connection

Activate IGMP Snooping on whole configuration mode (use ip igmp snooping)

Configure IGMP Snooping at VLAN on whole configuration mode ( use ip igmp snooping vlan
<vlan-id>)

Make sure one VLA N is configured as L2 common checker in same mask, or make sure configured
static mrouter

Use show ip igmp snooping vlan <vid> command check IGMP Snooping information

43.11 IGMP Proxy Configuration

43.11.1 Introduction to IGMP Proxy

IGMP/MLD proxy which is introduced in rfc4605, is a simplified multicast protocol running at edge boxes. The
edge boxes which runs the IGMP/MLD proxy protocol, does not need to run complicated multicast routing
protocols such as PIM/DVMRP. However they work with multicast protocol enabled net work through
IGMP/MLD proxy. They can simplify the implementation of multicasting on edge devices.
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