Netgear XCM8806 Chassis User Manual - Page 737
Limitations, Configuring IGMP-SSM Mapping, Displaying IGMP-SSM Mappings
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NETGEAR 8800 User Manual When the router receives an IGMP Group leave message from a host, it sends out a group specific query (unless IGMP fast leave is configured) and continues to support joins for the corresponding (S1, G) to (Sn, G) channels. When the router does not get a response to the group specific query after a time-out period, IGMP-SSM mapping informs PIM that the list of (S1, G) to (Sn, G) pairs should be considered for PIM prunes. In a multi-access network (where more than one router is receiving IGMP messages from the hosts), only the designated router sends joins towards the source, so it is desirable to have same configuration for SSM group range and SSM Mapping range on all routers in a VLAN. Note: When a group source exists on the same VLAN as a receiver, IGMP snooping causes the traffic to be L2 switched to the receiver, even if another source is available through IGMP SSM. This happens because the group mappings are stored in PIM, which is a L3 protocol. The following sections provide additional information on IGMP-SSM mapping: • Limitations on page 737 • Configuring IGMP-SSM Mapping on page 737 • Displaying IGMP-SSM Mappings on page 738 Limitations • IGMP SSM mapping support is provided for IPv4 only. • PIM must be disabled on a switch to configure IGMP-SSM mapping. • A single group address or range can be mapped to a maximum of 50 sources. If more than 50 sources are configured, the switch uses the 50 longest-matching prefixes. • NETGEAR recommends a maximum of 500 mappings per switch, but no limit is imposed by the software. Configuring IGMP-SSM Mapping To support PIM-SSM for IGMPv1 and IGMPv2 clients, a PIM-SSM range must be configured, and that range should include all groups to which the clients want access. If IGMPv1 and IGMPv2 clients request group addresses outside the PIM-SSM range, those addresses are ignored by PIM-SSM and forwarded to PIM as (*, G) requests. To enable IGMP-SSM mapping, first configure a PIM-SSM range, and then enable IGMP-SSM mapping using the following commands: configure pim ssm range [default | policy ] enable igmp ssm-map {vr } To configure an IGMP-SSM mapping, use the following command: Chapter 27. Multicast Routing and Switching | 737
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