HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 102
Enabling IGMP proxying, Configuration guidelines, Configuration procedure, Configuring multicast
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• Configure any unicast routing protocol so that all devices in the domain are interoperable at the network layer. • Enable IP multicast routing. Enabling IGMP proxying You can enable IGMP proxying on the interface in the direction toward the root of the multicast forwarding tree to make the switch serve as an IGMP proxy. Configuration guidelines • Each switch can have only one interface serving as the proxy interface.. • You cannot enable IGMP on an interface with IGMP proxying enabled. Moreover, only the igmp require-router-alert, igmp send-router-alert, and igmp version commands can take effect on such an interface. • You cannot enable other multicast routing protocols (such as PIM-DM or PIM-SM) on an interface with IGMP proxying enabled, or vice versa. However, the source-lifetime, source-policy, and ssm-policy commands configured in PIM view can still take effect. In addition, in IGMPv1, the designated router (DR) is elected by the working multicast routing protocol (such as PIM) to serve as the IGMP querier. Therefore, a downstream interface running IGMPv1 cannot be elected as the DR and thus cannot serve as the IGMP querier. • You cannot enable IGMP proxying on a VLAN interface with IGMP snooping enabled, or vice versa. Configuration procedure To enable IGMP proxying: Step 1. Enter system view. 2. Enter interface view. 3. Enable the IGMP proxying feature. Command Remarks system-view N/A interface interface-type interface-number N/A igmp proxying enable Disabled by default Configuring multicast forwarding on a downstream interface Only queriers can forward multicast traffic but non-queriers have no multicast forwarding capabilities. This design helps avoid duplicate multicast flows. It is the same on IGMP proxy switches. Only the downstream interfaces acting as a querier can forward multicast traffic to downstream hosts. However, when a downstream interface of a proxy switch fails to win the querier election, you must enable multicast forwarding on this interface. On a multi-access network with more than one IGMP proxy switch, you cannot enable multicast forwarding on any other non-querier downstream interface after one of the downstream interfaces of these IGMP proxy switches has been elected as the querier. Otherwise, duplicate multicast flows might be received on the multi-access network. To enable multicast forwarding on a downstream interface: 91
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