H3C S9500 Series Operation Manual

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H3C S9500 Series Operation Manual Manual pdf 8 page image

Operation Manual – IGMP SnoopingH3C S9500 Series Routing Switches Chapter 1 IGMP Snooping Configuration1-6z If any IGMP report in response to the group-specific query is received on the port(suppose it is a dynamic member port) before its aging timer expires, this meansthat some host attached to the port is receiving or expecting to receive multicastdata for that multicast group. The switch resets the aging timer of the port.z If no IGMP report in response to the group-specific query is received on the portbefore its aging timer expires, this means that no hosts attached to the port are stilllistening to that group address: the switch removes the port from the outgoing portlist of the forwarding table entry for that multicast group when the aging timerexpires.1.1.4 Processing of Multicast Protocol MessagesWith Layer 3 multicast routing enabled, an IGMP Snooping–capable S9500 seriesEthernet switch processes multicast protocol messages differently under differentconditions, specifically as follows:1) If only IGMP is enabled, or both IGMP and PIM are enabled on the switch, theswitch handles multicast protocol messages in the normal way.2) In only PIM is enabled on the switch:z The switch broadcasts IGMP messages as unknown messages in the VLAN.z Upon receiving a PIM hello message, the switch will maintain the correspondingrouter port.3) When IGMP is disabled on the switch:z If PIM is disabled, the switch deletes all its dynamic member ports and dynamicrouter ports.z If PIM is enabled, the switch deletes only its dynamic member ports withoutdeleting its dynamic router ports.4) When PIM is disabled on the switch:z If IGMP is disabled, the switch deletes only its dynamic router ports withoutdeleting its dynamic member ports.z If IGMP is enabled, the switch maintains all its dynamic member ports anddynamic router ports.Note:On a switch with Layer-3 multicast routing enabled, use the display igmp groupport-info command to view Layer-2 port information. For details about this command,refer to IGMP Commands in the IP Multicast Volume.