Operation Manual – Multicast ProtocolH3C S3610&S5510 Series Ethernet Switches Chapter 5 IGMP Configuration5-9To do... Use the command... DescriptionEnter system view system-view —Enter IGMP view igmp —Configure the router todiscard any IGMPmessage that does notcarry the Router-Alertoptionrequire-router-alertOptionalBy default, the devicedoes not check theRouter-AlertEnable the insertion of theRouter-Alert option intoIGMP messagessend-router-alertOptionalBy default, IGMPmessages carry theRouter-Alert optionII. Configuring IGMP packet options for an interfaceFollow these steps to configure IGMP packet options for an interface:To do... Use the command... DescriptionEnter system view system-view —Enter interface view interface interface-typeinterface-number —Configure the interface todiscard any IGMPmessage that does notcarry the Router-Alertoptionigmprequire-router-alertOptionalBy default, the devicedoes not check theRouter-AlertEnable the insertion of theRouter-Alert option intoIGMP messagesigmp send-router-alertOptionalBy default, IGMPmessages carry theRouter-Alert option5.4.3 Configuring IGMP TimersThe IGMP querier periodically sends IGMP general queries to decide whether anymulticast group member exists on the network. You can tune the IGMP general queryinterval based on actual condition of the network.Upon receiving an IGMP query (general query or group-specific query), a host starts adelay timer for each multicast group it has joined. This timer is initialized to a randomvalue in the range of 0 to the maximum response time, which is derived from the MaxResponse Time field in the IGMP query. When the timer value comes down to 0, thehost sends an IGMP report to the corresponding multicast group.
