HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 35
Configuring parameters for IGMP queries and responses
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Step 2. Enter VLAN view. 3. Enable IGMP snooping querier. Command vlan vlan-id igmp-snooping querier Remarks N/A Disabled by default IMPORTANT: In a multicast network that runs IGMP, you do not need to configure an IGMP snooping querier because it may affect IGMP querier elections by sending IGMP general queries with a low source IP address. Configuring parameters for IGMP queries and responses CAUTION: In the configuration, make sure that the IGMP general query interval is larger than the maximum response delay for IGMP general queries. Otherwise, multicast group members might be deleted by mistake. You can modify the IGMP general query interval based on actual condition of the network. A multicast listening host starts a timer for each multicast group that it has joined when it receives an IGMP query (general query or group-specific query). This timer is initialized to a random value in the range of 0 to the maximum response delay advertised in the IGMP query message. When the timer value decreases to 0, the host sends an IGMP report to the multicast group. To speed up the response of hosts to IGMP queries and avoid simultaneous timer expirations causing IGMP report traffic bursts, you must properly set the maximum response delay. • The maximum response delay for IGMP general queries is set by the max-response-time command. • The maximum response delay for IGMP group-specific queries equals the IGMP last-member query interval. Configuring the global parameters for IGMP queries and responses Step 1. Enter system view. 2. Enter IGMP-snooping view. 3. Set the maximum response delay for IGMP general queries. 4. Set the IGMP last-member query interval. Command system-view igmp-snooping max-response-time interval last-member-query-interval interval Configuring the parameters for IGMP queries and responses in a VLAN Remarks N/A N/A 10 seconds by default 1 second by default Step 1. Enter system view. 2. Enter VLAN view. 3. Set the interval for sending IGMP general queries. Command system-view vlan vlan-id igmp-snooping query-interval interval 24 Remarks N/A N/A 60 seconds by default
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