HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 29
Configuring basic IGMP snooping functions, Enabling IGMP snooping
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effective only on the current port. For a given port, a configuration that you make in IGMP snooping view is effective only if you do not make the same configuration in Layer 2 Ethernet interface view or Layer 2 aggregate interface view. • For IGMP snooping, the configurations that you make on a Layer 2 aggregate interface do not interfere with those you make on its member ports, nor do they participate in aggregation calculations. Configurations that you make on a member port of an aggregate group do not take effect until it leaves the aggregate group. Configuring basic IGMP snooping functions Before you configure basic IGMP snooping functions, complete the following tasks: • Configure the corresponding VLANs. • Determine the version of IGMP snooping. Enabling IGMP snooping When you enable IGMP snooping, follow these guidelines: • You must enable IGMP snooping globally before you enable it in a VLAN. • After you enable IGMP snooping in a VLAN, do not enable IGMP or PIM on the corresponding VLAN interface. • When you enable IGMP snooping in a specified VLAN, IGMP snooping works only on the ports in this VLAN. To enable IGMP snooping: Step 1. Enter system view. 2. Enable IGMP snooping globally and enter IGMP-snooping view. 3. Return to system view. 4. Enter VLAN view. 5. Enable IGMP snooping in the VLAN. Command system-view igmp-snooping quit vlan vlan-id igmp-snooping enable Remarks N/A Disabled by default N/A N/A Disabled by default Specifying the version of IGMP snooping Different versions of IGMP snooping can process different versions of IGMP messages: • IGMPv2 snooping can process IGMPv1 and IGMPv2 messages, but cannot process IGMPv3 messages, which will be flooded in the VLAN. • IGMPv3 snooping can process IGMPv1, IGMPv2 and IGMPv3 messages. If you change IGMPv3 snooping to IGMPv2 snooping, the system: • Clears all IGMP snooping forwarding entries that are dynamically added. • Keeps static IGMPv3 snooping forwarding entries (*, G). • Clears static IGMPv3 snooping forwarding entries (S, G), which will be restored when IGMP snooping is switched back to IGMPv3 snooping. 18
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