HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 24
Aging timers for dynamic ports in IGMP snooping and related messages and actions
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Figure 11 IGMP snooping related ports The following describes the ports involved in IGMP snooping: • Router port-Layer 3 multicast device-side port. Layer 3 multicast devices include designated routers (DRs) and IGMP queriers. In Figure 11, GigabitEthernet 1/0/1 of Switch A and GigabitEthernet 1/0/1 of Switch B are router ports. The switch registers all its router ports in its router port list. Do not confuse the "router port" in IGMP snooping with the "routed interface" commonly known as the "Layer 3 interface." The router port in IGMP snooping is the Layer 2 interface. • Member port-Multicast receiver-side port. In Figure 11, GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3 of Switch A and GigabitEthernet 1/0/2 of Switch B are member ports. The switch registers all its member ports in its IGMP snooping forwarding table. Unless otherwise specified, router ports and member ports in this document include both static and dynamic router ports and member ports. NOTE: An IGMP-snooping-enabled switch deems that all its ports on which IGMP general queries with the source IP address other than 0.0.0.0 or that receive PIM hello messages are received are dynamic router ports. For more information about PIM hello messages, see "Configuring PIM." Aging timers for dynamic ports in IGMP snooping and related messages and actions Timer Dynamic router port aging timer Description Message before expiry Action after expiry For each dynamic router port, the switch starts an aging timer. When the timer expires, the dynamic router port ages out. IGMP general query of which the source address is not 0.0.0.0 or PIM hello. The switch removes this port from its router port list. 13
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