Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 394
Adjusting the IGMP Querier Timeout Value, Configuring a Static IGMP Group
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INTERFACE mode ip igmp query-interval • Adjust the maximum response time. INTERFACE mode ip igmp query-max-resp-time • Adjust the last member query interval. INTERFACE mode ip igmp last-member-query-interval Adjusting the IGMP Querier Timeout Value If there is more than one multicast router on a subnet, only one is elected to be the querier, which is the router that sends queries to the subnet. 1. Routers send queries to the all multicast systems address, 224.0.0.1. Initially, all routers send queries. 2. When a router receives a query, it compares the IP address of the interface on which it was received with the source IP address given in the query. If the receiving router IP address is greater than the source address given in the query, the router stops sending queries. By this method, the router with the lowest IP address on the subnet is elected querier and continues to send queries. 3. If a specified amount of time elapses during which other routers on the subnet do not receive a query, those routers assume that the querier is down and a new querier is elected. The amount of time that elapses before routers on a subnet assume that the querier is down is the other querier present interval. • Adjust the other querier present interval. INTERFACE mode ip igmp querier-timeout Configuring a Static IGMP Group To configure and view a static IGMP group, use the following commands. Multicast traffic for static groups is always forwarded to the subnet even if there are no members in the group. Static groups have an expiration value of Never and a Last Reporter value of CLI, as shown in the example in Viewing IGMP Groups. • Configure a static IGMP group. INTERFACE mode ip igmp static-group • View the static groups. EXEC Privilege mode. show ip igmp groups 394 Internet Group Management Protocol (IGMP)
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