Dell PowerSwitch S5212F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 621
Important notes, Supported IGMP versions, Query interval, Last member query interval, Maximum
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• OS10 uses version 3 as the default IGMP version. Version 3 is backwards compatible with versions 1 and 2. Important notes • OS10 systems cannot serve as an IGMP host or an IGMP version 1 querier. • OS10 automatically enables IGMP on interfaces where you enable PIM sparse mode. Supported IGMP versions IGMP has three versions. Version 3 obsoletes and is backwards-compatible with version 2; version 2 obsoletes version 1. OS10 supports the following IGMP versions: • Router-IGMP versions 2 and 3. The default is version 3. • Host-IGMP versions 1, 2, and 3. In IGMP version 2, the host expresses interest in a particular group membership (*, G). In IGMP version 3, the host expresses interest in a particular group membership, and specifies the source from which it wants the multicast traffic (S, G). Query interval The IGMP querier periodically sends a general query to discover which multicast groups are active. A group must have at least one host to be active. By default, the periodic query messages are sent every 60 seconds. You can configure this value using the ip igmp queryinterval command. To configure a query interval: OS10# configure terminal OS10# interface vlan120 OS10(conf-if-vl-120)# ip igmp query-interval 60 Last member query interval When the IGMP querier receives a leave message, it sends a group-specific query message to ensure if any other host in the network is interested in the multicast flow. By default, the group-specific query messages are sent every 1000 milliseconds. You can configure this value using the ip igmp last-member-query-interval command. To configure last member query interval: OS10# configure terminal OS10# interface vlan120 OS10(conf-if-vl-120)# ip igmp last-member-query-interval 200 Maximum response time The maximum response time is the amount of time that the querier waits for a response to a query before taking action. When a host receives a query, it does not respond immediately, but rather starts a delay timer. The delay time is set to a random value between 0 and the maximum response time. The host sends a response when the timer expires; in IGMP version 2, if another host responds before the timer expires, the timer nullifies, and no response is sent. Multicast 621
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1,182
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1,183
-
1,184
-
1,185
-
1,186
-
1,187
-
1,188
-
1,189
-
1,190
-
1,191
-
1,192
-
1,193
-
1,194
-
1,195
-
1,196
-
1,197
-
1,198
-
1,199
-
1,200
-
1,201
-
1,202
-
1,203
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![](/manual_guide/products/dell-powerswitch-s3048on-os10-enterprise-edition-user-guide-release-10430-cc9d5f5/621.png)