Figure 14-6 IGMP Out Of Group Protocol Process
According to the RFC2236 definition the host machine can send a message to IGMP router if it
leave the multicast (Ref Figure Host1 of 14-6), and the address is 224.0.0.2 (all IGMP router).
IGMP router in equery status after receive Out Message of member in its interface will in the last
Last Member Query Interval send Last Member Query Count and specific membership message
to the Out-Desire group. These specific group equerry has the max. response time (set into the
Last Member Query Interval). Router will suppose that there are not local members in this group
if no report messeages are received after the last query response time.
One host machine can be added with two different groups, such as Host2 and Host3 in above
Figure For they are members of 238.5.5.5, so they will send Report to response general query of
router in a certain period.
14.3 IGMP Configuration
●
User’s Command
：
enable igmpinterface
Input
：
user input interface IP address
Function
：
enable the support given by interface to IGMP, after which the switch will sent out
inquire packet to all host machines connected with this interface
Command’s Format
：
