Multicasting
membership information enables the router to forward traffic only from those sources from which receivers requested the traffic.
IGMPv3 supports applications that explicitly signal sources from which they want to receive traffic. With IGMPv3, receivers signal membership to a multicast host group in the following two modes:
•INCLUDE mode: In this mode, the receiver announces membership to a host group and provides a list of IP addresses (the INCLUDE list) from which it wants to receive traffic.
•EXCLUDE mode: In this mode, the receiver announces membership to a host group and provides a list of IP addresses (the EXCLUDE list) from which it does not want to receive traffic. This indicates that the host wants to receive traffic only from other sources whose IP addresses are not listed in the EXCLUDE list. To receive traffic from all sources, like in the case of the Internet Standard Multicast (ISM) service model, a host expresses EXCLUDE mode membership with an empty EXCLUDE list.
IGMPv3 is used by the hosts to express their desire to be a part of the
IGMP Commands
The IGMP commands supported are:
| TABLE 6 IGMP COMMANDS |
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| Enabling igmp | Foundry/configure > ip igmp |
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| Disabling igmp | Foundry/configure > no ip igmp |
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| Enabling igmp | Foundry/configure/ip/igmp# interface |
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| Disabling igmp | Foundry/configure/ip/igmp# no interface |
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| Configuring version | Foundry/configure/ip/igmp/interface ethernet0# version |
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| <version# |
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| Configuring Query | Foundry/configure/ip/igmp/interface ethernet0# query- |
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| Interval | interval <interval# |
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| Configuring Maximum | Foundry/configure/ip/igmp/interface ethernet0# query- |
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| Response Time |
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| Configuring Last | Foundry/configure/ip/igmp/interface ethernet0# last- |
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| Member Query Interval |
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| Configuring Last | Foundry/configure/ip/igmp/interface ethernet0# last- |
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| Member Query Count |
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| Configuring Startup | Foundry/configure/ip/igmp/interface ethernet0# startup- |
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| Query Interval | <interval# |
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| Configuring Startup | Foundry/configure/ip/igmp/interface ethernet0# startup- |
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| Query Count | <count# |
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| Configuring Robustness | Foundry/configure/ip/igmp/interface ethernet0# robustness |
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| <value# |
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| Configuring | Foundry/configure/ip/igmp/interface ethernet0# [no] ignore- |
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| message |
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| Configuring | Foundry/configure/ip/igmp/interface ethernet0# [no] ignore- |
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| message |
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June 2004 | © 2004 Foundry Networks, Inc. | 14 - 5 |
