3Com Switch 8800 Advanced Software V5 Configuration Guide

530 CHAPTER 40: IGMP CONFIGURATION
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When you use an advanced ACL as a filter, the source address in the ACL rule is
the address of the multicast source specified in the IGMPv3 reports, rather than
the source address in the IP packets.
Configuring IGMP
Performance
Parameters
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For the configuration tasks described in this section:
■ Configurations performed in IGMP view are effective on all interfaces, while
configurations performed in interface view are effective on the current
interface only.
■ If the same feature is configured in both IGMP view and interface view, the
configuration performed in interface view is given priority, regardless of the
configuration sequence.
Configuration
Prerequisites
Before configuring IGMP performance parameters, complete the following tasks:
■ Configure any unicast routing protocol so that all devices in the domain are
interoperable at the network layer.
■ Configure basic functions of IGMP
Before configuring IGMP performance parameters, prepare the following data:
■ IGMP general query interval
■ Maximum response time for IGMP general queries
■ Other querier present interval
■ IGMP last-member query interval and count
Configuring IGMP
Message Options
As IGMPv2 and IGMPv3 involve group-specific and group-and-source-specific
queries, and multicast groups change dynamically, a device cannot join all
multicast groups. Therefore, when receiving a multicast packet but unable to
locate the outgoing interface for the destination multicast group, an IGMP router
needs to leverage the Router-Alert option to pass the multicast packet to the
upper-layer protocol for processing. Depending on whether an IGMP message
carries the Router-Alert option in the IP header, the device processes the message
differently. For details about Router-Alert, refer to RFC 2113.
By default, for the consideration of compatibility, the device does not check the
Router-Alert option, namely it processes all the IGMP messages it received. In this
To do... Use the command... Description
Enter system view system-view -
Enter POS interface view interface interface-type
interface-number
-
Configuring a Multicast
Group Filter
igmp group-policy
acl-number [ version-number ]
Required
No multicast group filter
configured by default