3Com Switch 4800G 24-Port - Configuring an MLD Snooping Policy

Configuring an MLD Snooping Policy 591
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CAUTION: Make sure that the MLD query interval is greater than the maximum
response time for MLD general queries; otherwise undesired deletion of IPv6
multicast members may occur.
Configuring Source IPv6
Addresses of MLD
Queries
This configuration allows you to change the source IPv6 address of MLD queries.
Follow these steps to configure source IPv6 addresses of MLD queries:
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CAUTION: The source IPv6 address of MLD query messages may affect MLD
querier election within the segment.
Configuring an MLD
Snooping Policy
Configuration
Prerequisites
Before configuring an MLD Snooping policy, complete the following tasks:
■ Enable MLD Snooping in the VLAN
Before configuring an MLD Snooping policy, prepare the following data:
■ IPv6 ACL rule for IPv6 multicast group filtering
■ The maximum number of IPv6 multicast groups that can pass the ports
Configuring an IPv6
Multicast Group Filter
On a MLD Snooping-enabled switch, the configuration of an IPv6 multicast group
filter allows the service provider to define limits of multicast programs available to
different users.
In an actual application, when a user requests a multicast program, the user’s host
initiates an MLD report. Upon receiving this report message, the switch checks the
report against the configured ACL rule. If the port on which the report was heard
can join this IPv6 multicast group, the switch adds an entry for this port in the MLD
Snooping forwarding table; otherwise the switch drops this report message. Any
IPv6 multicast data that fails the ACL check will not be sent to this port. In this
way, the service provider can control the VOD programs provided for multicast
users.
Configuring an IPv6 multicast group filter globally
Follow these steps to configure an IPv6 multicast group globally:
To do… Use the command… Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure the source IPv6
address of MLD general
queries
mld-snooping
general-query source-ip
{ current-interface |
ipv6-address }
Optional
FE80::02FF:FFFF:FE00:0001 by
default
Configure the source IPv6
address of MLD
multicast-address-specific
queries
mld-snooping
special-query source-ip
{ current-interface |
ipv6-address }
Optional
FE80::02FF:FFFF:FE00:0001 by
default