H3C Technologies H3C S12500 Series Switches - Manual (Page 311)

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Disabling a port from becoming a dynamic router port
The following problems exist in a multicast access network:
• After receiving an MLD general query or IPv6 PIM hello message from a connected host, a router
port becomes a dynamic router port. Before its timer expires, this dynamic router port will receive all
multicast packets within the VLAN to which it belongs and forward then to the host, thus affecting
normal multicast reception of the host.
• In addition, the MLD general query and IPv6 PIM hello message sent from the host affects the
multicast routing protocol state on Layer 3 devices, such as the MLD querier or DR election, and
might further cause network interruption.
To solve these problems, you can disable the router port from becoming a dynamic router port after
receiving an MLD general query or IPv6 PIM hello message, so as to enhance network security and the
control over multicast users.
To disable a port from becoming a dynamic router port:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view,
or enter port group view.
• Enter Layer 2 Ethernet interface view or
Layer 2 aggregate interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual port-group-name
Use either method.
3. Disable the port from
becoming a dynamic router
port.
mld-snooping router-port-deny [ vlan
vlan-list ]
By default, a port can
become a dynamic router
port.
NOTE:
This configuration does not affect the static router port configuration.
Configuring MLD snooping querier
Before you configure MLD snooping querier, complete the following tasks:
• Enable MLD snooping in the VLAN.
• Determine the MLD general query interval.
• Determine the MLD last-listener query interval.
• Determine the maximum response delay for MLD general queries.
• Determine the source IPv6 address of MLD general queries.
• Determine the source IPv6 address of MLD multicast-address-specific queries.
Enabling MLD snooping querier
In an IPv6 multicast network that run MLD, a multicast router or Layer 3 multicast switch is responsible for
sending MLD general queries periodically, so that all Layer 3 multicast devices can establish and