Disabling A Port From Becoming A Dynamic Router Port - HP A5500 SI Switch Series Configuration Manual

switch immediately removes that port from the outgoing port list of the forwarding table entry for the
indicated IPv6 multicast group. Then, when the switch receives MLD multicast-address-specific queries for
that IPv6 multicast group, it does not forward them to that port.
In VLANs where only one host is attached to each port, fast-leave processing helps improve bandwidth
and resource usage. However, if fast-leave processing is enabled on a port that connects to more than
one host, when one host leaves a multicast group, the other hosts attached to the port and interested in
the same multicast group will fail to receive multicast data for that group. Therefore, if the function of
dropping unknown IPv6 multicast traffic is already enabled on the switch or in the VLANs, you should
not enable the fast-leave processing function.
Configuring fast-leave processing globally
Follow these steps to configure fast-leave processing globally:
To do...
Enter system view
Enter MLD snooping view
Enable fast-leave processing
Configuring fast-leave processing on a port or a group of ports
Follow these steps to configure fast-leave processing on a port or a group of ports:
To do...
Enter system view
Enter Ethernet interface view,
Layer 2 aggregate interface view,
or port group view
Enable fast-leave processing

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 receives all
multicast packets within the VLAN where the port belongs, and forwards them to the host, affecting
normal multicast reception of the host.
In addition, the MLD general query and IPv6 PIM hello message that the host sends 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, disable that router port from becoming a dynamic router port after the port
receives an MLD general query or IPv6 PIM hello message, so as to improve network security and
control over multicast users.
Follow these steps to disable a port from becoming a dynamic router port:
Use the command...
system-view
mld-snooping
fast-leave [ vlan vlan-list ]
Use the command...
system-view
interface interface-type interface-
number
port-group manual port-group-
name
mld-snooping fast-leave [ vlan
vlan-list ]
251
Remarks
—
—
Required
Disabled by default
Remarks
—
Required
Use either approach
Required
Disabled by default