3Com S7906E - Switch, Configuration Manual

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Configuring IPv6 Multicast Forwarding on a Downstream Interface
Typically, only queriers are able to forward IPv6 multicast traffic while non-queriers have no forwarding
capabilities, to avoid duplicate multicast flows. It is the same on MLD proxy devices. Only the
downstream interfaces acting as a querier can forward IPv6 multicast traffic to downstream hosts.
However, when a downstream interface of a proxy device fails to win the querier election, you need to
enable IPv6 multicast forwarding on this interface.
Follow these steps to enable IPv6 multicast forwarding on a downstream interface
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable IPv6 multicast forwarding
on a non-querier downstream
interface
mld proxying forwarding
Required
Disabled by default
On a multi-access network with more than one MLD proxy devices, you cannot enable IPv6 multicast
forwarding on any other non-querier downstream interface after one of the downstream interfaces of
these MLD proxy devices has been elected as the querier. Otherwise, duplicate multicast flows may be
received on the multi-access network.
Displaying and Maintaining MLD Configuration
To do… Use the command… Remarks
Display MLD multicast group
information display mld group [ ipv6-group-address | interface
interface-type interface-number ] [ static | verbose ]
Available
in any view
Display Layer 2 port
information about MLD
multicast groups (on a
distributed device)
display mld group port-info [ vlan vlan-id ] [ slot
slot-number ] [ verbose ]
Available
in any view
Display the Layer 2 port
information of MLD multicast
groups (on a distributed IRF
device)
display mld group port-info [ vlan vlan-id ]
[ chassis chassis-number slot slot-number ]
[ verbose ]
Available
in any view
Display MLD configuration
and running information on the
specified interface or all
MLD-enabled interfaces
display mld interface [
interface-type
interface-number ] [ verbose ]
Available
in any view
Display the information of the
MLD proxying groups display mld proxying group [ group-address ]
[ verbose ]
Available
in any view
Display the information of the
MLD routing table
display mld routing-table [ ipv6-source-address
[ prefix-length ] | ipv6-group-address [ prefix-length ] |
flags { act | suc } ] *
Available
in any view