H3C Technologies H3C S12500 Series Switches - Manual (Page 374)

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Configuration guidelines
• Each device can have only one interface serving as the MLD proxy interface.
• You cannot enable MLD on interfaces with MLD proxying enabled. Moreover, only the mld
require-router-alert, mld send-router-alert, and mld version commands can take effect on such
interfaces.
• You cannot enable other IPv6 multicast routing protocols (such as IPv6 PIM-DM or IPv6 PIM-SM) on
interfaces with MLD proxying enabled, or vice versa. However, the source-lifetime, source-policy,
and ssm-policy commands configured in IPv6 PIM view can still take effect.
• You cannot enable MLD proxying on a VLAN interface with MLD snooping enabled, or vice versa.
Enabling MLD proxying
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable the MLD proxying
feature.
mld proxying enable Disabled by default.
Configuring IPv6 multicast forwarding on a downstream
interface
IMPORTANT:
On a multi-access network with more than one MLD proxy device, do not 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 might be received on
the multi-access network.
To avoid duplicate multicast flows, only queriers can forward IPv6 multicast traffic and non-queriers have
no forwarding capabilities. 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.
To enable IPv6 multicast forwarding on a downstream interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable IPv6 multicast forwarding
on a non-querier downstream
interface.
mld proxying forwarding Disabled by default.