329
b.
Floods all other types of received IPv6 PIM messages except PIM hello messages in the
VLAN or VSI.
c.
Forwards all multicast data to all router ports in the VLAN or VSI.
Each IPv6 PIM-capable router in the VLAN, whether interested in the multicast data or not,
can receive all multicast data and all IPv6 PIM messages except IPv6 PIM hello messages.
•
When the Layer 2 switch runs both MLD snooping and IPv6 PIM snooping, it performs the
following actions:
d.
Examines whether an IPv6 PIM router is interested in the multicast data destined for a
multicast group according to the received IPv6 PIM messages that the router sends.
e.
Adds only the ports that connect to the router and are interested in the data to an IPv6 PIM
snooping routing entry.
f.
Forwards IPv6 PIM messages and the multicast data only to the router according to the
multicast forwarding entry, which saves network bandwidth.
For more information about MLD snooping and the router port, see "Configuring MLD snooping."
IPv6 PIM snooping can run in IPv6 PIM-SM and IPv6 PIM-SSM networks. Do not configure IPv6 PIM
snooping in IPv6 PIM-DM or IPv6 BIDIR-PIM networks. For more information about IPv6 PIM, see
"Configuring IPv6 PIM."
Configuring IPv6 PIM snooping
IMPORTANT:
•
Do not configure IPv6 PIM snooping in secondary VLANs because IPv6 PIM snooping does not take effect
on secondary VLANs. For more information about secondary VLANs, see
Layer 2—LAN Switching
Configuration Guide
.
•
Make sure the maximum size of an IPv6 PIM join or prune message is smaller than the path MTU of devices
connected to IPv6 PIM snooping devices. Otherwise, fragmented IPv6 PIM join or prune messages prevent
IPv6 PIM snooping from correctly forwarding multicast data. For more information about setting the
maximum size of an IPv6 PIM join or prune message, see "Configuring IPv6 PIM."
To configure IPv6 PIM snooping for a VLAN, enable MLD snooping globally on the Layer 2 device,
and enable MLD snooping and IPv6 PIM snooping for the VLAN.
After you enable IPv6 PIM snooping for a VLAN, IPv6 PIM snooping works only on the member
interfaces of the VLAN.
To configure IPv6 PIM snooping:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable MLD snooping
globally and enter MLD
-snooping view.
mld-snooping
By default, MLD snooping is
disabled.
3.
Return to system view.
quit
N/A
4.
Enter VLAN view or VSI
view.
•
Enter VLAN view:
vlan vlan-id
•
Enter VSI view:
vsi
vsi-name
N/A
5.
Enable MLD snooping for
the VLAN or VSI.
mld-snooping enable
By default, MLD snooping is
disabled in a VLAN.
6.
Enable IPv6 PIM snooping
for the VLAN or VSI.
ipv6 pim-snooping enable
By default, IPv6 PIM snooping is
disabled in a VLAN.