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c. Forwards all multicast data to all router ports in the VLAN.
Each PIM router in the VLAN, whether interested in the multicast data or not, can receive all
multicast data and all PIM messages except PIM hello messages.
• When the Layer 2 switch runs both IGMP snooping and PIM snooping, it performs the following
actions:
a. Examines whether a PIM router is interested in the multicast data addressed to a multicast
group according to the received PIM messages that the router send.
b. Adds only the ports that connect to the router and are interested in the data to a PIM snooping
routing entry.
c. Forwards PIM messages and multicast data to only the routers that are interested in the data,
which saves network bandwidth.
For more information about IGMP snooping and the router port, see "Configuring IGMP snoop
ing."
PIM snooping can run in PIM-SM and PIM-SSM networks. Do not configure PIM snooping in PIM-DM or
BIDIR-PIM networks. For more information about PIM, see "Configuring PIM."
Configuring PIM snooping
To configure PIM snooping for a VLAN, you must enable IGMP snooping globally on the Layer 2 device,
and then enable IGMP snooping and PIM snooping for the VLAN.
After you enable PIM snooping for a VLAN, PIM snooping works only on the member interfaces of the
VLAN.
To configure PIM snooping:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enable IGMP snooping
globally and enter
IGMP-snooping view.
igmp-snooping
By default, IGMP snooping is
disabled.
3. Return to system view.
quit N/A
4. Enter VLAN view.
vlan vlan-id N/A
5. Enable IGMP snooping for
the VLAN.
igmp-snooping enable
By default, IGMP snooping is
disabled in a VLAN.
6. Enable PIM snooping for the
VLAN.
pim-snooping enable
By default, PIM snooping is disabled
in a VLAN.
7. (Optional.) Set the aging
time for the PIM snooping
global neighbor ports on the
new master device in IRF
master election.
pim-snooping graceful-restart
neighbor-aging-time interval
The default setting is 105 seconds.
A global neighbor port is a Layer 2
aggregate interface that acts as a
neighbor port.
8. (Optional.) Set the aging
time for the PIM snooping
global downstream ports
and global router ports on
the new master device in IRF
master election.
pim-snooping graceful-restart
join-aging-time interval
The default setting is 210.
A global downstream port or a global
router port is a Layer 2 aggregate
interface that acts as a downstream
port or router port.
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