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Configuring IPv6 PIM snooping
Overview
IPv6 PIM snooping runs on Layer 2 devices. It works with MLD snooping to analyze received IPv6
PIM messages, and adds the ports that are interested in specific multicast data to an IPv6 PIM
snooping routing entry. In this way, the multicast data can be forwarded to only the ports that are
interested in the data.
Figure 27 Multicast packet transmission without or with IPv6 PIM snooping
As shown in Figure 27, Source 1 sends multicast data to multicast group G1, and Source 2 sends
multicast data to multicast group G2. Receiver 1 belongs to G1, and Receiver 2 belongs to G2. The
Layer 2 switch's interfaces that connect to the IPv6 PIM-capable routers are in the same VLAN.
• When the Layer 2 switch only runs MLD snooping, it performs the following actions:
a. Maintains the router ports according to the received IPv6 PIM hello messages that IPv6
PIM-capable routers send.
IPv6 multicast packet transmission
when only MLD snooping runs
IPv6 multicast packet transmission when
MLD snooping and IPv6 PIM snooping both run
Source 1
Source 2
Receiver 1 Receiver 2
IPv6 multicast packets (S1, G1) Join message (S1, G1)
Layer 2 switch
Source 1 Source 2
Receiver 1 Receiver 2
Layer 2 switch
IPv6 multicast packets (S2, G2) Join message (S2, G2)
IPv6 PIM
router 3
IPv6 PIM
router 1
IPv6 PIM
router 2
IPv6 PIM
router 4
IPv6 PIM
router 3
IPv6 PIM
router 1
IPv6 PIM
router 2
IPv6 PIM
router 4
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