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Configuring IPv6 PIM snooping
Overview
IPv6 Protocol Independent Multicast (PIM) snooping runs on Layer 2 devices. It determines which ports
are interested in multicast data by analyzing the received IPv6 PIM messages, and adds the ports to a
multicast forwarding entry to make sure that multicast data can be forwarded to only the ports that are
interested in the data.
Figure 75 Multicast packet transmission without or with IPv6 PIM snooping
As shown in Figure 75, 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.
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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