Configuring Ipv6 Pim Snooping; Overview - HP FlexFabric 5950 series Configuration Manual

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 95 Multicast packet transmission without or with IPv6 PIM snooping
IPv6 multicast packet transmission
when only MLD snooping runs
Source 1
IPv6 PIM
router 1
IPv6 PIM
router 3
Receiver 1
As shown in
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 or
VSI.
•
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.
Source 2
Layer 2 switch
Receiver 2
IPv6 multicast packets (S1, G1)
IPv6 multicast packets (S2, G2)
Figure 95, Source 1 sends multicast data to multicast group G1, and Source 2 sends
MLD snooping and IPv6 PIM snooping both run
IPv6 PIM IPv6 PIM
router 2 router 1
IPv6 PIM IPv6 PIM
router 4 router 3
Receiver 1
328
IPv6 multicast packet transmission when
Source 1
Join message (S1, G1)
Join message (S2, G2)
Source 2
IPv6 PIM
router 2
Layer 2 switch
IPv6 PIM
router 4
Receiver 2