reverse path back to the source of the traffic as determined by the unicast routing tables (routing FIB.) Only
one multicast stream is sent to the joining host. This configuration provides a redundant in case the first fails.
Operating notes for IGMP proxy forwarding
• You can configure up to 12 multicast domains, which indicate a range of multicast addresses and the IP
address of the PIM-SM/PIM-DM border router.
• You must give each domain a unique name, up to 20 characters.
• The domains may have overlapping multicast ranges.
• The IP address of the border router may be the same or different in each configured domain.
• Duplicate IGMP joins are automatically prevented, or leaves that would remove a flow currently joined by
multiple hosts.
• Range overlap allows for redundant connectivity and the ability for multicasts to arrive from different border
routers based on the shortest path back to the source of the traffic.
• The configured domain names must be associated with one or more VLANs for which the proxy joins are to be
done.
• All routers in the path between the edge router receiving the initial IGMP packets and the border router have to
be configured to forward IGMP using IGMP proxy.
• All upstream and downstream interfaces using IGMP proxy forwarding require IGMP and PIM to be enabled.
• You must remove all VLAN associations with the domain name before that domain name can be removed.
• The appropriate border routers must be used for each VLAN, or PIM-DM will not forward the traffic. This could
occur when multiple border routers exist. It may be necessary to configure multiple overlapping domains if the
multicast source address can generate the same multicast address and have different best paths to the PIM-
DM domain.
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Aruba 3810 / 5400R Multicast and Routing Guide for ArubaOS-
Switch 16.08
