Multimedia Traffic Control with IP Multicast (IGMP)
How IGMP Operates
ProCurve(config)# show igmp-proxy vlans
IGMP PROXY VLANs
VID
Multicast Domain Active entries
------ ---------------- --------------
1
George
1
1
Sam
1
1
Jane
0
2
George
1
4
George
0
4
Bill
0
Figure 2-9. Example Showing Active IGMP Proxy VLANs
Operating Notes for IGMP Proxy Forwarding
■
You can configure up to 12 multicast domains. These domains will 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 long.
■
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 mul
ticasts 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.
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