Igmp proxy – H3C Technologies H3C S3600 Series Switches User Manual
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3-5
z
TO_IN: The filtering mode has changed from Exclude to Include.
z
TO_EX: The filtering mode has changed from Include to Exclude.
z
ALLOW: The Source Address fields in this Group Record contain a list of the additional sources
that the system wishes to hear from, for packets sent to the specified multicast address. If the
change was to an Include source list, these are the addresses that were added to the list; if the
change was to an Exclude source list, these are the addresses that were deleted from the list.
z
BLOCK: indicates that the Source Address fields in this Group Record contain a list of the sources
that the system no longer wishes to hear from, for packets sent to the specified multicast address.
If the change was to an Include source list, these are the addresses that were deleted from the list;
if the change was to an Exclude source list, these are the addresses that were added to the list.
Currently, only the IGMPv1 and IGMPv2 are supported on S3600 series Ethernet switches.
IGMP Proxy
A lot of stub networks (stub domains) are involved in the application of a multicast routing protocol
(PIM-DM for example) over a large-scaled network. It is a hard work to configure and manage these
stub networks.
To reduce the workload of configuration and management without affecting the multicast connection of
leaf networks, you can configure an IGMP Proxy on a Layer 3 switch in the stub network (Switch B
). The Layer 3 switch will then forward IGMP join or IGMP leave messages sent by
the connected hosts. After IGMP Proxy is configured, the stub switch is no longer a PIM neighbor but a
host for the exterior network. The Layer 3 switch receives the multicast data of corresponding groups
only when it has directly attached multicast members.
Figure 3-3 Diagram for IGMP proxy
shows an IGMP Proxy diagram for a stub network. The upstream interface, VLAN-interface 1
of Switch B is the proxy interface for the downstream interface VLAN-interface 2.
Configure Switch B as follows: