Dell PowerConnect 8024 - Protocol Independent Multicast

Configuring IP Multicast 755
The Interface Membership Information — Detailed page contains the following fields:
• Interface — Select the interface on which MLD proxy is enabled for which data is to be displayed.
•
Multicast Group IP — Select the IP multicast group address for which data is to be displayed. If no
group membership reports have been received on the selected MLD Proxy interface you will not be
able to make this selection, and none of the non-configurable data will be displayed.
•
Source Address — This parameter shows source addresses which are members of this multicast
address.
•
Expiry Time — Displays the expiry time in hours:minutes:seconds since the entry was created in the
cache table.
•Click Refresh to refresh the data on the screen with the present state of the data in the router.
DisplayingIPv6 MLD Membership Detailed Information Using CLI Commands
For information about the CLI command that performs this function, see the following chapter in the
CLI Reference Guide:
• IPv6 Routing Commands
The following table summarizes the equivalent CLI commands for this feature.
Protocol Independent Multicast
Protocol Independent Multicast-Dense Mode (PIM-DM) protocol is a simple, protocol-independent
multicast routing protocol. It uses an existing Unicast routing table and a Join/Prune/Graft mechanism
to build a tree. PIM-DM creates source-based shortest-path distribution trees that make use of RPF. It
cannot be used to build a shared distribution tree, as is the case in PIM-SM. PIM-DM assumes that
when a sender starts sending data, all downstream routers and hosts want to receive a multicast
datagram. PIM-DM initially floods multicast traffic throughout the network. Routers that do not have
any downstream neighbors prune back the unwanted traffic. In addition to PRUNE messages, PIM-DM
makes use of graft and assert messages. Graft messages are used whenever a new host wants to join the
group. Assert messages are used to shutoff duplicate flows on the same multi-access network.
There are two versions of PIM-DM. Version 2 doesn’t use the IGMP message; instead, it uses a message
that is encapsulated in IP package, with protocol number 103. In Version 2, Hello message is introduced
in place of query message.
PIM-DM is appropriate for:
• Densely distributed receivers
Table 12-31. IPv6 MLD Membership Detailed Information Command
CLI Command Description
show ipv6 mld-proxy groups detail Displays information about multicast groups that MLD Proxy
reported.