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Support for Multicast Multi-VRF 3
Multicast terms
The following terms are commonly used in discussing multicast-capable devices. These terms are
used throughout this chapter:
Node: Refers to a device.
Root Node: The node that initiates the tree building process. It is also the device that sends the
multicast packets down the multicast delivery tree.
Upstream: Represents the direction from which a device receives multicast data packets. An
upstream device is a node that sends multicast packets.
Downstream: Represents the direction to which a device forwards multicast data packets. A
downstream device is a node that receives multicast packets from upstream transmissions.
Group Presence: Means that a multicast group has been learned from one of the directly
connected interfaces. Members of the multicast group are present on the device.
Intermediate nodes: Devices that are in the path between source devices and leaf devices.
Leaf nodes: Devices that do not have any downstream devices.
Multicast Tree: A unique tree is built for each source group (S,G) pair. A multicast tree is comprised
of a root node and one or more nodes that are leaf or intermediate nodes.
Support for Multicast Multi-VRF
Multicast Multi-VRF support for the Brocade device includes the following:
• PIM (PIM-SM and PIM-DM) – The procedure for configuring PIM within a VRF instance is
described in “Enabling PIM for a specified VRF” on page 75 and “Enabling PIM Sparse for a
specified VRF” on page 87.
System max parameter changes
Several changes have been made to the system max commands in support of Multicast Multi-VRF.
system-max pim-mcache
The above command has been deprecated and replaced with the system-max pim-hw-mcache
command.
The following new runtime commands have been introduced:
max-mcache – This command described in “Defining the maximum number of PIM cache
entries” on page 62.
ip igmp max-group-address – This command described in “Defining the maximum number of
IGMP group addresses” on page 63 replaces the system-max igmp-max-group-address
command.
FastIron Ethernet Switch IP Multicast Configuration Guide 61
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