Passive Multicast Route Insertion (Pmri) - Dell PowerConnect B-RX Configuration Manual

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IPv6 PIM sparse
With Source-specific multicast (SSM), the "channel" concept is introduced where a "channel"
consists of a single source and multiple receivers who specifically register to get broadcasts from
that source. Consequently, receivers are not burdened with receiving data they have no interest in,
and network bandwidth requirements are reduced because the broadcast need only go to a
sub-set of users. The address range ff30::/12 has been assigned by the Internet Assigned
Numbers Authority (IANA) for use with SSM.
SSM simplifies PIM-SM by eliminating the RP and all protocols related to the RP.
Configuring source-specific multicast
PIM-SM must be enabled on any ports that you want SSM to operate. Enter the ssm-enable
command under the IPv6 router PIM level to globally enable source specific multicast filtering.
BigIron RX(config)# ipv6 router pim
BigIron RX(config-ipv6-pim-router)# ssm-enable
Syntax: [no] ssm-enable
Displaying IPv6 PIM-sparse configuration information
To display IPv6 PIM Sparse configuration information, use the show ipv6 pim sparse command as
described in

Passive Multicast Route Insertion (PMRI)

To prevent unwanted multicast traffic from being sent to the CPU, IPv6 PIM Routing and Passive
Multicast Route Insertion (PMRI) can be used together to ensure that multicast streams are only
forwarded out ports with interested receivers and unwanted traffic is dropped in hardware on Layer
3 Switches running software release 03.6.00 and later.
PMRI enables a Layer 3 switch running IPv6 PIM Sparse to create an entry for a multicast route
(e.g., (S,G)), with no directly attached clients or when connected to another PIM router (transit
network).
When a multicast stream has no output interfaces, the Layer 3 Switch can drop packets in
hardware if the multicast traffic meets either of the following conditions:
In PIM-SM
If the OIF is inserted after the hardware-drop entries are installed, the hardware entries will be
updated to include the OIFs.
NOTE
Disabling hardware-drop does not immediately take away existing hardware-drop entries, they will
go through the normal route aging processing when the traffic stops.
1248
"Displaying IPv6 PIM-sparse configuration information"
•
The route has no OIF and
•
If directly connected source passed source RPF check and completed data registration
with RP or
•
If non directly connected source passed source RPF check
on page 1248.
BigIron RX Series Configuration Guide
53-1001810-01