Dell PowerConnect B-RX - Passive Multicast Route Insertion (PMRI)

1258 BigIron RX Series Configuration Guide
53-1002253-01
IPv6 PIM sparse
49
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 “Displaying IPv6 PIM-sparse configuration information” on page 1258.
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
• 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
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.
Configuring PMRI
PMRI is enabled by default. To disable PMRI, enter commands such as the following.
BigIron RX(config)# ipv6 router pim
BigIron RX(config-ipv6-pim-router)# hardware-drop-disable
Syntax: [no] hardware-drop-disable
Displaying hardware-drop
Use the show ipv6 pim sparse command to display if the hardware-drop feature has been enabled
or disabled.