Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 27)

Multi-Service IronWare Multicast Configuration Guide 15
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Passive Multicast Route Insertion (PMRI)
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TABLE 5 Output from the show ip pim counter nsr command
Passive Multicast Route Insertion (PMRI)
To prevent unwanted multicast traffic from being sent to the CPU, 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. This feature does not apply to DVMRP traffic.
PMRI enables a Layer 3 switch running 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 device (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.
In PIM-DM:
• The route has no OIF and
• passed source RPF check and
• Device has no downstream PIM neighbor.
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.
This field... Displays...
Mcache sync The mcache NSR sync queue that carries the NSR sync message for
mcache updates.
pack The number of NSR sync messages that are packed from current MP to the
other MP.
unpack The number of NSR sync messages that are received and unpacked by the
current MP.
ack The number of NSR sync acknowledgement the current MP received.
RPset sync The RPset sync queue that carries the NSR sync message for RPset
update.
BSR status The BSR status sync queue that carries the NSR sync message for BSR
information update.