Enabling Installation Of Directly Connected Subnets; Specifying The Flow Statistics Message Interval; Enabling Shortcut-Consistency Checking - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Configuring IPv4 Multicast Layer 3 Switching

Enabling Installation of Directly Connected Subnets

In PIM sparse mode, a first-hop router that is the designated router for the interface may need to
encapsulate the source traffic in a PIM register message and unicast it to the rendezvous point. To prevent
new sources for the group from being learned in the routing table, the (*,G) flows should remain as
completely hardware-switched flows. When (subnet/mask, 224/4) entries are installed in the hardware,
the FIB allows both (*,G) flows to remain completely hardware-switched flows, and new, directly
connected sources to be learned correctly. The installation of directly connected subnets is enabled
globally by default. One (subnet/mask, 224/4) is installed per PIM-enabled interface.
To view FIB entries, enter the show mls ip multicast connected command.
To enable installation of directly connected subnets, perform this task:
Command
Router(config)# mls ip multicast connected
Router(config)# no mls ip multicast connected
This example shows how to enable installation of directly connected subnets:
Router(config)# mls ip multicast connected
Router(config)#

Specifying the Flow Statistics Message Interval

By default, the supervisor engine forwards flow statistics messages to the PISA every 25 seconds. The
messages are forwarded in batches, and each batch of messages contains statistics for 25 percent of all
flows. If you leave the interval at the default of 25 seconds, it will take 100 seconds to forward statistics for
all flows to the PISA.
To specify how often flow statistics messages forwarded from the supervisor engine to the PISA,
perform this task:
Command
Router(config)# mls ip multicast flow-stat-timer num
Router(config)# no mls ip multicast flow-stat-timer num
This example shows how to configure the supervisor engine to forward flow statistics messages to the
PISA every 10 seconds:
Router(config)# mls ip multicast flow-stat-timer 10
Router(config)#

Enabling Shortcut-Consistency Checking

When you enable the shortcut-consistency checking feature, the multicast route table and the
multicast-hardware entries are checked for consistency, and any inconsistencies are corrected. You can
view inconsistencies by entering the show mls ip multicast consistency-check command.
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
25-12
Chapter 25 Configuring IPv4 Multicast Layer 3 Switching
Purpose
Enables installation of directly connected subnets.
Disables installation of directly connected subnets.
Purpose
Specifies how the supervisor engine forwards flow
statistics messages to the PISA.
Restores the default.
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