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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 13 Configuring CEF for PFC2 and PFC3A
Configuring the MLS IP-Directed Broadcasts on the Switch
With software release 7.2(2) and later releases, you can configure MSFC2 to handle the IP-directed
broadcasts in the hardware using PFC2.
Note Cisco IOS Release 12.1(11b)E is required on MSFC2.
This example shows how to enable the IP-directed broadcasts:
Router(config-if)# mls ip directed-broadcast ?
exclude-router exclude router from recepient list for directed broadcast
include-router include router in recepient list for directed broadcast
The exclude-router option forwards the IP-directed broadcast packet in the hardware to all the hosts in
the VLAN except the router.
The include-router option forwards the IP-directed broadcast packet in the hardware to all the hosts in
the VLAN including the router. With this option, the router does not forward the IP-directed broadcast
packet again.
The no form of the command is as follows:
Router(config-if)# no mls ip directed-broadcast [exclude-router | include-router]
The no form returns the interface configuration to the default mode. In the default mode, the IP-directed
broadcast packets are not hardware forwarded. They are handled at the process level by MSFC2. The
MSFC2 decision to forward or not forward the packet depends on the ip directed-broadcast command
configuration.
There is no interaction between the ip directed-broadcast command and the mls ip directed-broadcast
command. The ip directed-broadcast command involves software forwarding and the mls ip
directed-broadcast command involves hardware forwarding.
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