Configuring Broadcast Packet Handling - Cisco Catalyst 9500 series Configuration Manual

Configuring IP Unicast Routing
Step 10
Step 11
Step 12
Step 13

Configuring Broadcast Packet Handling

Perform the tasks in these sections to enable these schemes:
• Enabling Directed Broadcast-to-Physical Broadcast Translation
• Forwarding UDP Broadcast Packets and Protocols
• Establishing an IP Broadcast Address
• Flooding IP Broadcasts
Enabling Directed Broadcast-to-Physical Broadcast Translation
By default, IP directed broadcasts are dropped; they are not forwarded. Dropping IP-directed broadcasts makes
routers less susceptible to denial-of-service attacks.
You can enable forwarding of IP-directed broadcasts on an interface where the broadcast becomes a physical
(MAC-layer) broadcast. Only those protocols configured by using the ip forward-protocol global configuration
command are forwarded.
You can specify an access list to control which broadcasts are forwarded. When an access list is specified,
only those IP packets permitted by the access list are eligible to be translated from directed broadcasts to
Command or Action
ip irdp address address [number]
Example:
Device(config-if)# ip irdp
address 10.1.10.10
end
Example:
Device(config)# end
show ip irdp
Example:
Device# show ip irdp
copy running-config startup-config
Example:
Device# copy running-config
startup-config
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
Configuring Broadcast Packet Handling
Purpose
(Optional) Specifies an IRDP address and preference
to proxy-advertise.
Returns to privileged EXEC mode.
Verifies settings by displaying IRDP values.
(Optional) Saves your entries in the configuration file.
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