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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 10 Checking Port Status and Connectivity
Configuring ICMP
However, when Hot Standby Router Protocol (HSRP) is configured on an interface, ICMP Redirect
messages are disabled (by default) for the interface. For more information on HSRP, refer to the
following URL:
http://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_hsrp_ps6350_TSD_Products_Confi
guration_Guide_Chapter.html
To enable the sending of ICMP Redirect messages if the Cisco IOS software is forced to resend a packet
through the same interface on which it was received, enter the following command in interface
configuration mode:
Enabling ICMP Mask Reply Messages
Occasionally, network devices must know the subnet mask for a particular subnetwork in the
internetwork. To obtain this information, devices can send ICMP Mask Request messages. These
messages are responded to by ICMP Mask Reply messages from devices that have the requested
information. The Cisco IOS software can respond to ICMP Mask Request messages if the ICMP Mask
Reply function is enabled.
To have the Cisco IOS software respond to ICMP mask requests by sending ICMP Mask Reply
messages, enter the following command:
Command Purpose
Switch (config-if)# [no] ip redirects
Enables ICMP Redirect messages.
Use the no keyword to disable the ICMP Redirect
messages and reduce CPU usage.
Command Purpose
Switch (config-if)# [no] ip mask-reply
Enables response to ICMP destination mask requests.
Use the no keyword to disable this functionality.
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