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User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 59 Configuring Router Interfaces
Advanced Interface Settings Page
Interface Throughput Delay The expected delay for the interface in tens of microseconds (for
example, 3000 translates to 30,000 microseconds). You can enter a
value between 1 and 16777215, and the default varies by the type of
interface.
Higher-level protocols might use delay information to make operating
decisions. For example, IGRP can use delay information to
differentiate between a satellite link and a land link. This setting is for
informational purposes only and does not affect the actual delay on the
interface.
Cisco Discovery Protocol
settings
Settings related to the Cisco Discovery Protocol (CDP). CDP is a
media- and protocol-independent device-discovery protocol that runs
on all Cisco-manufactured equipment including routers, access servers,
bridges, and switches. It is primarily used to obtain protocol addresses
of neighboring devices and to discover the platform of those devices.
The options are:
• Enable CDP—Whether to enable the Cisco Discovery Protocol
(CDP) on this interface. You cannot enable CDP on ATM
interfaces.
• Log CDP Messages—On Ethernet interfaces, whether to log
duplex mismatches for this interface.
ICMP Messages Settings
Enable Redirect Messages Whether to enable the sending of Internet Control Message Protocol
(ICMP) redirect messages if the device is forced to resend a packet
through the same interface on which it was received to another device
on the same subnet. Redirect messages are sent when the device wants
to instruct the originator of the packet to remove it from the route and
substitute a different device that offers a more direct path to the
destination.
Enable Unreachable
Messages
Whether to enable the sending of ICMP unreachable messages.
Unreachable messages are sent in two circumstances:
• If the interface receives a nonbroadcast packet destined for itself
that uses an unknown protocol, the interface sends an ICMP
unreachable message to the source.
• If the device receives a packet that it cannot deliver to its ultimate
destination because it knows of no route to the destination address,
it sends an ICMP host unreachable message to the originator of the
packet.
Note This is the only advanced setting supported by the null0
interface.
Enable Mask Reply
Messages
Whether to enable the sending of ICMP mask reply messages. Mask
reply messages are sent in response to mask request messages, which
are sent when a device needs to know the subnet mask for a particular
subnetwork.
Table 59-6 Advanced Interface Settings Dialog Box (Continued)
Element Description