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Configuring IP Services
IP Services Configuration Examples
IPC-121
Cisco IOS IP Configuration Guide
• Time Range Applied to an IP Access List Example
• Commented IP Access List Entry Examples
• IP Accounting Example
• HSRP Load Sharing Example
• HSRP MAC Refresh Interval Examples
• HSRP MIB Trap Example
• HSRP Support for MPLS VPNs Example
• HSRP Support for ICMP Redirect Messages Example
• MNLB Forwarding Agent Examples
ICMP Services Example
The following example changes some of the ICMP defaults for the first Ethernet interface 0. Disabling
the sending of redirects could mean that you do not expect your devices on this segment to ever need to
send a redirect message. Disabling the unreachables messages will have a secondary effect—it also will
disable IP Path MTU Discovery, because path discovery works by having the Cisco IOS software send
Unreachables messages. If you have a network segment with a small number of devices and an absolutely
reliable traffic pattern—which could easily happen on a segment with a small number of little-used user
devices—you would be disabling options that your device would be unlikely to use anyway.
interface ethernet 0
no ip unreachables
no ip redirects
Simplex Ethernet Interfaces Example
The following is an example of configuring a simplex Ethernet interface. Figure 19 illustrates how to
configure IP on two routers sharing transmit-only and receive-only Ethernet connections.
Figure 19 Simplex Ethernet Connections
Router 1 Configuration
interface ethernet 0
ip address 128.9.1.1
!
interface ethernet 1
ip address 128.9.1.1
transmit-interface ethernet 0
!
!use show interfaces command to find router2-MAC-address-E0
arp 128.9.1.4 router2-MAC-address-E0 arpa
Router 2 Configuration
interface ethernet 0
Router 2
Router 1
S1064a
E0
E1
E0
E1