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Input 1，select address option，prompt is as below：
(00)A.B.C.D
(01)negotiated
Please Input the code of command to be excute(0-1): 0
Input 0，select A.B.C.D option，prompt is as below：
Please input a IP Address:
Input the IP address you want to assign, then prompt is as below:
Please input a IP Address:
Input mask, then prompt is as below:
(00)secondary
(01)<cr>
Please Input the code of command to be excute(0-1): 0
Input 0, select secondary option, then you have completed secondary address configuration.
Repeat the steps upwards to implement configuration of multiple IP addresses.
Note:
IP routing protocols sometimes treat secondary addresses differently when sending routing updates.
3. Enable IP Processing on a Serial Interface
You might want to enable IP processing on a serial or tunnel interface without assigning an explicit IP
address to the interface. Whenever the unnumbered interface generates a packet (for example, for a
routing update), it uses the address of the interface you specified as the source address of the IP
packet. This kind of interface is called unnumbered interface. It also uses the specified interface
address in determining which routing processes are sending updates over the unnumbered interface.
Restrictions are as follows:
Serial interfaces using HDLC, PPP, LAPB, and Frame Relay encapsulations, as well as tunnel
interfaces, can perform IP message processing without assigning IP address. But as it to a serial
interface encapsulating frame relay, it must be a point-to-point sub-interface. It is not possible to use
this function on interfaces with X.25 or SMDS encapsulations.
You cannot use the ping command to determine whether the interface is up, because the interface has
no IP address. You can use the Simple Network Management Protocol (SNMP) to monitor interface
status remotely. <![endif]>
Note:
Using an unnumbered serial line between different major networks requires special care. Any routing protocol running on the
link should be configured to advertise none information about subnets.
To enable IP processing on an unnumbered serial interface, perform the following command in
interface configuration mode:
Ip unnumbered type number
To enable IP process function on an unnumbered interface, you should select ip option in the
configuring prompt, and it will list all arguments:
(00)access-group
......
(17)unnumbered
(18)unreachables
Please Input the code of command to be excute(0-18): 17
Input 17，select unnumbered option，prompt is as below：
(00)FastEthernet
(01)Ethernet
(02)Serial
......
Please Input the code of command to be excute(0-10):
IP address
IP address negotiated over PPP or via DHCP
Make this IP address a secondary address
Command
Specify access control for packets
Enable IP processing without an explicit address
Enable sending ICMP Unreachable messages
FastEthernet interface
Ethernet interface
Serial interface
Model Name
Purpose
Enable IP process function on a serial or tunnel interface
without configuring any IP address.
- 149 -
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