HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP Co - Page 128
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ip address Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands ip address Use the ip address interface configuration command to set an IP address for the Layer 2 switch. Use the no form of this command to remove an IP address or to disable IP processing. ip address ip-address subnet-mask [secondary] no ip address [ip-address subnet-mask] [secondary] Syntax Description ip-address subnet-mask secondary IP address. Mask for the associated IP subnet. (Optional) Specifies that the configured address is a secondary IP address. If this keyword is omitted, the configured address is the primary IP address. Defaults No IP address is defined. Command Modes Interface configuration Command History Release 12.2(25)SEF Modification This command was introduced. Usage Guidelines If you remove the switch IP address through a Telnet session, your connection to the switch will be lost. Hosts can find subnet masks using the Internet Control Message Protocol (ICMP) Mask Request message. Routers respond to this request with an ICMP Mask Reply message. You can disable IP processing on a particular interface by removing its IP address with the no ip address command. If the switch detects another host using one of its IP addresses, it will send an error message to the console. You can use the optional keyword secondary to specify an unlimited number of secondary addresses. Secondary addresses are treated like primary addresses, except the system never generates datagrams other than routing updates with secondary source addresses. IP broadcasts and ARP requests are handled properly, as are interface routes in the IP routing table. Note If any router on a network segment uses a secondary address, all other devices on that same segment must also use a secondary address from the same network or subnet. Inconsistent use of secondary addresses on a network segment can very quickly cause routing loops. If your switch receives its IP address from a Bootstrap Protocol (BOOTP) or a DHCP server and you remove the switch IP address by using the no ip address command, IP processing is disabled, and the BOOTP or the DHCP server cannot reassign the address. 2-100 Cisco Catalyst Blade Switch 3020 for HP Command Reference OL-8916-01