“no ip bootp server” vs “ip dhcp bootp ignore”

October 20, 2008 at 4:12 pm | Posted in Blogroll, IOS services | 1 Comment

Are there any differences btw these two commands?

no ip bootp server
ip dhcp bootp ignore

From the command reference, it looks like that the later is just a newer command, that replaces the privious legacy one.

For this sort of new command introduction, no matter how I type (e.g. for IP SLA, RTR, SAA) I would expect the config appears in IOS in the newest format.

However, when I type the old command command “no ip bootp server” in IOS, it appears exactly as I type, and not the the newer command “ip dhcp bootp ignore”, as I would expect.

Cisco IOS IP Addressing Services Command Reference

ip dhcp bootp ignore

To enable a Dynamic Host Configuration Protocol (DHCP) server to selectively ignore and not reply to received Bootstrap Protocol (BOOTP) request packets, use the ip dhcp bootp ignore command in global configuration mode. To return to the default behavior, use the no form of this command.

ip dhcp bootp ignore
Usage Guidelines
A DHCP server can forward ignored BOOTP request packets to another DHCP server if the ip helper-address command is configured on the incoming interface. If the ip helper-address command is not configured, the router will drop the received BOOTP request.

Cisco IOS Configuration Fundamentals Command Reference

ip bootp server

To enable the Bootstrap Protocol (BOOTP) service on your routing device, use the ip bootp server command in global configuration mode. To disable BOOTP services, use the no form of the command.

ip bootp server
no ip bootp server

12.2(8)T  The ip dhcp bootp ignore command was introduced.

Usage Guidelines

By default, the BOOTP service is enabled. When disabled, the no ip bootp server command will appear in the configuration file.

The integrated Dynamic Host Configuration Protocol (DHCP) server was introduced in Cisco IOS Release 12.0(1)T. Because DHCP is based on BOOTP, both of these services share the “well-known” UDP server port of 67 (per RFC 951, RFC 1534, and RFC 2131; the client port is 68). To disable DHCP services (DHCP relay and DHCP server), use the no service dhcp command. To disable BOOTP services (in releases 12.2(8)T and later), but leave DHCP services enabled, use the ip dhcp bootp ignore command.

If both the BOOTP server and DHCP server are disabled, “ICMP port unreachable” messages will be sent in response to incoming requests on port 67, and the original incoming packet will be discarded. If DHCP is enabled, using the no ip bootp server command by itself will not stop the router from listening on UDP port 67.

Examples

In the following example, BOOTP and DHCP services are disabled on the router:

Router(config)# no ip bootp server 
Router(config)# no service dhcp
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    “no ip bootp server” vs “ip dhcp bootp ignore” | Cisco Notepad


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