To configure extended BOOTP requests for asynchronous interfaces as defined in RFC 1084, use the async-bootp global configuration command. Use the no form of this command to restore the default.
async-bootp tag [: hostname] data
no async-bootp
tag Item being requested; expressed as filename, integer, or IP dotted-decimal address. See Table 38 for possible keywords.
: hostname (Optional) This entry applies only to the host specified. The argument : hostnameaccepts both an IP address and a logical host name.
data List of IP addresses entered in dotted-decimal notation or as logical host names, a number, or a quoted string.
If no extended BOOTP commands are entered, the Cisco IOS software generates a gateway and subnet mask appropriate for the local network.
Global configuration
| Release | Modification | 10.0 | This command was introduced. |
|---|
Use the EXEC command show async-bootp to list the configured parameters. Use the no async-bootp command to clear the list.
Table 38 lists the possible keywords for the tag argument.
| Keyword | Description |
| bootfile | Specifies use of a server boot file from which to download the boot program. Use the optional :hostnameand dataarguments to specify the filename. |
| subnet-mask mask | Dotted-decimal address specifying the network and local subnetwork mask (as defined by RFC 950). |
| time-offset offset | Signed 32-bit integer specifying the time offset of the local subnetwork in seconds from Universal Coordinated Time (UTC). |
| gateway address | Dotted-decimal address specifying the IP addresses of gateways for this subnetwork. A preferred gateway should be listed first. |
| time-server address | Dotted-decimal address specifying the IP address of time servers (as defined by RFC 868). |
| IEN116-server address | Dotted-decimal address specifying the IP address of name servers (as defined by IEN 116). |
| nbns-server address | Dotted decimal address specifying the IP address of Windows NT servers. |
| DNS-server address | Dotted-decimal address specifying the IP address of domain name servers (as defined by RFC 1034). |
| log-server address | Dotted-decimal address specifying the IP address of an MIT-LCS UDP log server. |
| quote-server address | Dotted-decimal address specifying the IP address of Quote of the Day servers (as defined in RFC 865). |
| lpr-server address | Dotted-decimal address specifying the IP address of Berkeley UNIX Version 4 BSD servers. |
| impress-server address | Dotted-decimal address specifying the IP address of Impress network image servers. |
| rlp-server address | Dotted-decimal address specifying the IP address of Resource Location Protocol (RLP) servers (as defined in RFC 887). |
| hostnamename | The name of the client, which may or may not be domain qualified, depending upon the site. |
| bootfile-size value | A two-octet value specifying the number of 512-octet (byte) blocks in the default boot file. |
The following example illustrates how to specify different boot files: one for a PC, and one for a Macintosh. With this configuration, a BOOTP request from the host on 172.30.1.1 results in a reply listing the boot filename as pcboot. A BOOTP request from the host named mac results in a reply listing the boot filename as macboot.
async-bootp bootfile :172.30.1.1 "pcboot" async-bootp bootfile :mac "macboot"
The following example specifies a subnet mask of 255.255.0.0:
async-bootp subnet-mask 255.255.0.0
The following example specifies a negative time offset of the local subnetwork of -3600 seconds:
async-bootp time-offset -3600
The following example specifies the IP address of a time server:
async-bootp time-server 128.128.1.1
| Command | Description |
|---|---|
| show async-bootp | Displays the extended BOOTP request parameters that have been configured for asynchronous interfaces. |
Printed for apswan@ctr.ap.nic.in on Wed Mar 5 22:32:57 PST 2003
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