
Selecting a Boot Configuration
1-9
6. The upstream router sends the IP address and subnet mask to the booting
router in a BOOTP response message.
7. The ASN assigns the IP address and subnet mask to any synchronous
interface that receives a BOOTP response.
8. The ASN stores these addresses, along with the address of the next-hop router,
in RAM.
Getting the Software Image and Configuration Files
After its gets the IP address, the ASN obtains its software image and configuration
files as follows:
1. The ASN sends a BOOTP request for the pathnames of a configuration file
and software image file.
The ASN issues this request simultaneously through all synchronous and
Ethernet interfaces that have IP addresses. It issues this request periodically
through these ports for about 3 minutes, regardless of whether a cable is
connected.
2. A BOOTP server responds to the router’s request with the directory
pathnames; the ASN stops sending BOOTP requests for the pathnames
(Figure 1-3).
The first ASN interface that processes the BOOTP response acts as the TFTP
client in the remaining steps.
Table 1-2. Sample BOOTP Client Interface Table on Upstream Router
DLCI of Incoming BOOTP
Request for IP Address Response
31 192.32.16.17
32 192.32.16.18
33 192.32.16.19
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