
Understanding Tools and Options
114084 Rev. A 1-7
During the EZ-Install process, the router obtains its address automatically, as
described next.
1. When you power on the router, it runs a set of diagnostic tests.
2. The router sends a BOOTP request to the upstream router for an IP address
and subnet mask.
The AN, ANH, or ARN issues the request through all serial ports at about the
same time, even if cables are not connected to these ports. Each port
successively tries the following protocols until it receives a response:
• Bay Networks Standard PPP using HDLC (high-level data link control)
encapsulation
• Frame Relay Annex D
• Frame Relay Local Management Interface (LMI)
• Frame Relay Annex A
The AN, ANH, or ARN makes two attempts for each protocol over each serial
interface. If one does not receive a response in approximately 4 minutes, the
router boots the image and configuration file in its local file system, as
described in the next section, “Local Boot
.”
3. The first interface on the upstream router to receive the BOOTP request
responds.
4. The upstream router calculates the IP address of the AN/ANH’s serial
interface.
The upstream router calculates the IP address based on its protocol
configuration. See Step a if the upstream router circuit is running Bay
Networks Standard or is a Frame Relay PVC in direct access mode. See Step
b if it is a Frame Relay PVC in group access mode.
a. A PVC in direct access mode or a Bay Networks Standard interface
calculates the IP address by adding 1 to the IP address of the interface that
received the request.
Note: The upstream router must have a circuit running Bay Networks
Standard Point-to-Point Protocol (PPP) using HDLC or a Frame Relay
permanent virtual circuit (PVC).
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