Configuring Remote Access for AN and Passport ARN Routers
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The router sends the BootP request through all serial ports at approximately
the same time, using the following protocols:
•Nortel Networks Standard Point-to-Point Protocol (PPP) using high-level
data link control (HDLC) encapsulation
•Frame Relay Annex D
•Frame Relay Local Management Interface (LMI)
•Frame Relay Annex A
If the AN/ANH and ARN router does not receive a response to the first BootP
request, it issues a second request.
If the AN/ANH or ARN router does not receive a response in approximately
four minutes, it boots the image and configuration files in its local file system,
as described in “Local Boot Process” on page1-12.
3. The first interface on the upstream router to receive the Bo otP request
responds.
4. The upstream router obtains the IP address of the AN/ANH or ARN router’s
serial interface. The protocol configuration of the upstream router determines
whether it calculates or requests the IP address, as follows:
-- A frame relay PVC in direct access mode or a Nortel Networks Standard
PPP interface calculates the IP address by adding 1 to the IP address of
the interface that received the request.
For example, in Figure1-1, the upstream router’s interface address is
192.32.1.1. This means that the upstream router calculates 192.32.1.2 as
the AN/ANH or ARN router’s IP address.
Note: The upstream router must have a circuit running Nortel Networks
Standard PPP using HDLC or a frame relay permanent virtual circuit (PVC).
Note: If the IP address plus 1 equals a broadcast address, the upstream router
calculates the IP address by subtracting 1. For example, if the IP address of the
upstream router’s interface is 7.255.255.254, the IP address of the AN/ANH or
ARN router is 7.255.255.253.