Nortel Networks 14.2 manual Guidelines for Using Packet Capture

Troubleshooting Network Boot Problems

Guidelines for Using Packet Capture

Use the Packet Capture utility to view incoming or outgoing BootP or TFTP packets and isolate errors to a specific router interface. This utility is available through the Technician Interface on routers running BayRS Version 7.80 or later.

See Using Technician Interface Software for instructions on how to use Packet Capture. See Configuring SNMP, BootP, DHCP, and RARP Services for a description of BootP packets.

Note: The instructions that follow assume that BayRS Version 7.80 or later is running on all routers in the path between the AN/ANH or ARN router and the BootP server.

Use Packet Capture as follows:

1.Test the BootP server’s next-hop router in the path to the AN/ANH or ARN router.

2.Test the upstream router’s interface to the AN/ANH or ARN router.

3.Test the upstream router’s interface to the next-hop router.

4.Test the interfaces that receive and forward the BootP and TFTP packets of the routers between the AN/ANH or ARN router and the next-hop router.

5.Continue testing each router in the path until you isolate the problem interface.

Guidelines for Using a LAN Protocol Analyzer

See the following guidelines when you use a LAN protocol analyzer:

•If the netboot is failing, connect the analyzer to the BootP server interface to determine whether it is receiving and responding to BootP and TFTP requests.

To read the ASCII translation, view the BootP reply packets for the configuration file path name in hexadecimal mode.

Note: The LAN protocol analyzer does not decode all of the vendor tag fields.

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