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Remote Network Boot via PXE using EX Switch

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Article ID: KB16941 KB Last Updated: 04 Mar 2017Version: 2.0
Summary:
Remote network boot via PXE is used in Avaya IP phone and call manager environments where the phone might have to pick up boot image/firmware, or config file, from another server or call manager after gaining IP address from DHCP server (EX Switch).

Symptoms:
Devices are required to obtain an IP address from the DHCP server (EX Switch as DHCP Server) and then to contact the TFTP server to download the boot file.



Solution:
Remote network boot via PXE is used in Avaya IP phones and call manager environments, where the phone might have to pick up boot image/firmware, or config file, from another server or call manager after gaining IP address from DHCP server (EX Switch).  The following provides an example of this setup and solution.
  • Connect TFTP server (10.16.13.5/24) to EX Switch
  • Configure all the DHCP global parameters (Server Information and Lease Time and Boot Options) either through J-web or through CLI (use the example below)
  • Include the next-server attribute under the DHCP hierarchy.

Use the following configuration on the EX Switch to verify solution:

#set system services dhcp next-server <TFTP_SERVER_IP>

NOTE: The "next-server" attribute will not be found on J-web so you need to use CLI to configure this attribute(next-server).

Configuration Example:

system {
dhcp {
maximum-lease-time 691200;
default-lease-time 691200;
domain-name juniper.local;
name-server {
10.16.13.7;
10.16.13.13;
}
boot-file pxetest.0;
boot-server 10.16.13.5;
next-server 10.16.13.5;
pool 172.16.100.0/24 {
address-range low 172.16.100.100 high 172.16.100.250;
router {
172.16.100.1;
}
}


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