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After 10 minutes of rediscovery attempts, the server IP address is blacklisted as shown in the system log:
00:05:45:%STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/
47.
00:05:45:%STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Ma 0/0.
00:05:45:%STKUNIT0-M:CP %JUMPSTART-5-DHCP_OFFER_REJECTED: Server IP address
10.11.197.39 was previously rejected.
00:05:59:%STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/0.
00:05:59:%STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/1.
MAC-Based IP Assignment
One way to use BMP mode most efficiently is to configure the DHCP server to assign a fixed IP address, Dell Networking OS
image, and configuration file based on the switch’s MAC address.
When this is done, the same IP address is assigned to the switch even on repetitive reloads and the same configuration file is
retrieved when using the DNS server or the network-config file to determine the hostname.
The assigned IP address is only used to retrieve the files from the file server. It is discarded after the files are retrieved.
Following is an example of a configuration of the DHCP server included on the most popular Linux distributions. The dhcpd.conf
file shows assignment of a fixed IP address and configuration file based on the MAC address of the switch.
Description
Parameter Example
option boot-filename code 67 = text;
option tftp-server-address code 150 = ip-address;
option config-file code 209 = text;
subnet 10.20.30.0 netmask 255.255.255.0 { option domain-name-servers
20.30.40.1, 20.30.40.2;
BMP 2.0 Syntax
host S4810-1 {
MAC to IP
mapping
hardware ethernet 00:01:e8:8c:4d:0e; fixed-address 10.20.30.41;
Dell Networking
OS image
option boot-filename "tftp://10.20.4.1/FTOS-SE-8.3.10.1.bin";
Config file
option config-file "http://10.20.4.1/S4810-1.conf";}
host S4810-2 {
BMP1.0 syntax
hardware ethernet 00:01:e8:8c:4c:04;
MAC to IP
mapping
fixed-address 10.20.30.42;
Dell Networking
OS image
option tftp-server-address 10.20.4.1;
Config file
filename "FTOS-SE-8.3.10.1.bin"; option config-file "S4810-2.conf"; }
DHCP Retry Mechanism
BMP can request different DHCP offers
BMP requests a different DHCP offer in the following scenarios:
● If you enter the reload-type jump-start config-download enable command, the DHCP offer specifies both
the boot image and the configuration file.
○ If either the image or the configuration download is successful, BMP does not request another DHCP offer.
○ If the image download is successful but the configuration download fails, the switch boots up with the default
configuration.
○ If the image download fails, the switch does not try to download the configuration file and starts sending requests for a
new DHCP offer from a different server. The previously offered server is blacklisted.
214
Bare Metal Provisioning (BMP)