Reference Guide

Bare Metal Provisioning 2.0 | 259
Domain Name Server
Set up a Domain Name Server (DNS) to determine the host name applied in the switch startup
configuration when no configuration file is retrieved from the DHCP server. The DNS server is contacted
only when no configuration file is contained in a DHCP server response and the host name is not resolved
from the network-config file on the switch. Refer to the Dell Networking OS Configuration Guide IPv4
Addressing chapter, Resolution of Host Names for information.
Switch boot and set-up behavior in Jumpstart Mode
When the switch boots up in jumpstart mode all ports, including management ports, are placed in L3 mode
in a
no shut state. The switch acts as a DHCP client on these ports for a period of time (dhcp-timeout). This
allows the switch time to send out a DHCP DISCOVER on all the
interface up ports to the DHCP Server in
order to obtain its IP address, boot image filename and configuration file from the DHCP server.
1. The switch begins boot up process in jumpstart mode (default mode)
2. The switch sends DHCP discovery messages on all the interface ports that are up.
00:01:31: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Ma 0/0.
00:01:31: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/0.
00:01:31: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/5.
00:01:31: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/6.
00:01:47: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/8.
00:01:47: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Te 0/35.
00:01:47: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Fo 0/56.
00:01:47: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Fo 0/60.
00:01:47: %STKUNIT0-M:CP %JUMPSTART-5-JUMPSTART_DISCOVER: DHCP DISCOVER sent on Ma 0/0.
3. The IP address, boot image filename and the configuration filename are reserved for the switch and
provided in the DHCP reply (one-file read method). The switch receives its IP address, subnet mask,
DHCP server IP, TFTP server address, DNS server IP, bootfile name and the configuration filename
from the DHCP server.
If a DHCP offer has no image and no configuration file path, it is considered an invalid BMP DHCP
offer and the offer is ignored. Afterwards, the first DHCP offer with an IP address, Dell Networking
OS image and configuration file, or IP address and Dell Networking OS image, or IP address and
configuration file is chosen.
• If a DHCP offer contains only an IP address and a configuration file but no image path, the switch
downloads only the configuration file and boot up with the default image.
• If a DHCP offer contains only an IP address and image file path but no configuration file path, the
switch downloads only the image and boots up with the default configuration.
4. The DHCP offer is selected. All other ports are set to shutdown mode.
00:01:33: %STKUNIT0-M:CP %JUMPSTART-5-DHCP_OFFER: DHCP acquired IP 30.0.0.20 mask 255.255.0.0 server
IP 30.1.1.1.
00:01:33: %STKUNIT0-M:CP %JUMPSTART-5-DHCP_OFFER: DHCP tftp IP 30.0.0.1 dns IP 30.0.0.1 router IP
30.0.0.14.
00:01:33: %STKUNIT0-M:CP %JUMPSTART-5-DHCP_OFFER: DHCP image file Dell-SE-9.1(1.0).bin.
00:01:33: %STKUNIT0-M:CP %JUMPSTART-5-DHCP_OFFER: DHCP config file pt-s5000-12.
00:01:33: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Ma 0/0
00:01:34: %STKUNIT0-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Ma 0/0
00:01:34: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 0/0
00:01:34: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 0/1
00:01:34: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 0/2