Users Guide

– If the image download fails, the switch does not try to download the conguration le and starts sending requests for a new
DHCP oer from a dierent server. The previously oered server is blacklisted.
• If the oer contains only a boot image that cannot be downloaded, BMP requests another DHCP oer.
• If you enable the reload-type config-download command and the conguration le in the oer cannot be downloaded,
the switch boots up and loads the startup conguration stored in local ash memory.
DHCP Server IP Blacklist
If the process does not complete successfully, the DHCP server IP is blacklisted and the DHCP process is re-initiated. A DHCP
server is maintained in the blacklist for ten minutes. If a DHCP oer is received from the blacklisted DHCP server, the oer is
rejected.
File Server
Set up a le server and ensure connectivity.
You must congure the server that holds the boot and conguration les as the network source for the switch. The switch
recognizes HTTP, TFTP, FTP, and Flash URLs.
For example:
• tftp://serverip/filename
• tftp://hostname/filename
• ftp://user:passwd@serverip//mypath/filename
• ftp://user:passwd@hostname//mypath/filename
• http://serverip/filename
• http://hostname/filename
• flash://filename
• filename (Assumes TFTP)
When loading the Dell Networking OS image, if the Dell Networking OS image on the server is dierent from the image on the local
ash, the switch downloads the image from the server onto the local ash and reloads using that image.
Next, the switch tries to load the conguration le. If the conguration le is not specied or if you disable the config-download
parameter, the switch loads the startup-cong from the local ash.
Domain Name Server
Set up a DNS to determine the host name applied in the switch startup conguration when no conguration le is retrieved from the
DHCP server.
The DNS server is contacted only when no conguration le is contained in a DHCP server response and the host name is not
resolved from the network-cong le on the switch. For more information, refer to the Dell Networking OS Conguration Guide, the
IPv4 Addressing chapter.
Switch Boot and Set-up Behavior in Jumpstart Mode
When the switch boots up in Jumpstart mode all ports, including the 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 lename, and
conguration le from the DHCP server. For example:
1. The switch begins boot up process in Jumpstart mode (the default mode).
2. The switch sends DHCP Discover on all the interface up ports.
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.
Bare Metal Provisioning (BMP)
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