BelAir100SN User Guide
BelAir100SN Auto-configuration
May 31, 2010
Confidential
Document Number BDTM11001-A01 Released
• DNS server IP addresses. Up to two DNS servers are supported. See
“Configuring the Domain Name System Lookup Service” on page 46
.
• IP address for a time server. Two time servers are supported for use by the
SNTP service. See
“Managing an SNTP Server” on page 49
• time offset value used by the SNTP service. See
.
Through DHCP Option 43, the BelAir100SN provides the DHCP server with
the following parameters about the itself:
• assembly code, as shown with the
/system/show phyinv
command
• serial number, as shown with the
/system/show phyinv
command
• MAC address
• version of the active software load, as shown with the
/system/show loads
command
• GPS coordinates, as shown with the
/system/show coordinates
command
• switch name, as shown with the
/system/show system-id
command
• custom field 1, as shown with the
/system/show custom fields
command
You can use the information from DHCP Option 55 to configure the
BelAir100SN management interface or one of its VLAN interfaces.
After the BelAir100SN receives these parameters, it configures the interface in
question. At startup, it downloads the script file from the TFTP server and
executes it.
DHCP options can only be enabled for one interface. For example, if you
enable DHCP options for the management interface, you are prevented from
enabling them for a VLAN interface until you first disable them for the
management interface.
By default, the BelAir100SN rejects all parameters provided by the DHCP
server. However, you can configure the BelAir100SN to accept or reject any
individual parameter. By accepting only specific parameters, you can control
how much of the BelAir100SN is auto-configured. For example, if you do not
want to use a script file from the TFTP server, you can set the
accept-tftp-download
parameter to
disabled
.