C
HAPTER
2
| Initial Switch Configuration
Basic Configuration
– 68 –
To successfully transmit a bootup configuration file to the switch the DHCP
daemon (using a Linux based system for this example) must be configured
with the following information:
◆ Options 60, 66 and 67 statements can be added to the daemon’s
configuration file.
◆ By default, DHCP option 66/67 parameters are not carried in a DHCP
server reply. To ask for a DHCP reply with option 66/67 information, the
DHCP client request sent by this switch includes a “parameter request
list” asking for this information. Besides, the client request also
includes a “vendor class identifier” that allows the DHCP server to
identify the device, and select the appropriate configuration file for
download. This information is included in Option 55 and 124.
The following configuration examples are provided for a Linux-based DHCP
daemon (dhcpd.conf file). The server will reply with Options 66/67
encapsulated in Option 43. Note that in the “Vendor class one” section,
if the DHCP request packet's vendor class identifier matches that specified
in this file, the server will send Option 43 encapsulating Option 66 and 67
in the DHCP reply packet. In the “Vendor class two” section, the server will
always send Option 66 and 67 to tell switch to download the “test2”
configuration file from server 192.168.255.101.
ddns-update-style ad-hoc;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
server-name "Server1";
Server-identifier 192.168.255.250;
#option 43 with encapsulated option 66, 67
option space dynamicProvision code width 1 length 1 hash size 2;
option dynamicProvision.tftp-server-name code 66 = text;
option dynamicProvision.bootfile-name code 67 = text;
Table 3: Options 60, 66 and 67 Statements
Option
Statement
Keyword Parameter
60 vendor-class-identifier a string indicating the vendor class identifier
66 tftp-server-name a string indicating the tftp server name
67 bootfile-name a string indicating the bootfile name
Table 4: Options 55 and 124 Statements
Option
Statement
Keyword Parameter
55 dhcp-parameter-request-list a list of parameters, separated by ','
124 vendor-class-identifier a string indicating the vendor class identifier
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