Bootp Requests And Parameters - Cabletron Systems SmartSTACK STS16-20RM Installation And User Manual

BootP Requests and Parameters

When using BootP to determine its IP address, the switch repeats BootP requests at
regular intervals, beginning at one second each and eventually decreasing to every
five minutes over time until it receives a valid reply. If the IP display for the VLAN
is accessed from the console (or via Telnet from another VLAN) during that time,
the switch may cease using BootP if the parameters are set (on menu exit) in such
a way that BootP would no longer be necessary - for instance, if the IP state is
switched from BootP Always to IP-Disabled or if an IP address different from
0.0.0.0 or 192.0.2.1 is specified in any IP state.
Once the switch has stopped sending BootP requests on a VLAN, it does not restart
sending requests on that VLAN and does not recognize BootP responses on that
VLAN unless the VLAN enters a state where it would be necessary again.
Besides the switch's IP address, several other parameters in a BootP response are
also recognized and recorded in NVRAM, when received in the same response:
•
Default Gateway (see the note on this page)
•
Subnet Mask
•
TFTP Main Code File Name
•
TFTP Server Address (only recognized if the Bootfile name is present)
One other parameter, the TFTP VLAN, is inferred whenever a TFTP Bootfile name
is present in the BootP response. That is, if the switch receives a BootP response
that specifies a TFTP Bootfile name, the switch automatically records the VLAN
on which the response was received as the TFTP VLAN number. Therefore, the
bootfile name should not be specified on a VLAN from which the TFTP server
cannot be accessed, either directly or through the VLAN's default gateway (if one
exists). More information on TFTP is available under the section "TFTP" on page
148 in this chapter.
Note: The default gateway accepted is the first one in the list of routers whose net/
subnet address is the same as that of the IP address specified. If no routers are
specified or if none qualify, the gateway address for the VLAN will be zeroed out
and recorded as such in NVRAM when the IP screen is exited.
Switch Configuration SmartStack STS16-20RM/STS16-20FRM Token Ring Switches, P/N: 9032957-01
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