Interaction With Remote Auto Install (Rai); Dhcp Client Timeouts - Enterasys Security Router X-PeditionTM User Manual

Primary and secondary IP addresses on the same interface are not permitted within the same
subnet nor are they allowed within the same subnets already occupied by other interfaces. Also,
the primary IP address must be configured before any secondary address is configured. If the
primary address is DHCP negotiated, its address and mask are unknown until a DHCP server
supplies such addresses.

Interaction with Remote Auto Install (RAI)

When DHCP Client negotiation is conducted during the RAI operations, minor differences occur
in comparison to how the functionality behaves otherwise. The Parameters Request List will contain
the following:
• Subnet Mask
• Routers
• Domain Name Servers
• Host Name
• Bootfile Name
• TFTP Server Address
A timer starts when DHCP Client is created on an interface. Upon the timer's expiration, DHCP
Client shuts down, informing RAI that address negotiation has failed and, in this case, is never
restarted. RAI then attempts auto install on other interfaces.
In addition to RAI obtaining the address/mask in conventional fashion, the following data is also
obtained when available:
• hostname of the router - (Option 12)
• file name (in order of preference) - file field or Option 67 (Bootfile Name)
• IP address of the TFTP server (in order of preference) - Option 150 (TFTP Server address) or
siaddr field
For more information on RAI, refer to

DHCP Client Timeouts

The XSR supports the following default FSM (Finite State Machine) timeouts:
Table 15-3 FSM Timeouts
Timeout
Retry interval
Select interval
Reboot timeout
Initial interval
Backoff cutoff
"Managing the XSR"
Default Description
300 seconds Interval to re-enter Initial State if no lease
0 seconds (accepts Interval to accumulate OFFER messages from different servers
first valid response)
10 seconds Interval to enter Initial State from Rebooting State if no ACK/NAK
received
3 seconds Exponential backoff period starting with this value
15 seconds Peak backoff period
DHCP Client Services
on page 2-1.
XSR User's Guide 15-7