
Configuring IP Routers and Interfaces
2-15
The IP router includes a client and server implementation of TFTP, enabling the
router to transmit and receive files across an Internet.
Defining a Circuitless IP Interface
A circuitless IP interface has an IP address that is not mapped to the address of a
specific circuit. If one or more of the router’s IP interfaces become disabled, this
circuitless feature ensures that the router is always reachable using the circuitless
IP interface address, as long as a viable path to the router exists. The IP router can
support one circuitless IP interface.
IP traffic is delivered to and transmitted from the circuitless interface in the same
way as any other IP interface. In addition, the circuitless IP interface can receive
packets from any application.
When you configure a circuitless IP interface, note the following:
• You can configure one circuitless IP interface per router. Additional circuitless
IP interfaces will not initialize.
• You can add IP routing protocols to the circuitless interface. (The current
version of Site Manager allows you to add BGP and OSPF to a circuitless
interface.)
• You must assign a unique IP address and subnetwork number to the circuitless
IP interface.
• You cannot configure a circuitless IP interface in nonforwarding mode.
For instructions on using Site Manager to specify the operating characteristics of TFTP on
a router, see “Editing TFTP Parameters” on page 2-73.
For instructions on using Site Manager to define a circuitless interface and add BGP and
OSPF to the interface, see “Configuring a Circuitless IP Interface” on page 2-62.
Site Manager allows you to specify the slots on which support for the circuitless interface
is enabled. For instructions, see the Slot Mask parameter on page 2-47.
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