User`s guide

70 XSR User’s Guide
General IP Features Chapter 5
Configuring IP
Trivial File Transfer Protocol (TFTP)
TFTP is a bare bones file transfer protocol, as defined by RFC-1350, using
UDP to simplify transport with less overhead. The XSR provides TFTP client
functionality using the
snmp-server tftp-server-list and copy <file>
commands. Always enabled on the router, it is useful to save and restore
configuration files and images.
Refer to the XSR CLI Reference Guide and the Managing the XSR chapter in this
manual for more information.
IP Interface
IP interfaces are virtual circuits used to pass traffic between a physical port
and the XSR forwarder. IP interfaces have the following characteristics:
 Numbered interfaces have IP addresses assigned to them.
 The port can be pinged to monitor its status with the
ping command.
 Some routing protocols require the interface to have an IP address.
 The
interface <serial | fastethernet/gigabitethernet |
dialer | loopback dialer | vpn>
command sets all XSR ports.
 The XSR supports a total of 42 interfaces.
 Un-numbered interfaces are not assigned IP addresses
– Un-numbered interfaces may be used on point-to-point
networks. By default, the address used by the unnumbered
interface when it generates a packet is the router ID, which is the
address of the highest, non-zero configured loopback interface.
An unnumbered interface address can be configured to be the
address of a specified numbered interface. The
ip unnumbered
command sets interface parameters on the XSR.
– An un-numbered interface cannot be pinged to monitor its status.
Secondary IP
Enabling secondary IP allows multiple IP addresses to be configured on the
same physical network interface and multiple subnets to share one MAC
address. Secondary addresses are treated largely like primary addresses, but
not exactly the same, as explained below.