Enterasys Networks X-PeditionTM Trivial File Transfer Protocol Tftp, IP Interface, Secondary IP

General IP Features

hostkey.dat file unless none have been generated or the content of the file is corrupted in which case default keys are used to secure the connection.

Note: SSH is enabled by default on port 22. Be aware that with SSH enabled, traditional facilities such as FTP, TFTP, and Telnet are not disabled so to ensure system security, you must disable other communication services.

A number of SSH clients are commercially available. Enterasys recommends the PuTTY client freeware as compatible and easy to configure. For step-by-step instructions on installing PuTTY and configuring SSH, refer to “Configuring Security” in the XSR User’s Guide.

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-servertftp-server-listand 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 “Managing the XSR” on page 2-1for 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 command interface <serial fast/gigabitethernet bri dialer

loopback vpn multilink atm> sets all XSR interfaces.

•Un-numberedinterfaces 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.

Secondary IP is useful when there are insufficient host addresses on a network segment. Configuring several subnets on the router interface which connects the network segment combines these logical subnets into one physical segment making more host addresses available.

Interface & Secondary IP

The XSR supports secondary IP on Ethernet networks only. All other ports, including loopback interfaces, support one IP address per interface only.

XSR User’s Guide 5-7