Installation and Getting Started Guide
If you specify a loopback interface as the single source for Telnet packets, Telnet servers can receive the
packets regardless of the states of individual links. Thus, if a link to the Telnet server becomes unavailable
but the client or server can be reached through another link, the client or server still receives the packets, and
the packets still have the source IP address of the loopback interface.
The software contains separate CLI commands for specifying the source interface for Telnet, TACACS/
TACACS+, and RADIUS packets. You can configure a source interface for one or more of these types of packets.
To specify an Ethernet port or a loopback or virtual interface as the source for all Telnet packets from the device,
use the following CLI method. The software uses the lowest-numbered IP address configured on the port or
interface as the source IP address for Telnet packets originated by the device.
USING THE CLI
To specify the lowest-numbered IP address configured on a virtual interface as the device's source for all Telnet
packets, enter commands such as the following:
HP9300(config)# int loopback 2
HP9300(config-lbif-2)# ip address 10.0.0.2/24
HP9300(config)# ip telnet source-interface loopback 2
The commands in this example configure loopback interface 2, assign IP address 10.0.0.2/24 to the interface,
then designate the interface as the source for all Telnet packets from the routing switch.
Syntax: ip telnet source-interface ethernet <portnum> | loopback <num> | ve <num>
The <num> parameter is a loopback interface or virtual interface number. If you specify an Ethernet port, the
<portnum> is the port's number (including the slot number, if you are configuring a chassis device).
The following commands configure an IP interface on an Ethernet port and designate the address port as the
source for all Telnet packets from the routing switch.
HP9300(config)# interface ethernet 1/4
HP9300(config-if-1/4)# ip address 220.127.116.11/24
HP9300(config)# ip telnet source-interface ethernet 1/4
USING THE WEB MANAGEMENT INTERFACE
You cannot configure a single Telnet source using the Web management interface.
Specifying a Simple Network Time Protocol (SNTP) Server
You can configure switches and routing switches to consult SNTP servers for the current system time and date.
NOTE: HP switches and routing switches do not retain time and date information across power cycles. Unless
you want to reconfigure the system time counter each time the system is reset, Hewlett-Packard recommends that
you use the SNTP feature.
USING THE CLI
To identify an SNTP server with IP address 18.104.22.168 to act as the clock reference for a switch or routing switch,
enter the following:
HP9300(config)# sntp server 22.214.171.124
Syntax: sntp server <ip-addr> | <hostname> [<version>]
The <version> parameter specifies the SNTP version the server is running and can be from 1 – 4. The default
is 1. You can configure up to three SNTP servers by entering three separate sntp server commands.
By default, the switch or routing switch polls its SNTP server every 30 minutes (1800 seconds). To configure the
switch or routing switch to poll for clock updates from a SNTP server every 15 minutes, enter the following:
HP9300(config)# sntp poll-interval 900
Syntax: [no] sntp poll-interval <1-65535>
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