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5-5
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 5 Checking Port Status and Connectivity
Using Telnet
Guidelines
The following guidelines apply to the use of TDR:
• If you connect a port undergoing a TDR test to an Auto-MDIX enabled port, the TDR result might
be invalid. On certain linecards such as WS-X4148-RJ45V, Auto-MDIX is always enabled. In those
instances, the port on the WS-X4148-RJ45V should be administratively down before the start of the
TDR test.
• If you connect a port undergoing a TDR test to a 100BASE-T port such as that on the
WS-X4148-RJ45V, the unused pairs (4-5 and 7-8) will be reported as faulty because the remote end
does not terminate these pairs.
• Do not change the port configuration while the TDR test is running.
• Due to cable characteristics, you should run the TDR test multiple times to get accurate results.
• Do not change port status (i.e. remove the cable at the near or far end), as this might make the results
inaccurate.
Using Telnet
You can access the switch command-line interface (CLI) using Telnet. In addition, you can use Telnet
from the switch to access other devices in the network. You can have up to eight simultaneous Telnet
sessions.
Before you can open a Telnet session to the switch, you must first set the IP address (and in some cases
the default gateway) for the switch. For information about setting the IP address and default gateway,
see Chapter 3, “Configuring the Switch for the First Time.”
Note To establish a Telnet connection to a host by using the hostname, configure and enable DNS.
To establish a Telnet connection to another device on the network from the switch, perform this task:
This example shows how to establish a Telnet connection from the switch to the remote host named
labsparc:
Switch# telnet labsparc
Trying 172.16.10.3...
Connected to labsparc.
Escape character is '^]'.
UNIX(r) System V Release 4.0 (labsparc)
login:
Command Purpose
Switch# telnet
host
[
port
]
Opens a Telnet session to a remote host.