2950 and 3550 Switches

You can use the keystrokes Ctrl+Shift+6, then X, as an escape sequence.
2950 and 3550 Switches
You can use the Ping and Traceroute programs, and you can telnet into and out of any of the
switches, as long as a password has been set up:
Terry_2950#ping 172.16.10.10
Sending 5, 100-byte ICMP Echos to 172.16.10.10, time out is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max 0/2/10/ ms
You can omit the word telnet and just enter the host name or IP address of the
target host, if you wish.
Terry_2950#conf t
Terry_2950(config)#ip host jack 172.16.10.10
Terry_2950(config)#^Z
Terry_2950#ping jack
Sending 5, 100-byte ICMP Echos to 172.16.10.10, time out is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max 0/2/10/ms
Physical Troubleshooting
If the ping test doesn’t work, make sure IP addressing and gateways are set up correctly. If they
are, and no other part of the network is having problems, there is a good chance that the problem
has to do with the Physical layer.
Connecting and Logging In to a Switch 439
When testing Physical layer connectivity, it is important to focus the tests on the cabling and
on the interfaces. In those instances when it is possible, test the port on the switch by plugging
in a laptop directly. Plugging the patch cord into a different port can test the cable inside the
wall. Finally, test the NIC by plugging the PC into a different cable run and port.
Saving and Erasing the Switch Configuration
The IOS-based switches hold their configuration in the running-config file. Using the
command copy running-config startup-config copies this file to nonvolatile RAM
(NVRAM), where it is saved as the startup-config file. The 4000 series switches automatically
copy their configuration to NVRAM. You can delete the configurations if you
want to start over.
It is also common to back up the configuration files on a Trivial File Transfer
Protocol (TFTP) server, but despite your best efforts, things will go wrong at
some time in any network. First, make sure that the TFTP server is available
using the ping command. Ensure that access to the server directory is
authorized and then enter the command copy running-config (or copy
startup-config) tftp. A small menu follows, prompting you for the server



486
IP address and filename to be stored. The router indicates a successful (or
unsuccessful) file transfer.