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6.2 | |
Configuring the Switch | |
| 6.2.1 | |
Verifying the Catalyst switch default configuration |
When powered up for the first time, a
switch has default data in the running configuration file. The default
hostname is Switch. No passwords are set on the console or
virtual terminal (vty) lines.
A switch may be given an IP address for management purposes. This is
configured on the virtual interface, VLAN 1. By default, the switch has
no IP address.
The switch ports or interfaces are set to
auto mode The flash directory by default, has a
file that contains the IOS image, a file called env_vars, and a
sub-directory called html. After configuring the switch, it may contain a config.text file, and a VLAN
database. The flash directory has no VLAN database file, vlan.dat, and
shows no saved configuration file, config.text.
The IOS version and the configuration
register settings can be verified with the
show version command.
In this default state, the switch has one broadcast domain and can be managed or configured through the console port using the CLI. The Spanning-Tree Protocol is also enabled, and allows the bridge to construct a loop-free topology across an extended LAN. For small networks, the default configuration may be sufficient. The benefits of better performance with microsegmentation are obtained immediately.
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,
and all switch ports are in VLAN 1.
VLAN 1 is
known as the default management VLAN. 
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