LAN Switch Configuration 187
Table 4-17 summarizes some of the key differences between the router IOS CLI and the 1900
IOS CLI:
Basic VLAN Configuration
This section discusses the guidelines for configuring VLANs on the Cisco 1900 switch. You
should remember several items before you begin VLAN configuration:
·
The maximum number of VLANs is switch-dependent. The Catalyst 1900 supports 64
VLANs with a separate Spanning Tree per VLAN.
·
VLAN1 is one of the factory-default VLANs.
·
CDP and VTP advertisements are sent on VLAN1.
·
Catalyst 1900 IP address is in the VLAN1 broadcast domain.
·
The switch must be in VTP server mode to create, add, or delete VLANs.
One term not covered yet in this list is VLAN Trunking Protocol (VTP). VTP is a Layer 2
messaging protocol that maintains VLAN configuration consistency throughout a common
administration domain. VTP accomplishes this goal by managing the additions, deletions, and
name changes of VLANs across networks. VTP minimizes misconfigurations and configuration
inconsistencies that can cause problems, such as duplicate VLAN names or incorrect VLAN-
type specifications.
VTP will be covered in the next section of this chapter; to configure the VLAN features in this
section, the switches will need to be configured in VTP transparent mode.
Table 4-17
IOS CLI Differences: Router Versus 1900 Switch
Function
Router Command, Features
Switch Command, Features
Finding software version
show version command; shows
IOS version
show version command; shows
switch software version
Copying configuration
files to TFTP server
copy startup-config tftp
command; router IOS prompts for
TFTP parameters
copy nvram tftp//server/file
command; switch IOS CLI does not
prompt for TFTP parameters
Updating the config file
used at reload time
copy running-config startup-
config command
Changes to running configuration
using config mode are automatically
reflected in NVRAM config file
Erasing the config file
used at reload time
write erase or erase startup-
config command
delete nvram command
ch04.fm Page 187 Monday, March 20, 2000 5:02 PM