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Chapter 11
Configuring Interface Characteristics
Command
Step 4
end
Step 5
show interfaces interface-id description
or
show running-config
Step 6
copy running-config startup-config
Use the no description interface configuration command to delete the description.
This example shows how to add a description on a port and how to verify the description:
Switch# config terminal
Enter configuration commands, one per line.
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# description Connects to Marketing
Switch(config-if)# end
Switch# show interfaces gigabitethernet1/0/2 description
Interface Status
Gi1/0/2
Configuring Layer 3 Interfaces
The Catalyst 3750 switch supports these types of Layer 3 interfaces:
•
•
•
A Layer 3 switch can have an IP address assigned to each routed port and SVI.
There is no defined limit to the number of SVIs and routed ports that can be configured in a switch stack.
However, the interrelationship between the number of SVIs and routed ports and the number of other
features being configured might have an impact on CPU usage because of hardware limitations. If the
switch is using maximum hardware resources, attempts to create a routed port or SVI have these results:
•
•
78-16180-02
Protocol Description
admin down
down
SVIs: You should configure SVIs for any VLANs for which you want to route traffic. SVIs are
created when you enter a VLAN ID following the interface vlan global configuration command. To
delete an SVI, use the no interface vlan global configuration command.
Note
When you create an SVI, it does not become active until it is associated with a physical port.
For information about assigning Layer 2 ports to VLANs, see
VLANs."
Routed ports: Routed ports are physical ports configured to be in Layer 3 mode by using the no
switchport interface configuration command.
Layer 3 EtherChannel ports: EtherChannel interfaces made up of routed ports.
EtherChannel port interfaces are described in
If you try to create a new routed port, the switch generates a message that there are not enough
resources to convert the interface to a routed port, and the interface remains as a switchport.
If you try to create an extended-range VLAN, an error message is generated, and the extended-range
VLAN is rejected.
Purpose
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entries in the configuration file.
End with CNTL/Z.
Connects to Marketing
Chapter 33, "Configuring EtherChannels."
Catalyst 3750 Switch Software Configuration Guide
Configuring Layer 3 Interfaces
Chapter 13, "Configuring
11-21
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Troubleshooting
