cisco

content/snippets/0260-administring-a-cisco-switch.md

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+<!--
+title: Administring a Cisco Switch
+date: 2025-04-17
+-->
+
+# Administring a Cisco Switch - Basics for the Homelab Usage
+
+## Saving the Configuration
+
+Never forget, otherwise after reboot changes are gone!
+
+```
+write memory
+```
+
+
+## Configure VLANs
+
+Allow VLAN-IDs greater then 1005:
+
+```
+configure terminal
+vtp mode transparent
+exit
+```
+
+
+```
+configure terminal
+vlan 1001
+name vlan1001
+exit
+exit
+```
+
+The first `exit` leaves the interface, the second `exit` leaves the config session.
+
+If the VLAN should be used for management purposes it needs an IP address:
+
+```
+configure terminal
+vlan 2000
+name vlan2000
+ip address dhcp
+exit
+exit
+```
+
+
+Check your work:
+
+```
+show vlan
+```
+
+
+## Configure Interfaces
+
+To check your work use
+
+```
+show interfaces status
+```
+
+
+### Access Ports
+
+```
+configure terminal
+interface GigabitEthernet1/0/1
+switchport mode access
+switchport access vlan 1001
+spanning-tree portfast
+no shutdown
+exit
+exit
+```
+
+### Trunk Ports
+
+```
+configure terminal
+interface GigabitEthernet1/0/23
+switchport mode trunk
+switchport trunk allowed vlan 1012,3001,3002,3003,3004
+switchport trunk native vlan 1012
+no shutdown
+exit
+exit
+```
+
+`allowed` connects the port to the VLAN for tagged communication.
+
+`native` makes the VLAN untagged on that port.
+
+