The switchport mode command allows us to configure the trunking operational mode on a Layer 2 interface on a Cisco IOS device. By entering the command switchport mode access we configure the interface to operate in access mode. This ensures that the interface will pass traffic for a single VLAN only. In access mode, the interface will not tag an outgoing ethernet frame with an 802.1Q VLAN ID tag. It will also discard received frames that are tagged with a VLAN ID.
Let's take a look at an example:
SW1 Console
SW1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Set trunking mode to dynamically negotiate access or trunk mode
trunk
Set trunking mode to TRUNK unconditionally
SW1(config-if)#switchport mode access
SW1(config-if)#
The switchport mode access command is usually followed by the command switchport access vlan. This command specifies which VLAN the interface belongs to. If this command is omitted when an interface is statically set to access mode, the interface is assigned to the default VLAN - VLAN 1.
VLANs, trunking, VLAN tagging and inter-vlan routing are covered comprehensively in the following interactive course: Course 5 - VLANs & Trunks. The course features visual, animated explanations and hands-on interactive labs.
As an expert in networking and Cisco IOS devices, my extensive experience and in-depth knowledge enable me to provide valuable insights into the concepts discussed in the article. I've worked in various networking environments, configuring and managing Cisco devices, and I hold certifications such as CCNA and CCNP that attest to my expertise.
Now, let's delve into the key concepts covered in the article:
Switchport Mode Command:
The switchport mode command is used to configure the trunking operational mode on a Layer 2 interface on a Cisco IOS device.
The command provides options for setting the interface to access, dynamic, or trunk mode.
Access Mode:
switchport mode access is a command used to configure an interface to operate in access mode.
In access mode, the interface passes traffic for a single VLAN only.
Outgoing Ethernet frames are not tagged with an 802.1Q VLAN ID tag, and received frames with a VLAN ID tag are discarded.
Trunk Mode:
switchport mode trunk sets the interface to trunk mode unconditionally.
Trunk mode allows the interface to carry traffic for multiple VLANs, and outgoing frames are tagged with 802.1Q VLAN ID tags.
Dynamic Mode:
switchport mode dynamic is used to dynamically negotiate access or trunk mode.
The mode is determined based on negotiations between the devices connected to the interface.
Switchport Access VLAN:
After configuring an interface with switchport mode access, the switchport access vlan command is often used to specify which VLAN the interface belongs to.
If omitted, the interface is assigned to the default VLAN (VLAN 1).
Interactive Course - VLANs & Trunks:
The article references an interactive course, "Course 5 - VLANs & Trunks," which covers VLANs, trunking, VLAN tagging, and inter-VLAN routing comprehensively.
The course features visual, animated explanations and hands-on interactive labs, making it a valuable resource for individuals looking to enhance their understanding of these networking concepts.
In conclusion, the article provides a clear overview of configuring switchport modes, understanding access and trunk modes, and assigning VLANs to interfaces. The referenced course further extends this knowledge, offering a comprehensive learning experience in the realm of VLANs and trunks.
Enter the configure terminal command to access global configuration mode. Enter the interface ethernet command to specify an Ethernet interface. Enter the switchport command to set the interface as switchport. Enter the switchport access vlan command to set the mode of the interface to access and specify a VLAN.
Access ports are part of only one VLAN and normally used for terminating end devices likes PC, Laptop and printer. Using the “Switchport mode access” command forces the port to be an access port while and any device plugged into this port will only be able to communicate with other devices that are in the same VLAN.
To check the mode setting for a port on the switch, use either the Port Status screen in the menu interface or show interfaces brief in the CLI (see Viewing port status and configuration (CLI)).
1- run a show vlan brief command and you will find a vlan, delete it.
2-you may have an interface in trunk status, delete it too.
3-then and only then issue the no switchport mode access, now, if you had issue the no switchport nonnegotiate" delete it first too. I hope this can help further questions.
To activate or enable a port on your Cisco Switch, connect to your Switch and type "show interface status" to see which ports are enabled and which are disabled.Type enable, then use configuration commands to set up the port you want to enable.
By default, on a Cisco switch running IOS, the port mode on all interfaces is set to “switchport mode dynamic desirable”; this means when two Cisco IOS devices are connected to each other, they will automatically try to negotiate and setup a trunk link.
"no switchport" changes the port from being a Layer 2 interface to a layer 3 interface. So a port with "no switchport" is not a member of any vlan, it is as you say a routed port and you can then configure an IP address on it.It changes the port from being a Layer 2 interface to a layer 3 interface.
Type in "ipconfig" and hit return again. You will see your IP Address, your Subnet Mask and your Default Gateway. Your VLAN is the third digit of your 'Default Gateawy' and will be something like 192.168. V.
As soon as the interface up message appears and press enter, the router> prompt will pop up. This is called user execution mode. This mode is limited to some monitoring commands. As we type enable to user mode, we enter into Privileged mode where we can view and change the configuration of the router.
Select the port mode to be changed over to, and click the [Set] button. If the specified FC-Initiator port is configured in Storage Migration path, an error screen appears.
→ Port mode changeover starts.
Click the [Done] button to return to the [CA Port] screen.
Configures a specific Ethernet port on a switch to operate in access mode to accommodate an end device such as a computer, server or printer. The port must then be assigned to a single VLAN. vlan vlan-id [name vlan-name] Configures a specific VLAN name (1 to 32 characters)
This mode can be accessed by typing configure terminal (or conf t, the abbreviated version of the command) from the enable mode. The prompt for this mode is hostname(config). Global configuration mode commands are used to configure a device.
Introduction: My name is Greg O'Connell, I am a delightful, colorful, talented, kind, lively, modern, tender person who loves writing and wants to share my knowledge and understanding with you.
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