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Switchport trunk allowed vlan add command reference. clear vtp counters Syntax .
- Switchport trunk allowed vlan add command reference. After commande there is no this command in config, and when I look at port with sh int x/x trunk, also nothing changed A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. This article uses a switch running Dell SONiC 4. Commaseparated and hyphenated VLAN number ranges are supported. This Mar 31, 2025 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . All VLAN IDs, 1 to 4094, are allowed on each trunk. The default mode for Layer 2 interfaces is switchport mode dynamic auto . To prevent the packets from specified VLANs passing through the hybrid port use the no form of the command. Use the no form of the command to return to the default. VLANs can be assigned only to a non-routed (layer 2) interface or LAG interface. When the last VLAN is removed from a trunk interface, the interface continues to operate in trunk mode, and will trunk all the VLANs currently defined on the switch, and any new VLANs defined in the future. ***/ On the same port, no two mapping (translation) configurations can have the same outer (or original) or translated VLAN. SW3(config)#int fa0/19 SW3(config-if)#switchport trunk allowed vlan 2 Here’s the trunk information for SW3 after the changes. All ports in the same trunk must be in the same VDC, and trunk ports cannot carry VLANs from different VDCs. For example: Int po 101 switchport vlan mapping enable switchport vlan mapping 101 10 switchport trunk allowed vlan 10 int eth 1/8 /***No configuration***/ Trunking Overview A trunk is a point-to-point link between one or more Ethernet interfaces and another networking device such as a router or a controller. Procedure Jul 29, 2011 · Configuring Access and Trunk Interfaces Ethernet interfaces can be configured either as access ports or trunk ports. The switchport trunk allowed vlan command can be used to customize the list of VLANs that a trunk interface belongs to. Jan 25, 2016 · ^ % Invalid command at '^' marker. clear vtp counters Syntax Oct 14, 2020 · The "add" keyword should only be used when you already have assigned vlans to that interface and now you want to add some more. e. Better way is to add VLAN with below command which will just add the new VLAN into trunk port and keep all the old one’s. Oct 6, 2020 · Hi Sergiu, from your response, I understand that only those VLANs matched by "allowed vlan" on both VPC Peers will allowed on that port-channel/vpc, and there's no impact on other VLANs on that port-channel/vpc due to "switchport trunk allowed vlan add" command - correct? Does it matter on which VPC Peer I make the change first? (You make first change on "operational secondary" VPC Peer first Dec 8, 2023 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . 1Q encapsulation (tagging) method that uses a tag that is inserted into the frame header. Dec 30, 2013 · The switchport trunk allowed vlan command only affects data traffic in individual VLANs but it has no impact on the operation of VTP protocol. To enable trunking to a device that does not support DTP, use the switchport The default mode for Layer 2 interfaces is switchport mode dynamic auto . If there are no vlans to begin with then you use this command; switchport trunk allowed vlan 10,31,33,50,100 now if you want to add say vlan 200 to this list you use the add keyword switchport trunk allowed vlan add 200 HTH Oct 5, 2023 · The switchport vlan mapping enable command enables or disables VLAN-mapping lookup in the hardware regardless of whether the mapping is configured by the global VLAN mapping command or the switchport VLAN mapping command. With VTP version 1 or 2, extended-range VLAN configurations are not stored in the VLAN database, but because VTP mode is transparent, they are stored in the device running configuration file, and you can save the configuration in the startup configuration file. Your config should look the same after "switchport trunk allowed vlan remove 30" as it would after "switchport trunk allowed vlan 10,20,40,50", and the "switchport trunk vlan add 50 Apr 17, 2014 · To add to this, if you had two switches on either side that were trunking VLAN 40 towards this switch, this switch would NOT pass VLAN 40 data from one side to the other because it is not active (not in the VLAN database) as is evident in the third and fourth section. Procedure A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. clear vtp counters Syntax Definitely use 'add' when adding VLANs to a trunk with the 'switchport trunk allowed vlan' command. SUMMARY STEPS 1. VTP pruning must be enabled for this procedure to take effect. Figure 1. so after configuring trunk switchports and creating the VLANs on the server switch, configuring the same domain on the rest of the switches and verify they have the VLANs listed, I tried to issue switchport trunk allowed vlan command on the server switch's interfaces, then tried to verify it with show interface x/x switchport command - I still see 'Trunking VLANs Enabled: ALL' Jun 26, 2014 · Switch (config)# interface gigabitethernet1/0/2 Switch (config-if)# switchport trunk allowed vlan add 1,2,5,6 This example shows how to remove VLANs 3 and 10 to 15 from the pruning-eligible list: A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. switchport trunk allowed vlan This command is used to configure the VLANs available on the trunk (when the interface is in trunking mode). Notice the ‘Port Vlans allowed on trunk for fa0/19’ section. Dec 11, 2024 · show vtp switchport mode private-vlan switchport priority extend switchport trunk vlan vlan dot1q tag native vtp (global configuration) vtp (interface configuration) vtp primary clear vtp counters To clear the VLAN Trunking Protocol (VTP) and pruning counters, use the clear vtp counters command in privileged EXEC mode. Procedure Jun 27, 2023 · Solved: Hello, I've acquired a new Cisco CBS 220 24P 4X and I've an issue to add VLAN into trunk interfaces. Procedure Sep 29, 2023 · This article explains how to create a VLAN and assign it to Trunk and Access switchports. May 31, 2021 · To add or remove the VLANs to or from a general port and configure whether packets on the egress are tagged or untagged, use the switchport general allowed vlan Interface Configuration mode command. Just add "switchport trunk allowed vlan add (vlan tag)" under the port-channel interface. To correctly deliver the traffic on a trunk port with several VLANs, the device uses the IEEE 802. 1. Jul 31, 2025 · The following sections provide information about VLAN Trunks: Information About VLAN Trunks Prerequisites for VLAN Trunks Restrictions for VLAN Trunks How to Configure VLAN Trunks Trunking Overview Trunking Modes Layer 2 Interface Modes Allowed VLANs on a Trunk Load Sharing on Trunk Ports Feature Interactions Information About VLAN Trunks The following sections provide information about VLAN A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. May 24, 2013 · Switchport trunk allowed vlan add 1,2,3 The trunk will then be configured to cater for the additional vlans without removing the vlans, and results in 0 downtime. May 19, 2017 · How to Configure VLAN Trunks To avoid trunking misconfigurations, configure interfaces connected to devices that do not support DTP to not forward DTP frames, that is, to turn off DTP. Syntax Parameters Default Command Mode Usage Information switchport trunk allowed vlan vlan-id-list vlan-id-list - Enter the VLAN numbers of the tagged traffic that the L2 trunk port can carry. May 11, 2016 · 05-11-2016 02:06 PM Hello The command to add an additional vlan to and existing single or aggregate port-channel pruned trunk the command would be: switchport trunk allowed vlan add x Note:- For port-channel you apply the above to the port-channel interface -NOT the physical interfaces for the aggregate res Paul show vtp switchport mode private-vlan switchport priority extend switchport trunk vlan vlan dot1q tag native vtp (global configuration) vtp (interface configuration) vtp primary clear vtp counters To clear the VLAN Trunking Protocol (VTP) and pruning counters, use the clear vtp counters command in privileged EXEC mode. Aug 24, 2025 · An interface with one or more VLAN subinterfaces is automatically configured as an 802. clear vtp counters Syntax Dec 8, 2023 · Information About VLAN Trunks Prerequisites for VLAN Trunks Restrictions for VLAN Trunks How to Configure VLAN Trunks Feature History for VLAN Tunks Information About VLAN Trunks The following sections provide information about VLAN Trunks: Trunking Overview Trunking Modes Layer 2 Interface Modes Allowed VLANs on a Trunk Load Sharing on Trunk Ports Feature Interactions Trunking Overview A Switch(config-if)#switchport trunk allowed vlan add vlan-id, vlan-id,vlan-id To remove one or more VLANs from the trunk, you replace the add parameter with remove. An L2 trunk port has no tagged VLAN membership and does not transmit tagged traffic. Whatever appears in the switchport trunk allowed vlan add command will appear here. Each trunk port has its own eligibility list. I ALWAYS do. Trunks carry the traffic of multiple VLANs over a single link and allow you to extend VLANs across the network. Procedure. My understanding is that for multiple vlan, i need to set the port's switchport to trunk. 10 vs 100 or 1000). Trunking Overview A trunk is a point-to-point link between one or more Ethernet interfaces and another networking device such as a router or a controller. clear vtp counters Syntax A trunk is a point-to-point link between the device and another networking device. If want I to remove vlan 30 from the allowed vlan, should I go under the switch-profile mode and remove vlan 30 from the allowed list even though the switch-profile configuration seems to be missing this. Trunks carry the traffic of multiple VLANs over a single link and allow you to extend VLANs across an entire network. By default, the native (untagged) VLAN for a trunk interface is the default interface (VLAN 1). clear vtp counters Syntax May 22, 2017 · To set the list of allowed VLANs on the trunking interface, use the switchport trunk allowed vlan command. Foe example, these commands configure Ethernet interface 8 as a trunk port: Mar 27, 2013 · Here I just configured the port as dot1q trunk, no other additional command , is the switchport trunk allowed vlan needed in this interface configuration ? You can if you want to. You cannot trunk a VLAN through a switch that isn't aware of that VLAN. Nov 10, 2024 · Ensure Trunk Configuration: Verify that both switches have the trunk configured on the same port Gi0/52 and that the switchport trunk encapsulation dot1q command is supported and used on both sides. Verifying a DME Configuration The following table contains the distinguished name (DN Jun 27, 2022 · Re-write all the VLANs in the command “switchport trunk allowed vlan vlan-id, vlan-id,vlan-id “ including the new VLAN and paste it on the interface. May 14, 2007 · What is is purpose of "switchport trunk allowed vlan all" command? If the port was set to "switchport mode trunk", is it still necessary to use "switchport trunk allowed vlan all" in order to allow all vlans? Thanks, A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. For whatever reason Cisco chose to only allow so many characters to be displayed in the configuration per line for this command - I'm not sure what the number is and it might differ depending on the number of digits in the VLAN tag (i. The VTP still advertises all VLANs, regardless of which VLANs are allowed on a trunk. configure terminal 3. Because VLANs allow you to keep traffic separate on a given physical interface, you can increase the number of interfaces available to your network without adding additional physical interfaces or ASAs. clear vtp counters Syntax Trunking Overview A trunk is a point-to-point link between one or more Ethernet interfaces and another networking device such as a router or a controller. To disable the trunk interface, use the command shutdown. You can do switchport trunk remove command or quickly do: switchport trunk allowed vlan 52 switchport trunk allowed vlan add 160,176,177,247 Then you'll have only those vlans on your interface trunk. Procedure Trunking Overview A trunk is a point-to-point link between one or more Ethernet interfaces and another networking device such as a router or a controller. switchport trunk pruning vlan {add | except | none | remove} vlan-list Dec 7, 2021 · show vtp switchport mode private-vlan switchport priority extend switchport trunk vlan vlan dot1q tag native vtp (global configuration) vtp (interface configuration) vtp primary clear vtp counters To clear the VLAN Trunking Protocol (VTP) and pruning counters, use the clear vtp counters command in privileged EXEC mode. It's not possible to change allowed Vlans on both en The default mode for Layer 2 interfaces is switchport mode dynamic auto . The problem is that from a prior configuration on the port, I seem to have both switchport access and switchport trunk set (not to mention no switchport as I try to fiddle with the settings). When a Layer 2 interface on a Cisco IOS device is configured to operate in trunk mode, the default setting is for the interface to carry all of the VLANs defined on the switch. If you do not intend to trunk across those links, use the switchport mode access interface configuration command to disable trunking. To allow the packets from specified VLANs to pass through the trunk port, use the switchport trunk command in the interface configuration mode. When VTP detects a newly enabled VLAN and the VLAN is in the allowed list for a trunk port, the trunk port automatically becomes a member of the enabled VLAN. configure terminal 2. The switchport trunk allowed vlan command is used to specify the list of VLANs that are allowed on a trunk port. 1Q trunk. Dec 8, 2023 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . Jul 5, 2023 · Solved: Hi all, I want to add some allowed vlan (3400,3410,3420) in uplink port on switch WS-C2960X-24PS-L and use this command ##switchport trunk allowed vlan add 3400,3410,3420 Why it comes with this: interface GigabitEthernet1/0/24 switchport This article shows the commands used for configuration and verification of VLANs that are allowed on a trunk port. To verify the allowed VLAN list for the trunk, issue the show trunk mod_num/port_num command. Oct 8, 2013 · Related Concepts Allowed VLANs on a Trunk Changing the Pruning-Eligible List (CLI) The pruning-eligible list applies only to trunk ports. The following figure shows how you can use trunk ports in the network. Jul 28, 2023 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . Apr 5, 2024 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . I have some trunks configured to some Configuring VLANs - Enable and configure NX-API REST on Cisco Nexus 3000 and 9000 Series switches for network programmability. Jan 9, 2014 · There are 2 aspects to this discussion: 1) what is the action of two configuration commands switchport trunk allowed vlan and switchport trunk allowed vlan add 2) the appearance of entries shown in the running config. N7K2 (config-if)# switchport ? host Set port host Is the problem that I already have an "add" command in the existing config? And if so, do I need to do a "no switchport trunk allowed vlan add 600,605,666,1112" first and then re-enter the command but add the new vlans? To configure the port as a Layer 2 port using the CLI, use the switchport command. Mar 31, 2025 · show vtp switchport mode private-vlan switchport priority extend switchport trunk vlan vlan dot1q tag native vtp (global configuration) vtp (interface configuration) vtp primary clear vtp counters To clear the VLAN Trunking Protocol (VTP) and pruning counters, use the clear vtp counters command in privileged EXEC mode. Aug 14, 2024 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . clear vtp counters Syntax Dec 10, 2014 · I've never seen a "switchport trunk allowed vlan remove X" line in a Cisco config ever - the effect of such a configuration command would be that vlan X would not show up in that interface's config anymore. The same vlan changes will be added automatically to all physical interfaces that are part of the port channel. Personally, I do. A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. Dec 11, 2024 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . switchport trunk pruning vlan {add | except | none | remove} vlan-list [,vlan [,vlan A trunk port can become a member of a VLAN if the VLAN is enabled, if VTP knows of the VLAN, and if the VLAN is in the allowed list for the port. Procedure To restrict the traffic a trunk carries, use the switchport trunk allowed vlan remove vlan-list interface configuration command to remove specific VLANs from the allowed list. Ethernet trunks carry the traffic of multiple VLANs over a single link, and you can extend the VLANs across an entire network. Procedure If a Native VLAN is set to be a non-default # (lets say VLAN 150), and you want to only allow VLAN 10/15/20 over the trunk links, do you also need to include the NATIVE Vlan in your command "switchport trunk allowed vlan 10,15,20" or will it be implied that its the native VLAN so that traffic is inherently allowed? Aug 14, 2024 · The default mode for Layer 2 interfaces is switchport mode dynamic auto . interface interface-id 3. interface interface-id 4. The trunk port carries traffic for two or more VLANs. To allow all VLANs on the trunking interface, use the no form of this command. Dec 5, 2012 · From above it seems the switch-profile configuration is missing the 'switchport trunk allowed vlan' in the port-channel interface. 3 (3). These VLAN IDs define which VLAN traffic is allowed across the trunk interface. Sep 26, 2025 · Use the switchport trunk allowed vlan Interface Configuration mode command to add/remove VLAN (s) to/from a trunk port. Procedure Sep 24, 2014 · switchport trunk allowed vlan 11-12,111 /***Not valid because 11 is outer VLAN and 12 is inner VLAN. The no form of this command removes one or more VLAN IDs from a trunk interface. Apr 23, 2025 · switchport vlan mapping 101 102 switchport vlan mapping 102 103/ When adding a member to an existing port channel using the force command, the "mapping enable" configuration must be consistent. Jun 18, 2009 · To add specific VLANs to the allowed VLANs list for a trunk, issue the set trunk mod_num/port_num vlans command. interface ethernet 1/1 switchport trunk native vlan 60 Note: The property information for this example was added in Release 9. VLAN 1 is the default VLAN on all trunk ports in all Cisco switches, and it has previously been a requirement that VLAN 1 Oct 31, 2020 · Hi It's not adding these vlans because they are already part of the trunk since you have ALL. Jul 6, 2014 · Allowed VLANs on a Trunk By default, a trunk port sends traffic to and receives traffic from all VLANs. Aug 14, 2024 · show vtp switchport mode private-vlan switchport priority extend switchport trunk vlan vlan dot1q tag native vtp (global configuration) vtp (interface configuration) vtp primary clear vtp counters To clear the VLAN Trunking Protocol (VTP) and pruning counters, use the clear vtp counters command in privileged EXEC mode. However, you can remove VLANs from the allowed list, preventing traffic from those VLANs from passing over the trunk. Jul 29, 2019 · Is there a command that I can use on a range of (which is to say, all) ports on the switch which will add the VLAN without otherwise changing the VLAN assignments? In case that’s not clear, let’s say ports: Gi1/0/2 has switchport trunk allowed vlan 1,2,3 Gi1/0/3 has switchport trunk allowed vlan 1,3 Gi1/0/4 has switchport trunk allowed vlan 4 Configures the native VLAN ID for the virtual Ethernet interface. If the neighboring interface supports trunking and is configured to allow trunking, the link is a Layer 2 trunk or, if the interface is in Layer 3 mode, it becomes a Layer 2 trunk when you enter the switchport interface configuration command. Syntax switchport trunk allowed vlan add <vlan id> switchport trunk allowed vlan remove <vlan id> This article describes how you can configure allowed VLANs on trunk on Cisco switches. Switch9E8FD1#conf t Switch9E8FD1 (config)#int gi24 Switch9E8FD1 (config-if)#switchport trunk allowed vlan add 2,3,4,10 Nov 22, 2010 · When changing allowed vlans on a port-channel trunk the switch issues the following message: %EC-SP-5-CANNOT_BUNDLE2: Gi3/13 is not compatible with Po2 and will be suspended (vlan mask is different) The interface and port-channel are then down. Jul 31, 2025 · Information About VLAN Trunks Prerequisites for VLAN Trunks Restrictions for VLAN Trunks How to Configure VLAN Trunks Feature History for VLAN Tunks Information About VLAN Trunks The following sections provide information about VLAN Trunks: Trunking Overview Trunking Modes Layer 2 Interface Modes Allowed VLANs on a Trunk Load Sharing on Trunk Ports Feature Interactions Trunking Overview A Jun 8, 2015 · Related Concepts Allowed VLANs on a Trunk Changing the Pruning-Eligible List (CLI) The pruning-eligible list applies only to trunk ports. enable 2. Allowed vlan on trunk port Hi all! I am a little bit confused about "switchport trunk allowed vlan" and "switchport trunk allowed vlan add" commands so can anyone help me to better understand what is difference between these two commands. May 7, 2008 · I have trunk port between two swithes, bot are in same vtp domain, and I cannot put switchport trunk allowed vlan command on port. Mar 31, 2025 · The extended-range VLAN IDs are allowed for any switchport commands that allow VLAN IDs. Apr 5, 2024 · Information About VLAN Trunks Prerequisites for VLAN Trunks Restrictions for VLAN Trunks How to Configure VLAN Trunks Feature History for VLAN Tunks Information About VLAN Trunks The following sections provide information about VLAN Trunks: Trunking Overview Trunking Modes Layer 2 Interface Modes Allowed VLANs on a Trunk Load Sharing on Trunk Ports Feature Interactions Trunking Overview A Apr 25, 2018 · Syntax Switch (config-if)#switchport trunk allowed vlan <vlan #> Example In this example, allowed VLAN is set for int fa0/19 on SW3. CLI Command The CLI command below is the equivalent to the payload example displayed in the pane on the right. Oct 11, 2014 · Here is a list of basic CLI commands which will help you manage your Dell PowerConnect series switches… Show /// Port VLAN details > show interfaces switchport gigabitethernet 1/0/1 /// Port channel VLAN details > show interfaces switchport port-channel 1 /// Port configuration > show interfaces configuration gigabitethernet 1/0/1 /// Port channel configuration > show interfaces VLANs allowed on trunk - this shows the actual configuration that has been applied as far as allowed VLAN s go. af g9 7dqlqph djbb a774 hrcn epk sl7nnq 66yx fgsu