{"id":24195,"date":"2026-10-31T15:51:17","date_gmt":"2026-10-31T07:51:17","guid":{"rendered":"https:\/\/cciedump.spoto.net\/blog\/?p=24195"},"modified":"2026-10-31T15:51:19","modified_gmt":"2026-10-31T07:51:19","slug":"how-to-default-a-port-on-cisco-switch","status":"publish","type":"post","link":"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html","title":{"rendered":"How to Default a Port on Cisco Switch"},"content":{"rendered":"<p>When reallocating switch ports for new workloads, moving patch cables, or troubleshooting misconfigured services, network administrators frequently need to wipe existing port parameters. Manually typing <code>no<\/code> in front of dozens of commands\u2014such as VLAN assignments, trunk encapsulations, spanning-tree port types, and QoS policies\u2014is tedious and prone to human error.<\/p>\n<p>Cisco networking operating systems provide built-in commands to purge non-default configurations instantly. Whether you are managing traditional Cisco IOS\/IOS-XE Catalyst switches or data center Nexus platforms running NX-OS, this guide details the exact syntax, operational impacts, multi-port procedures, and automation templates required to reset switch ports to factory defaults safely.<\/p>\n<hr>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Cisco_IOSIOS-XE_Command_Reference_default_interface\" title=\"Cisco IOS\/IOS-XE Command Reference: default interface\">Cisco IOS\/IOS-XE Command Reference: default interface<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Syntax\" title=\"Syntax\">Syntax<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Command_Mode\" title=\"Command Mode\">Command Mode<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Parameters_and_Arguments\" title=\"Parameters and Arguments\">Parameters and Arguments<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Supported_Platforms_and_Software_Versions\" title=\"Supported Platforms and Software Versions\">Supported Platforms and Software Versions<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Usage_Guidelines\" title=\"Usage Guidelines\">Usage Guidelines<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#How_to_Default_a_Single_Switch_Port_in_Cisco_IOSIOS-XE\" title=\"How to Default a Single Switch Port in Cisco IOS\/IOS-XE\">How to Default a Single Switch Port in Cisco IOS\/IOS-XE<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_1_Connect_and_Enter_Privileged_EXEC_Mode\" title=\"Step 1: Connect and Enter Privileged EXEC Mode\">Step 1: Connect and Enter Privileged EXEC Mode<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_2_Inspect_the_Current_Interface_Configuration\" title=\"Step 2: Inspect the Current Interface Configuration\">Step 2: Inspect the Current Interface Configuration<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_3_Enter_Global_Configuration_Mode\" title=\"Step 3: Enter Global Configuration Mode\">Step 3: Enter Global Configuration Mode<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_4_Execute_the_default_interface_Command\" title=\"Step 4: Execute the default interface Command\">Step 4: Execute the default interface Command<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_5_Verify_the_Port_Status\" title=\"Step 5: Verify the Port Status\">Step 5: Verify the Port Status<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step_6_Administratively_Secure_the_Port_and_Save_Configuration\" title=\"Step 6: Administratively Secure the Port and Save Configuration\">Step 6: Administratively Secure the Port and Save Configuration<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#How_to_Default_a_Range_of_Switch_Ports_Simultaneously\" title=\"How to Default a Range of Switch Ports Simultaneously\">How to Default a Range of Switch Ports Simultaneously<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Resetting_a_Contiguous_Range_of_Ports\" title=\"Resetting a Contiguous Range of Ports\">Resetting a Contiguous Range of Ports<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Resetting_Non-Contiguous_Disjointed_Ports\" title=\"Resetting Non-Contiguous (Disjointed) Ports\">Resetting Non-Contiguous (Disjointed) Ports<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Execution_Verification\" title=\"Execution Verification\">Execution Verification<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Understanding_What_the_default_interface_Command_Does_FAQ\" title=\"Understanding What the default interface Command Does (FAQ)\">Understanding What the default interface Command Does (FAQ)<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#What_configuration_settings_are_wiped_when_an_interface_is_defaulted\" title=\"What configuration settings are wiped when an interface is defaulted?\">What configuration settings are wiped when an interface is defaulted?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Does_defaulting_a_switch_port_shut_it_down\" title=\"Does defaulting a switch port shut it down?\">Does defaulting a switch port shut it down?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#What_VLAN_does_a_defaulted_port_belong_to\" title=\"What VLAN does a defaulted port belong to?\">What VLAN does a defaulted port belong to?<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Can_I_undo_a_default_interface_command\" title=\"Can I undo a default interface command?\">Can I undo a default interface command?<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Resetting_Switch_Ports_in_Cisco_Nexus_NX-OS\" title=\"Resetting Switch Ports in Cisco Nexus NX-OS\">Resetting Switch Ports in Cisco Nexus NX-OS<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Syntax_Variations_in_NX-OS\" title=\"Syntax Variations in NX-OS\">Syntax Variations in NX-OS<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Step-by-Step_NX-OS_Interface_Defaulting_Guide\" title=\"Step-by-Step NX-OS Interface Defaulting Guide\">Step-by-Step NX-OS Interface Defaulting Guide<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Automating_Switch_Port_Resets_with_Python_and_Ansible\" title=\"Automating Switch Port Resets with Python and Ansible\">Automating Switch Port Resets with Python and Ansible<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Python_Template_Netmiko\" title=\"Python Template (Netmiko)\">Python Template (Netmiko)<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Ansible_Playbook_Template\" title=\"Ansible Playbook Template\">Ansible Playbook Template<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Cisco_IOSIOS-XE_Command_Reference_default_interface\"><\/span>Cisco IOS\/IOS-XE Command Reference: <code>default interface<\/code><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Syntax\"><\/span>Syntax<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<pre><code class=\"language-text\">default interface &lt;interface-id&gt;\ndefault interface range &lt;interface-range&gt;\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Command_Mode\"><\/span>Command Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Global Configuration mode (<code>config#<\/code>)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Parameters_and_Arguments\"><\/span>Parameters and Arguments<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong><code>interface-id<\/code><\/strong>: The type and physical identity of the interface (e.g., <code>GigabitEthernet 1\/0\/1<\/code>, <code>FastEthernet 0\/24<\/code>, <code>TenGigabitEthernet 1\/1\/1<\/code>, <code>Port-channel 10<\/code>).<\/li>\n<li><strong><code>range<\/code><\/strong>: A keyword allowing batch execution across multiple sequential or comma-separated interfaces (e.g., <code>GigabitEthernet 1\/0\/1 - 12<\/code>).<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Supported_Platforms_and_Software_Versions\"><\/span>Supported Platforms and Software Versions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The <code>default interface<\/code> command is supported across all modern enterprise Cisco operating systems, including:<br \/>\n* <strong>Cisco IOS Release 12.1(5)T and later<\/strong><br \/>\n* <strong>Cisco IOS 12.2, 15.0, 15.2 Mainline and SE releases<\/strong> (Catalyst 2960, 3560, 3750, 2960-X series)<br \/>\n* <strong>Cisco IOS-XE 16.x and 17.x (Bengaluru, Cupertino, Dublin, etc.)<\/strong> (Catalyst 3650, 3850, Catalyst 9200, 9300, 9400, 9500, 9600 series)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Usage_Guidelines\"><\/span>Usage Guidelines<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>The command immediately erases all user-defined configurations applied under the interface sub-configuration hierarchy.<\/li>\n<li>The command cannot be negated with <code>no default interface<\/code>. Once entered, changes take effect immediately in the active <code>running-config<\/code>.<\/li>\n<li>When applied to virtual interfaces (such as an SVI or port-channel), running <code>default interface<\/code> purges their settings, but it does not delete the logical entity from NVRAM or the active database.<\/li>\n<\/ul>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Default_a_Single_Switch_Port_in_Cisco_IOSIOS-XE\"><\/span>How to Default a Single Switch Port in Cisco IOS\/IOS-XE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Follow this step-by-step workflow to safely restore a single physical port to factory settings on Catalyst switches running Cisco IOS or IOS-XE.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Connect_and_Enter_Privileged_EXEC_Mode\"><\/span>Step 1: Connect and Enter Privileged EXEC Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Access the switch CLI via console, SSH, or Telnet and escalate privileges:<\/p>\n<pre><code class=\"language-text\">Switch&gt; enable\nSwitch#\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Inspect_the_Current_Interface_Configuration\"><\/span>Step 2: Inspect the Current Interface Configuration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Before removing any configuration, display the active settings to confirm you are targeting the correct physical port:<\/p>\n<pre><code class=\"language-text\">Switch# show running-config interface GigabitEthernet 1\/0\/1\nBuilding configuration...\n\nCurrent configuration : 184 bytes\n!\ninterface GigabitEthernet1\/0\/1\n description Workstation-Finance\n switchport access vlan 20\n switchport mode access\n switchport voice vlan 120\n spanning-tree portfast\n spanning-tree bpduguard enable\nend\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Enter_Global_Configuration_Mode\"><\/span>Step 3: Enter Global Configuration Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The <code>default interface<\/code> command must be run from global configuration mode, not from within interface sub-configuration mode:<\/p>\n<pre><code class=\"language-text\">Switch# configure terminal\nEnter configuration commands, one per line.  End with CNTL\/Z.\nSwitch(config)#\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Step_4_Execute_the_default_interface_Command\"><\/span>Step 4: Execute the <code>default interface<\/code> Command<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Issue the command with the exact interface type and number:<\/p>\n<pre><code class=\"language-text\">Switch(config)# default interface GigabitEthernet 1\/0\/1\nInterface GigabitEthernet1\/0\/1 set to default configuration\nSwitch(config)#\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Step_5_Verify_the_Port_Status\"><\/span>Step 5: Verify the Port Status<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Return to privileged EXEC mode (or use the <code>do<\/code> prefix) and confirm that all custom parameters have been removed:<\/p>\n<pre><code class=\"language-text\">Switch(config)# do show running-config interface GigabitEthernet 1\/0\/1\nBuilding configuration...\n\nCurrent configuration : 38 bytes\n!\ninterface GigabitEthernet1\/0\/1\nend\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Step_6_Administratively_Secure_the_Port_and_Save_Configuration\"><\/span>Step 6: Administratively Secure the Port and Save Configuration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As detailed in the operational impact section below, defaulting an IOS switch port leaves it enabled by default. If the port is not being used immediately, apply a shutdown and write the changes to startup NVRAM:<\/p>\n<pre><code class=\"language-text\">Switch(config)# interface GigabitEthernet 1\/0\/1\nSwitch(config-if)# shutdown\nSwitch(config-if)# end\nSwitch# copy running-config startup-config\nDestination filename [startup-config]? [Enter]\nBuilding configuration...\n[OK]\n<\/code><\/pre>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Default_a_Range_of_Switch_Ports_Simultaneously\"><\/span>How to Default a Range of Switch Ports Simultaneously<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When provisioning bulk patch panels, repurposing switch line cards, or reprovisioning an entire edge switch, resetting individual ports one by one is inefficient. You can execute <code>default interface range<\/code> across both contiguous and non-contiguous interfaces in a single command.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Resetting_a_Contiguous_Range_of_Ports\"><\/span>Resetting a Contiguous Range of Ports<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To reset a sequential block of interfaces, combine the <code>default interface range<\/code> command with a hyphen.<\/p>\n<blockquote><p><strong>Syntax Rule:<\/strong> In Cisco IOS\/IOS-XE CLI parsing, you must include a space before and after the hyphen (e.g., <code>1\/0\/1 - 12<\/code>). Omitting the space will result in a syntax parsing error (<code>% Invalid input detected at '^' marker<\/code>).<\/p><\/blockquote>\n<pre><code class=\"language-text\">Switch# configure terminal\nSwitch(config)# default interface range GigabitEthernet 1\/0\/1 - 24\nReset GigabitEthernet1\/0\/1 to default configuration\nReset GigabitEthernet1\/0\/2 to default configuration\n...\nReset GigabitEthernet1\/0\/24 to default configuration\nSwitch(config)#\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Resetting_Non-Contiguous_Disjointed_Ports\"><\/span>Resetting Non-Contiguous (Disjointed) Ports<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To reset multiple interfaces that are not sequential, separate individual interfaces or sub-ranges using commas:<\/p>\n<pre><code class=\"language-text\">Switch(config)# default interface range GigabitEthernet 1\/0\/1 - 4, GigabitEthernet 1\/0\/9, GigabitEthernet 1\/0\/15 - 18\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Execution_Verification\"><\/span>Execution Verification<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can inspect the entire range at once using the <code>show interface status<\/code> command to confirm that the names, duplex modes, and VLANs have reverted across all target interfaces:<\/p>\n<pre><code class=\"language-text\">Switch(config)# do show interface status | include Gi1\/0\/\nGi1\/0\/1                      notconnect   1            auto   auto 10\/100\/1000BaseTX\nGi1\/0\/2                      notconnect   1            auto   auto 10\/100\/1000BaseTX\n...\nGi1\/0\/24                     notconnect   1            auto   auto 10\/100\/1000BaseTX\n<\/code><\/pre>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"Understanding_What_the_default_interface_Command_Does_FAQ\"><\/span>Understanding What the <code>default interface<\/code> Command Does (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_configuration_settings_are_wiped_when_an_interface_is_defaulted\"><\/span>What configuration settings are wiped when an interface is defaulted?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Every user-configured line item under the interface hierarchy is removed. This includes:<br \/>\n* <strong>Interface metadata<\/strong>: Port descriptions and tracking tags.<br \/>\n* <strong>Switchport parameters<\/strong>: Access VLAN, voice VLAN, trunk native VLAN, allowed VLAN lists, trunking encapsulation, and dynamic trunking protocol (DTP) modes.<br \/>\n* <strong>Layer 3 parameters<\/strong>: IP addresses, subnet masks, VRF assignments, helper addresses, routing protocol statements (OSPF\/EIGRP\/BGP), and MTU overrides.<br \/>\n* <strong>Security &amp; Port Control<\/strong>: Port security (MAC limits, sticky MACs), 802.1X\/MAB authentication configurations, storm control thresholds, and DHCP snooping trust.<br \/>\n* <strong>Spanning Tree Protocol<\/strong>: PortFast, BPDU Guard, BPDU Filter, Root Guard, and link-type tuning.<br \/>\n* <strong>QoS and ACLs<\/strong>: Input\/output access lists, service policies, and queue bandwidth allocations.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_defaulting_a_switch_port_shut_it_down\"><\/span>Does defaulting a switch port shut it down?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>No, on standard Cisco IOS and IOS-XE Layer 2 Catalyst switches, defaulting an interface does not leave it shut down.<\/strong><\/p>\n<p>By default, Layer 2 Ethernet switch ports on Catalyst platforms reside in an administratively enabled state (<code>no shutdown<\/code>). If you run <code>default interface<\/code> on a port that was previously disabled with <code>shutdown<\/code>, the command clears the <code>shutdown<\/code> statement, inadvertently bringing the port <strong>up<\/strong>!<br \/>\n* If a host or rogue device is physically plugged in, it will immediately link up in the switch&#8217;s default VLAN.<br \/>\n* Conversely, on Layer 3 routed interfaces, Cisco IOS routers, and Cisco Nexus NX-OS switches, the factory default administrative state is <code>shutdown<\/code>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_VLAN_does_a_defaulted_port_belong_to\"><\/span>What VLAN does a defaulted port belong to?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>On Cisco Catalyst switches, all Layer 2 interfaces default to <strong>VLAN 1<\/strong> as untagged access ports (or dynamic desirable\/auto, depending on older IOS defaults). Defaulting a port that was previously isolated on a restricted DMZ or guest network will immediately drop that port back into the default management VLAN 1.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_I_undo_a_default_interface_command\"><\/span>Can I undo a <code>default interface<\/code> command?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Cisco IOS does not maintain a native &#8220;undo&#8221; buffer for defaulted interfaces. Unless you have configured the Cisco IOS <code>archive<\/code> feature with rollback checkpoints, the previous commands cannot be restored automatically. Always execute a <code>show running-config interface &lt;id&gt;<\/code> or save your running configuration prior to defaulting ports in a production environment.<\/p>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"Resetting_Switch_Ports_in_Cisco_Nexus_NX-OS\"><\/span>Resetting Switch Ports in Cisco Nexus NX-OS<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Data center switches running Cisco NX-OS handle interface defaulting differently than Catalyst switches. NX-OS introduces configuration checkpoints, handles range syntax without strict spacing rules, and maintains an administrative default of <code>shutdown<\/code>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Syntax_Variations_in_NX-OS\"><\/span>Syntax Variations in NX-OS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Contiguous ranges do not require spaces:<\/strong> You can issue <code>interface ethernet 1\/1-10<\/code>.<\/li>\n<li><strong>Built-in Checkpoints:<\/strong> NX-OS allows you to generate a configuration checkpoint simultaneously, providing a safety net if you need to roll back.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Step-by-Step_NX-OS_Interface_Defaulting_Guide\"><\/span>Step-by-Step NX-OS Interface Defaulting Guide<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4>Step 1: Default the Port (with Optional Checkpoint)<\/h4>\n<p>Enter configuration mode and run the <code>default interface<\/code> command. You can pass the optional <code>checkpoint<\/code> keyword followed by an identifier:<\/p>\n<pre><code class=\"language-text\">Nexus-switch# configure terminal\nNexus-switch(config)# default interface ethernet 1\/5 checkpoint port_reset_bak\n.......Done\nNexus-switch(config)#\n<\/code><\/pre>\n<h4>Step 2: Defaulting Ranges on NX-OS<\/h4>\n<p>To default a contiguous block of ports on NX-OS:<\/p>\n<pre><code class=\"language-text\">Nexus-switch(config)# default interface ethernet 1\/10-15\n<\/code><\/pre>\n<p>For non-contiguous ports, specify each interface type explicitly:<\/p>\n<pre><code class=\"language-text\">Nexus-switch(config)# default interface ethernet 1\/20, ethernet 1\/24, ethernet 1\/28\n<\/code><\/pre>\n<h4>Step 3: Re-enable the Port<\/h4>\n<p>Unlike IOS Catalyst switches, NX-OS defaults interfaces to an administrative status of <strong><code>shutdown<\/code><\/strong>. To place the defaulted port into service, navigate to the interface and execute <code>no shutdown<\/code>:<\/p>\n<pre><code class=\"language-text\">Nexus-switch(config)# interface ethernet 1\/5\nNexus-switch(config-if)# no shutdown\nNexus-switch(config-if)# end\n<\/code><\/pre>\n<h4>Step 4: Rollback (If Required)<\/h4>\n<p>If you generated a checkpoint during Step 1 and need to restore the port configuration, execute the rollback command:<\/p>\n<pre><code class=\"language-text\">Nexus-switch# rollback running-config checkpoint port_reset_bak\n<\/code><\/pre>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"Automating_Switch_Port_Resets_with_Python_and_Ansible\"><\/span>Automating Switch Port Resets with Python and Ansible<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For multi-switch deployments or scheduled network maintenance, automated scripts eliminate manual CLI work. Below are turnkey automation templates using Python (Netmiko) and Ansible.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Python_Template_Netmiko\"><\/span>Python Template (Netmiko)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This script authenticates over SSH to a Cisco IOS\/IOS-XE switch, defaults a designated list of individual ports and ranges, enforces an administrative shutdown on them for security, and commits the changes to startup memory.<\/p>\n<pre><code class=\"language-python\">#!\/usr\/bin\/env python3\n\"\"\"\nScript: cisco_port_default.py\nDescription: Connects to a Cisco IOS\/IOS-XE device and defaults specified switchports.\n\"\"\"\n\nfrom netmiko import ConnectHandler\nfrom netmiko.exceptions import NetmikoTimeoutException, NetmikoAuthenticationException\n\n# Device connection parameters\ndevice = {\n    \"device_type\": \"cisco_ios\",\n    \"host\": \"192.168.10.2\",\n    \"username\": \"netadmin\",\n    \"password\": \"SecurePassword123!\",\n    \"secret\": \"EnableSecret123!\",\n}\n\n# Ports or port-ranges to default\ninterfaces_to_default = [\n    \"GigabitEthernet1\/0\/5\",\n    \"GigabitEthernet1\/0\/6\",\n    \"range GigabitEthernet1\/0\/20 - 24\",\n]\n\ndef default_cisco_ports():\n    try:\n        print(f\"Connecting to {device['host']}...\")\n        with ConnectHandler(**device) as conn:\n            conn.enable()\n\n            # Build command list\n            commands = []\n            for target in interfaces_to_default:\n                commands.append(f\"default interface {target}\")\n                # Optional: Force shutdown on defaulted ports for hygiene\n                commands.append(f\"interface {target}\")\n                commands.append(\"shutdown\")\n\n            print(\"Executing default commands...\")\n            output = conn.send_config_set(commands)\n            print(output)\n\n            print(\"Saving running-config to startup-config...\")\n            save_output = conn.save_config()\n            print(save_output)\n            print(\"Port reset completed successfully.\")\n\n    except (NetmikoTimeoutException, NetmikoAuthenticationException) as err:\n        print(f\"Connection failure to {device['host']}: {err}\")\n    except Exception as general_err:\n        print(f\"An unexpected error occurred: {general_err}\")\n\nif __name__ == \"__main__\":\n    default_cisco_ports()\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"Ansible_Playbook_Template\"><\/span>Ansible Playbook Template<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This playbook utilizes the official <code>cisco.ios<\/code> collection to push interface reset commands across an inventory group named <code>[switches]<\/code>.<\/p>\n<pre><code class=\"language-yaml\">---\n- name: Reset Selected Switchports to Factory Default\n  hosts: switches\n  gather_facts: false\n  connection: network_cli\n\n  vars:\n    target_interfaces:\n      - \"GigabitEthernet1\/0\/10\"\n      - \"GigabitEthernet1\/0\/11\"\n      - \"range GigabitEthernet1\/0\/15 - 18\"\n\n  tasks:\n    - name: Reset interface configurations to default\n      cisco.ios.ios_config:\n        lines:\n          - \"default interface {{ item }}\"\n      loop: \"{{ target_interfaces }}\"\n      register: reset_result\n\n    - name: Ensure defaulted ports are placed in shutdown state\n      cisco.ios.ios_config:\n        parents: \"interface {{ item }}\"\n        lines:\n          - \"shutdown\"\n      loop: \"{{ target_interfaces }}\"\n\n    - name: Save configuration changes to NVRAM\n      cisco.ios.ios_config:\n        save_when: modified\n<\/code><\/pre>\n<hr>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The <code>default interface<\/code> command is one of the most effective tools in Cisco CLI management, allowing network engineers to strip legacy, complex configurations from switch ports in a single command. However, leveraging it safely requires recognizing the platform-specific behaviors: Catalyst IOS switches return defaulted ports to an unassigned, enabled state in VLAN 1, while Cisco Nexus switches default ports into a disabled state and allow checkpoint rollback protections.<\/p>\n<p>For best operational practice, always verify current port assignments prior to running resets, administratively shut down newly defaulted ports until they are actively patched, and utilize automation scripts when handling mass decommissioning across enterprise stacks.<\/p>\n<div class='sfsi_Sicons' style='width: 100%; display: inline-block; vertical-align: middle; text-align:left'><div style='margin:0px 8px 0px 0px; line-height: 24px'><span>Please follow and like us:<\/span><\/div><div class='sfsi_socialwpr'><div class='sf_fb_share sf_icon' style='text-align:left;vertical-align: middle;'><a href='https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fcciedump.spoto.net%2Fblog%2Fhow-to-default-a-port-on-cisco-switch_24195.html' style='display:inline-block;'  > <img class='sfsi_wicon'  data-pin-nopin='true' width='auto' height='auto' alt='fb-share-icon' title='Facebook Share' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/visit_icons\/fbshare_bck.png'  \/><\/a><\/div><div class='sf_twiter sf_icon' style='display: inline-block;vertical-align: middle;width: auto;margin-left: 7px;'>\r\n\t\t\t\t\t\t<a target='_blank' href='https:\/\/twitter.com\/intent\/tweet?text=How+to+Default+a+Port+on+Cisco+Switch+https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html'style='display:inline-block' >\r\n\t\t\t\t\t\t\t<img data-pin-nopin= true width='auto' class='sfsi_wicon' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/visit_icons\/en_US_Tweet.svg' alt='Tweet' title='Tweet' >\r\n\t\t\t\t\t\t<\/a>\r\n\t\t\t\t\t<\/div><div class='sf_pinit sf_icon' style='text-align:left;vertical-align: middle;float:left;line-height: 33px;width:auto;margin: 0 -2px;'><a href='#'  onclick='sfsi_pinterest_modal_images(event,\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\",\"How to Default a Port on Cisco Switch\")' style='display:inline-block;'  > <img class='sfsi_wicon'  data-pin-nopin='true' width='auto' height='auto' alt='fb-share-icon' title='Pin Share' src='https:\/\/cciedump.spoto.net\/blog\/wp-content\/plugins\/ultimate-social-media-icons\/images\/share_icons\/Pinterest_Save\/en_US_save.svg'  \/><\/a><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>When reallocating switch ports for new workloads, moving patch cables, or troubleshooting misconfigured services, network administrators frequently need to wipe existing port parameters. Manually typing no in front of dozens of commands\u2014such as VLAN assignments, trunk encapsulations, spanning-tree port types, and QoS policies\u2014is tedious and prone to human error. Cisco networking operating systems provide built-in&#8230; &raquo; <a class=\"read-more-link\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\">read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,608],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Default a Port on Cisco Switch - SPOTO Official Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cciedump.spoto.net\/blog\/how-to-default-a-port-on-cisco-switch_24195.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Default a Port on Cisco Switch - SPOTO Official Blog\" \/>\n<meta property=\"og:description\" content=\"When reallocating switch ports for new workloads, moving patch cables, or troubleshooting misconfigured services, network administrators frequently need to wipe existing port parameters. 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