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-:lastproofread: 2026-03-13
-
-.. _vpp_config_interfaces_loopback:
-
-.. include:: /_include/need_improvement.txt
-
-####################################
-VPP Loopback Interface Configuration
-####################################
-
-VPP loopback interfaces provide virtual interfaces that remain
-administratively up and are commonly used for stable addressing,
-routing protocols, and as Bridge Virtual Interfaces (BVI). Loopback
-interfaces in VPP offer high-performance virtual connectivity with optimized
-packet processing.
-
-Basic Configuration
--------------------
-
-Creating a Loopback Interface
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN>
-
-   Create a loopback interface where ``<vpploN>`` follows the naming
-   convention ``vpplo1``, ``vpplo2``, etc.
-
-**Basic Example:**
-
-.. code-block:: none
-
-   set interfaces vpp loopback vpplo1
-
-Interface Configuration
------------------------
-
-Description and Administrative Control
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> description <description>
-
-   Set a descriptive name for the loopback interface.
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> disable
-
-   Administratively disable the loopback interface.
-
-Kernel Interface Integration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Kernel interface is bounded to the VPP loopback interface for management
-and application compatibility.
-
-IP Address Configuration
-------------------------
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> address <ip-address/prefix>
-
-   Configure IPv4 or IPv6 addresses on the kernel interface. Multiple
-   addresses can be assigned.
-
-**Examples:**
-
-.. code-block:: none
-
-   # IPv4 address
-   set interfaces vpp loopback vpplo1 address 192.168.1.10/24
-
-   # IPv6 address
-   set interfaces vpp loopback vpplo1 address 2001:db8::10/64
-
-MTU Configuration
------------------
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> mtu <size>
-
-   Set the Maximum Transmission Unit (MTU) for the kernel interface.
-   The MTU must be compatible with the connected VPP interface.
-
-VLAN Configuration
-------------------
-
-VPP kernel interfaces support VLAN (Virtual LAN) sub-interfaces for network
-segmentation.
-
-Creating VLAN Sub-interfaces
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> vif <vlan-id>
-
-   Create a VLAN sub-interface with the specified VLAN ID (0-4094).
-
-VLAN Sub-interface Configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-VLAN sub-interfaces support the same configuration options as the parent
-interface:
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> vif <vlan-id> address
-   <ip-address/prefix>
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> vif <vlan-id> description
-   <description>
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> vif <vlan-id> disable
-
-.. cfgcmd:: set interfaces vpp loopback <vpploN> vif <vlan-id> mtu <size>
-
-**Examples:**
-
-.. code-block:: none
-
-   # Configure VLAN 100
-   set interfaces vpp loopback vpplo1 vif 100 address 192.168.100.1/24
-   set interfaces vpp loopback vpplo1 vif 100 description "Management VLAN"
-   set interfaces vpp loopback vpplo1 vif 100 mtu 1500
-
-   # Configure VLAN 200
-   set interfaces vpp loopback vpplo1 vif 200 address 192.168.200.1/24
-   set interfaces vpp loopback vpplo1 vif 200 description "Guest VLAN"
-
-Configuration Examples
-----------------------
-
-Basic Loopback Interface
-^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. code-block:: none
-
-   # Create simple loopback
-   set interfaces vpp loopback vpplo1
-   set interfaces vpp loopback vpplo1 description "Router ID interface"
-
-Loopback with Kernel Interface
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. code-block:: none
-
-   # Loopback with management access
-   set interfaces vpp loopback vpplo2
-   set interfaces vpp loopback vpplo2 description "Management loopback"
-   set interfaces vpp loopback vpplo2 address 10.255.255.1/32
-
-Bridge Virtual Interface (BVI)
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-.. code-block:: none
-
-   # Loopback as BVI for bridge
-   set interfaces vpp loopback vpplo3
-   set interfaces vpp loopback vpplo3 description "Bridge gateway interface"
-   set interfaces vpp bridge vppbr1
-   set interfaces vpp bridge vppbr1 member interface vpplo3 bvi
-   set interfaces vpp loopback vpplo3 address 192.168.100.1/24