Configure a Loopback Interface
Table of Contents
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- Add a Branch
- Add a Data Center
- Add a Branch Gateway
- Configure Circuits
- Configure Internet Circuit Underlay Link Aggregation
- Configure Private WAN Underlay Link Quality Aggregation
- Configure Circuit Categories
- Configure Device Initiated Connections for Circuits
- Add Public IP LAN Address to Enterprise Prefixes
- Manage Data Center Clusters
- Configure a Site Prefix
- Configure a DHCP Server
- Configure NTP for Prisma SD-WAN
- Configure the ION Device at a Branch Site
- Configure the ION Device at a Data Center
- Switch a Site to Control Mode
- Allow IP Addresses in Firewall Configuration
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- Configure a Controller Port
- Configure Internet Ports
- Configure WAN/LAN Ports
- Configure a Loopback Interface
- Configure a PoE Port
- Configure and Monitor LLDP Activity and Status
- Configure a PPPoE Interface
- Configure a Layer 3 LAN Interface
- Configure Application Reachability Probes
- Configure a Secondary IP Address
- Configure a Static ARP
- Configure a DHCP Relay
- Configure IP Directed Broadcast
- VPN Keep-Alives
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- Configure Prisma SD-WAN IPFIX
- Configure IPFIX Profiles and Templates
- Configure and Attach a Collector Context to a Device Interface in IPFIX
- Configure and Attach a Filter Context to a Device Interface in IPFIX
- Configure Global and Local IPFIX Prefixes
- Flow Information Elements
- Options Information Elements
- Configure the DNS Service on the Prisma SD-WAN Interface
- Configure SNMP
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- Prisma SD-WAN Branch Routing
- Prisma SD-WAN Data Center Routing
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- Configure Multicast
- Create a WAN Multicast Configuration Profile
- Assign WAN Multicast Configuration Profiles to Branch Sites
- Configure a Multicast Source at a Branch Site
- Configure Global Multicast Parameters
- Configure a Multicast Static Rendezvous Point (RP)
- Learn Rendezvous Points (RPs) Dynamically
- View LAN Statistics for Multicast
- View WAN Statistics for Multicast
- View IGMP Membership
- View the Multicast Route Table
- View Multicast Flow Statistics
- View Routing Statistics
- Prisma SD-WAN Incident Policies
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- Prisma SD-WAN Branch HA Key Concepts
- Configure Branch HA
- Configure HA Groups
- Add ION Devices to HA Groups
- View Device Configuration of HA Groups
- Edit HA Groups and Group Membership
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- Configure Branch HA with Gen-1 Platforms (2000, 3000, 7000, and 9000)
- Configure Branch HA with Gen-2 Platforms (3200, 5200, and 9200)
- Configure Branch HA with Gen-2 Embedded Switch Platforms (1200-S or 3200-L2)
- Configure Branch HA for Devices with Software Cellular Bypass (1200-S-C-5G)
- Configure Branch HA for Platforms without Bypass Pairs
- Prisma SD-WAN Clarity Reports
- Prisma SD-WAN Incidents and Alerts
Configure a Loopback Interface
Let us learn to configure a loopback interface.
Where Can I Use
This? | What Do I
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Loopback is a logical, virtual interface used
to emulate a WAN port to provide LAN functionality. You can free up
a physical port previously used for LAN/WAN configuration by designating
a loopback interface. You can configure a maximum of four loopback
interfaces per device.
ION devices on
versions 4.5.3 or
later
at a site, support loopback interface. A loopback interface
can only be used as a WAN port on interfaces with no hardware bypass
circuitry. Interfaces with no hardware bypass circuitry per device
are as follows:- ION 1000—All ports.
- ION 1200—All ports.
- ION 2000—Ports 1–3.
- ION 7000—Ports 1–4, 9–14.
- Virtual IONs—All non-controller ports.
A loopback
interface may be brought up or down administratively and may not
contain any sub-interfaces or IP configurations.
- You can update or delete a loopback interface. However, you cannot delete if it is part of a bypass pair.
- Decouple a port coupled with another port before a loopback interface can be coupled to create a bypass pair.
- The only valid option in the Use These Ports For drop-down is Private Layer 2 for a bypass pair that is made up of a physical LAN port and a loopback interface as the WAN port.
- The network policy rules assigned to such a site must not have any rules using the Direct on private WAN path. Valid paths are Direct on public or VPN on public. Traffic is dropped if a direct on private path is used.
- Select, select the device you want to configure.WorkflowsDevicesClaimed Devices
- Select theInterfacestab.
- On the interface configuration page for a device, click the+add icon to add a loopback interface and selectAdd.
- ForAdmin Up, selectNoorYesto administratively bring the interface up or down.
- Enter aDescriptionand selectCreate Loopback.The system assigns a default loopback ID to the interface. A confirmation message displays that the loopback interface is successfully created.
- Next, select a port to be configured with a loopback interface.
- ForAdmin Up, selectNoorYesto administratively bring the interface up or down. The default is Yes.
- (Optional)Enter aDescription.
- From theInterface Typedrop-down, selectBypass Pair.
- From thePair Withdrop-down, select the Loopback Interface.A confirmation message displays.
- SelectDoneto create a bypass pair with the loopback interface successfully.A confirmation message displays the port's successful creation and the loopback interface.
- ForUse These Ports For, selectPrivate L2from the drop-down.This is the only valid option for a bypass pair that is made of a physical LAN port and a loopback interface for the WAN port.
- Select theCircuit Labelfrom the drop-down.
- (Optional)If you chooseCopy Settings from Another Port, select the bypass pair to copy the settings. If not, you may leave it blank.
- Similar to configuring bypass pairs, forAttached Networks, enter aVLAN ID,IP Address at Router, optionalNetwork Context, and toggle the scope tpLocalorGlobalscope.
- Save Bypass Pair.The port and the loopback interface are displayed under Interfaces.