• Routing and Switching

Configure IP Address in JunOS

Are you new to Juniper Networks ? If yes then I am sure you are having hard times configuring IP address in Juniper device’s interface. Today I will show you how to configure IP address in JunOS or Juniper devices. Before showing you the commands in configuring IP address lets begin with some basics.

Well, there are different modes in  JunOS like Cisco IOS. The modes are Operational Mode and Configuration Mode. You can configure IP address in JunOS operating system in Configuration mode only. In JunOS everything you configure for interface is logical. Unlike Cisco IOS, when you configure IP address in a JunOS interface then you are actually creating logical interface and configure IP address in that logical interface. The logical entity is called unit and is given a number starting with zero “0”. Most of the times you will configure IP address in logical unit 0.

JunOS supports many protocols. IPv4 and IPv6 is the protocol ( family ) that you will be using most of the time. JunOS calls inet for IPv4 and inet6 for IPv6. So you have to mention the family inet or inet6 while configuring IP address in Juniper router’s interface.

Let’s see an example of how IP address is configured. We will configure IPv4 address on ge-0/0/0 interface.

Here, IP address is assigned on logical interface ge-0/0/ 0.0 interface of IPv4 family. You can view this information by typing the following command,

Now let’s see another example for configuring IPv6 address in ge-0/0/0 interface.

Here family inet6 is used to specify IPv6 address. To view the configuration you can use the show command.

This command will show you information about this interface in detail.

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Configure Private VLANs in Juniper Switch

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How do I assign IP addresses to each of my VLANs?


Erdem 06-25-2018 08:12


smanju 06-25-2018 11:08 Best Answer

1.  how do i assign ip addresses to each of my vlans.

assign ip to interface juniper

Forgive me, I'm very new to JunOS.  On ArubaOS I was able to assign IP addresses to VLANs like this:

(vlan100)#ip address netmask


(vlan 200)#ip address netmask

And so on.  I'm trying to look for the equivalent way to configure this in JunOS.  I need to assign IP addresses to a couple different VLANs.  How can I accomplish this?  I believe the idea is that I need to assing inet to the unit #, but I'm not sure how a unit # differs from a VLAN on JunOS. 

To be clear, I do not want the switch to do the routing, I want the routing to happen at my firewall on port 23.

Here's my interface config:

2.  RE: How do I assign IP addresses to each of my VLANs? Best Answer

assign ip to interface juniper

A vlan on a juniper switch is its own boadcast domain. It groups all devices into a specific (vlan) group as per the vlan membership of the interface on the switch through which the devices are connected.

Whenever there is a need to split a interface into multiple sub interfaces then the unit # is referenced. A unit number identifies the particular subinterface of the main interface. JunOS supports 4094 logical subinterfaces per main interface. As a general practise it is recomended to use vlan id as the unit number for better clarity and visibility of the configuration/network. 

In your case you can use irb to configure ip address to the vlans on the switch. However the switch does routing for the packets which are have gateway/nexhop as the vlan ip address on the switch. You can still point to the Firewall ip address connected to switch port 23 as the gateway for the hosts in your network so that your routing is performed by the firewall.

Following is an example vlan configuration.

set vlans vlan100 vlan-id 100

set vlans vlan100 l3-interface irb.100

set interfaces irb unit 100 family inet address

set interfaces ge-0/0/5 unit 0 family ethernet-switching vlan members vlan100

set interfaces ge-0/0/23 unit 0 family ethernet-switching interface-mode trunk set interfaces ge-0/0/23 unit 0 family ethernet-switching vlan members vlan100

In the above configuration the traffic from port  ge-0/0/5 will be switched to interface ge-0/0/23 as long as the default gateway for the device connected on port ge-0/0/5 is set to Firewall ip address connected to port ge-0/0/23.

Please refer to the following documentation for further details.





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Management ethernet interface overview, configuring a consistent management ip address, configuring the mac address on the management ethernet interface, management ethernet interfaces.

To connect to the router via the management port, use the management Ethernet interface. This topic provides you an overview of the management Ethernet Interface and describes how to configure the IP address and MAC address for the interface.

The router’s management Ethernet interface, fxp0 or em0 , is an out-of-band management interface that needs to be configured only if you want to connect to the router through the management port on the front of the router. You can configure an IP address and prefix length for this interface, which you commonly do when you first install the Junos OS:

To determine which management interface type is supported on a router, locate the router and Routing Engine combination in Supported Routing Engines by Router and note its management Ethernet interface type, either em0 or fxp0 .

Table 1 summarizes the management interfaces typically used on Junos and Junos Evolved platforms. It's always a good idea to refer to the specific documentation for your platform to confirm details about its management interface.

Refer to the Product Documentation page for details on your platform.

Alternatively, refer to the Day One + quick start guide for your platform at: Day One + Guides .

On routers with multiple Routing Engines, each Routing Engine is configured with a separate IP address for the management Ethernet interface. To access the primary Routing Engine, you must know which Routing Engine is active and use the appropriate IP address.

Optionally, for consistent access to the primary Routing Engine, you can configure an additional IP address and use this address for the management interface regardless of which Routing Engine is active. This additional IP address is active only on the management Ethernet interface for the primary Routing Engine. During switchover, the address moves to the new primary Routing Engine.

For M Series, MX Series, and most T Series routers, the management Ethernet interface is fxp0 . For TX Matrix Plus routers and T1600 or T4000 routers configured in a routing matrix, the management Ethernet interface is em0 .

Automated scripts that you have developed for standalone T1600 routers (T1600 routers that are not in a routing matrix) might contain references to the fxp0 management Ethernet interface. Before reusing the scripts on T1600 routers in a routing matrix, edit the command lines that reference the fxp0 management Ethernet interface so that the commands reference the em0 management Ethernet interface instead.

To configure an additional IP address for the management Ethernet interface, include the master-only statement at the [edit groups] hierarchy level.

In the following example, IP address is configured for both Routing Engines and includes a master-only statement. With this configuration, the address is active only on the primary Routing Engine. The address remains consistent regardless of which Routing Engine is active. IP address is assigned to fxp0 on re0 , and address is assigned to fxp0 on re1 .

This feature is available on all routers that include dual Routing Engines. On the TX Matrix router, this feature is applicable to the switch-card chassis (SCC) only.

By default, the router’s management Ethernet interface uses as its MAC address the MAC address that is burned into the Ethernet card.

For M Series, MX Series, and most T Series routers, the management Ethernet interface is fxp0 . For TX Matrix Plus routers and T1600 routers configured in a routing matrix, and TX Matrix Plus routers with 3D SIBs, T1600 routers, and T4000 routers configured in a routing matrix, the management Ethernet interface is em0 .

To display the MAC address used by the router’s management Ethernet interface, enter the show interface fxp0 or show interface em0 operational mode command.

To change the management Ethernet interface’s MAC address, include the mac statement at the [edit interfaces fxp0] or [edit interfaces em0] hierarchy level:

Specify the MAC address as six hexadecimal bytes in one of the following formats: nnnn . nnnn . nnnn (for example, 0011.2233.4455 ) or nn : nn : nn : nn : nn : nn (for example, 00:11:22:33:44:55 ).

If you integrate a standalone T640 router into a routing matrix, the PIC MAC addresses for the integrated T640 router are derived from a pool of MAC addresses maintained by the TX Matrix router. For each MAC address you specify in the configuration of a formerly standalone T640 router, you must specify the same MAC address in the configuration of the TX Matrix router.

Similarly, if you integrate a standalone T1600 router into a routing matrix, the PIC MAC addresses for the integrated T1600 router are derived from a pool of MAC addresses maintained by the TX Matrix Plus router. For each MAC address you specify in the configuration of a formerly standalone T1600 router, you must specify the same MAC address in the configuration of the TX Matrix Plus router.

Related Documentation

Junos Enterprise Routing, 2nd Edition by Peter Southwick, Doug Marschke, Harry Reynolds

Get full access to Junos Enterprise Routing, 2nd Edition and 60K+ other titles, with a free 10-day trial of O'Reilly.

There are also live events, courses curated by job role, and more.

Interface Configuration Examples

A walkthrough of configuration examples, starting with basic examples and then getting into a few more complex configurations, will help to put this into perspective. The order of the walkthrough uses the following configuration examples:

Gigabit Ethernet interfaces

Gigabit Ethernet with VLAN tagging

T1 interface with Cisco HDLC

Serial interface with PPP

Serial interface with Frame Relay

Aggregated Ethernet interfaces

GRE Tunnel Interfaces

Initially, we will use a step-by-step approach to establish the configuration fundamentals. Then the walkthrough will move toward configuration results that build on the fundamentals and become advanced. Once you grasp the fundamentals, you should be able to follow the advanced configurations. At the end of this section, we will discuss the use of the Virtual Router Redundancy Protocol (VRRP).

Gigabit Ethernet Interface

First, let’s build an interface on router Lager that connects directly to router Ale over the ge-0/0/0 interface.

Check the status of the ge-0/0/0 interface by issuing a show interfaces ge-0/0/0 terse command. Junos interfaces are automatically “enabled” when the physical connection is wired:

If an interface needs to be administratively disabled, issue the set interfaces <interface name> disable command.

The interface appears to be physically up, so next, configure the interface to allow IP traffic to flow as well as add an IP address. Begin by entering configuration mode, dropping down to the hierarchy of the interface, and configuring the correct family and local IP address:

Since this is a non-VLAN-tagged Ethernet interface, unit 0 must be used when configuring the logical properties of family inet.

Also, note that Junos requires a mask for every IP address in the classless interdomain routing (CIDR) “slash” notation. An absence of the mask can lead to the less desirable result of configuring a /32 subnet on your interface. (Look for other Junos address issues in Interface Troubleshooting .)

Verify the configuration and activate the changes by issuing a commit and-quit command:

Verify the status of the interface. Note that the status now includes the logical portion as well as the physical portion of the interface:

Lastly, test connectivity by issuing a ping command toward the other end of the link of Ale :

Notice the Ctrl-C sequence used to break out of the ping command. Junos will send an endless number of pings unless a break is issued or a specific number of ping packets are specified with the count command.

Gigabit Ethernet with VLAN Tagging

Continuing with our example, let’s add VLAN tagging between Lager and Ale , which is already configured with a VLAN ID of 100. The first step is to enable VLAN tagging on the physical interface of Lager :

Next, add a VLAN ID of 100 on logical unit 0:

Juniper routers do not have a default VLAN, as every VLAN must be explicitly configured. Many switches use a default VLAN of 1, so make sure you explicitly configure a vlan-id of 1 on the router for connectivity.

Although this is a valid configuration on unit 0, the best practice is to always keep the same unit number as the VLAN tag, so let’s change the unit number with the rename command:

Lastly, activate the changes, verify the interface status, and test connectivity:

Notice the use of the command run to issue the operational mode command ping in configuration mode.

Also notice the use of the top command prior to the commit command. In some cases a commit can be issued only from the top. Using top will save time otherwise spent issuing multiple commit commands.

T1 Interface with Cisco HDLC Encapsulation

The T1 interface is the most popular basic physical layer protocol used by the Digital Signal level 1 (DS1) multiplexing method in North America. For point-to-point interfaces on Juniper Networks routers, the default Layer 2 encapsulation is PPP, which differs from many other vendors’ default behavior. To quickly interoperate with those vendors, change the encapsulation to the default setting, which is usually Cisco HDLC. Since we already showed the step-by-step configuration in the previous configuration, we show here only the result of adding the correct encapsulation:

An inquiring mind may wonder why the encapsulation has the word cisco in it. Is there a non-Cisco HDLC? As a matter of fact, there is! There is a standard HDLC protocol (ISO 13239), used in protocols such as X.25 and SDLC. The original specification did not have multiprotocol support, so Cisco decided to create its own version with this support with different header fields and definitions. Although this protocol is officially proprietary, the workings are open and have been implemented by many different router vendors.

Serial Interface with PPP

A serial interface can come in a variety of different physical forms, such as V.35, X.21, and EIA-530. The choice of physical media often depends on geographical location; V.35 is the most common choice in the United States and Europe, and X.21 is more common in Japan. Regardless of physical media, all serial interfaces have the same idea of defining a data circuit-terminating equipment (DCE) device and a data terminal equipment (DTE) device. The DTE device is the end unit that receives data encoding, clocking, and signal conversion from the DCE device. In modern communications, the DCE device often takes the form of a channel service unit/data service unit (CSU/DSU) or a modem; however, when connecting two routers in a back-to-back fashion, one of the routers takes the role of a DCE.

Router Ale and router Bock have a back-to-back serial connection using V.35 with the default encapsulation of PPP. Normally, a router will default to DTE mode, but in this case, Ale is automatically chosen as the DCE based on the detection of a DCE cable. You can observe this detection in the Local mode field of the show interfaces command:

Since one of the roles of the DCE is to provide clocking to the DTE, an internal clocking mode needs to be configured on Ale . This allows Ale to generate a clocking signal toward Bock using the internal clock with a default clock rate of 8 MHz:

Bock has no clocking mode configured and takes the default clock mode of loop-timed, which takes the transmitted clock from Ale . Bock could also have been configured for DCE mode, which would have the same result in this case. Here is the Bock configuration:

You can verify the local mode, clocking mode, and clock rate on Bock by using the show interfaces command:

Clocking can often be a confusing topic for many users. For back-to-back router connections, Juniper made it simple by allowing multiple different clocking modes to be configured and still “do the right thing.” The only combinations that will not work for back-to-back connections are the DCE in loop mode and the DTE in loop or DCE mode. However, when connecting to a CSU/DSU or a modem, proper care must be taken to configure the correct clock mode.

Serial Interface with Frame Relay

Frame Relay is a Layer 2 encapsulation that enables the connection of your LAN via a WAN connection to a Frame Relay node. Frame Relay creates a tunnel called a permanent virtual circuit (PVC) over a private or leased line to provide connectivity to other sites over the Internet service provider’s (ISP’s) infrastructure. With the emergence of DSL and IP-based networks, Frame Relay is not often seen anymore, except in rural areas as a cheaper, “always on” connection.

To establish a Frame Relay connection with the Frame Relay node, the proper encapsulation of frame-relay (RFC 1490 ) must be configured as well as the local circuit identifier for the PVC represented by the logical property of a dlci number:

The router can also support back-to-back router connections by configuring one router to operate in DCE mode or by turning off keepalives on each router. If keepalives are disabled, the router will not wait for any local management messages to enable that interface. Also, turning keepalives off can help in troubleshooting by allowing for loopback testing, which we’ll discuss later in this chapter.

ADSL Using PPPoE over ATM

DSL is one of the more popular connection media for both companies and consumers because the local service is provided via a normal phone line with a DSL modem. This connection terminates at the telco digital subscriber line access multiplexer (DSLAM), a device that concentrates multiple DSL connections together. Some J-series routers have support for ATM over asymmetrical digital subscriber line (ADSL)—Annex A for DSL over POTS or Annex B for DSL over ISDN—and symmetric high-speed digital subscriber line (SHDSL) configurations that allow them to act as the DSL modem at the customer site. The interfaces appear to be ATM connections but do not support native ATM, only the use of ATM over a DSL connection.

Router PBR has an ADSL Annex A PIM installed in slot 6 and will act as a client to the DSLAM. This connection is using Point-to-Point Protocol over Ethernet (PPPoE) over ATM for the DSL connection, which requires that two different interfaces be configured. The first interface that is configured is the physical ATM interface of at-6/0/0 . To configure the interface, the ATM virtual path and virtual channel identities must be the same values that are provisioned at the DSLAM. The rest of the parameters can be learned from the DSLAM by setting an operating mode of auto. Since PBR will be using PPPoE, the encapsulation must be configured at both the physical and the logical layers:

The next interface that must be configured is the PPPoE internal router interface. This interface maps the physical interface where PPPoE will be running, sets the access server’s name and underlying service to be requested, and sets an IP address. The IP address can be learned automatically from the access server by specifying the negotiate-address command, as seen in the configuration of PBR that follows, or by setting the IP address to be static:

You can verify the correct operation of the PPPoE negotiation by issuing the show pppoe interfaces command:

To incrementally increase the speed of individual PPP links without adding speed to the physical interfaces, the Multilink Point-to-Point Protocol (MLPPP) was created under RFC 1990 . This is essentially a “software” bond of multiple physical PPP interfaces to form one larger logical link, called a bundle . Junos allows for up to eight physical interfaces to be assigned to a bundle.

To support MLPPP on any Juniper Networks router, the router must support this special service. This support could be in the form of an additional hardware PIC on an M-series router, or it could inherit software support on other Juniper routers.

The first step is to configure the pseudolink service interface, which takes the form of lsq-0/0/0 on J-series, MX, and SRX routers, or an ml , lsq , or ls interface on an M-series router, depending on the PIC type. This interface will take all the same characteristics of a normal PPP interface, such as an IP address, but will have a logical encapsulation of multilink-ppp . This is configured at the logical layer of the interface to allow multiple bundles and types of bundles on the same router by configuring multiple unit numbers. As shown here, the bundle is assigned to logical unit 0:

Next, configure the physical interfaces to link the newly created link service interface. In the following example, interfaces se-1/0/0 and se-1/0/1 are linked to the logical bundle unit 0 on the ls-0/0/0 interface:

To verify the status, issue the show interfaces terse command. Notice that both the serial interfaces and the link service interfaces are tracked. The link service will be in the up state as long as one of the physical interfaces is also in the up state. You can modify this by configuring the minimum-links number command under the link service interface. This command sets the number of physical links that must be in the up state for the bundle to be labeled up:

Notice the use of an “or” statement in the match criteria. The use of quotes and the pipe symbol denotes an or statement for the match, looking for lines that contain either se or lsq- .

Aggregated Ethernet

The IEEE 802.3ad standard defines a means to bundle multiple Ethernet interfaces into an aggregate group. Traffic is passed over all members of the group in a load-balancing arrangement. The link aggregation control protocol (LACP) can be added to monitor the bundle, allowing interfaces to be added or subtracted from the bundle without loss of traffic.

The use of 802.3ad allows multiple connections between a router and a switch without the possibility of a broadcast storm. This improves performance and has a quicker recovery time than using a spanning tree protocol.

The configuration of 802.3ad has three parts: setting the chassis parameters, the aggregate interface, and the participating interfaces. The chassis parameters define the total number of aggregate interfaces that will be set on the router. In this example, we are installing only a single aggregate interface:

The aggregate interface uses an internal interface type of ae0. This interface carries the logical interface properties for the interface—in this case, the IP address for the bundle:

Finally the participating interfaces are added to the configuration. Up to 10 Ethernet interfaces can be added to an aggregate bundle. These interfaces can be in any location on the router:

Once the configuration is entered and committed, the ae0 interface is monitored as any other interface on the router. The show interfaces ae0 command shows the interface’s bandwidth and status. The show interface terse command shows the addresses of the aggregate interface and the bundle of the aggregated Ethernet interfaces:

Generic Routing Encapsulation (GRE) is a tunneling protocol that enables the transport of a variety of Layer 3 protocols. The tunnel created by GRE was designed to be “stateless” with no monitoring of the tunnel endpoint. GRE tunnels are used for a variety of applications, including providing backup links, transporting non-IP protocols over an IP network, and connecting “islands” of IP networks.

To create a GRE tunnel on a Juniper Networks router, the router must be equipped with Layer 2 service capabilities, which are native in the J-series, MX, and SRX routers and are available via a hardware PIC in an M-series router. When these services are enabled on a router, a pseudointerface called gr is created. The interface must be configured with the source IP address for the GRE packets, the destination of the tunnel, and the families of protocols that will be carried in the protocol. The GRE tunnel configured in the following case is carrying IP traffic and is using a source IP address of and a destination of An IP address for the gr-0/0/0 interface is not required but could be useful for management purposes:

It is important not to mistake the internal gre interface with the gr interface on the router. The gre interface is used by the router internally and should not be configured to create GRE tunnels.

The final piece is mapping actual traffic for use by the GRE tunnel. This is accomplished in a variety of methods depending on the type of traffic entering the GRE tunnel. Common mapping examples for IP include creating a static route with a next-up of the gr interface or even running a routing protocol such as Open Shortest Path First (OSPF) over the interface!

Anybody using a PC for Internet surfing, music downloads, or gaming uses IP as the network protocol. The PC will have an IP address assigned as well as a default gateway address to reach any destinations that are not on the local subnet. In the following code snippet, a PC is using an IP address of with a mask of and a default gateway of

This default gateway address is either statically defined by the user or learned via the Dynamic Host Configuration Protocol (DHCP) process. Regardless of the method, the default gateway will be used as the next hop address for the default route that will be created to reach remote destinations:

If the default gateway was a single device and that device failed, a PC would not be able to reach destinations outside the local subnet. In a fault-tolerant network, it would be ideal to have a backup gateway device, without having to modify the configuration on the PC, as well as being able to load-share with multiple PCs on the LAN.

VRRP was created to eliminate single points of behavior that are inherent to static default routed networks. VRRP creates a logical grouping of multiple physical routers to a “virtual” router that will be used as the default gateway for end hosts. This allows the PC to always maintain the same gateway address even if the physical gateway has changed (see Figure 4-16 ). The routers that are part of the same VRRP logical group will share this “virtual” IP address as well as a “virtual” media access control (MAC) address. Essentially VRRP describes an election protocol to maintain ownership of this virtual IP (VIP) address and MAC address. One router in the VRRP group will be the master router, which controls this VIP address unless a failure occurs that results in a release of that ownership. This failure causes another router to claim ownership of the VIP by issuing a VRRP message and a gratuitous Address Resolution Protocol (ARP) to claim the virtual MAC address. Once a router becomes the master, it will periodically advertise VRRP messages to indicate its overall health and reachability.

When configuring VRRP for the first time on a Juniper Networks router, it can seem like locating the configuration is similar to trying to find a needle in a haystack. The configuration will be within the logical property and will be configured after the family inet address. A VRRP group value (1–255) is assigned on every router that needs to be part of the virtual router. Also, a VIP address is assigned that the hosts will use as their gateway address. This could be an address owned by one of the routers in the group or an address taken out of the address block owned by the LAN. Lastly, a priority value can be configured to change the default value of 100, which is used to elect the master router of the VRRP group. The router with the highest priority value becomes the master for that group; if the priorities are equal, the tiebreaker goes to the highest local LAN IP address:

VRRP example

Figure 4-16. VRRP example

Verify the operation of VRRP with the show vrrp summary command. Router Lager is the master for group 1 because it has a higher priority:

Priority values range from 0–255; however, only values 1–254 are configurable. Priority 0 is reserved for the master router to issue an immediate release of mastership. A priority of 255 is used if the VIP is an actual interface IP that is owned by that router.

Another option that can be configured is the ability to track the interface priority settings. If an interface goes down, the advertised priority will be subtracted by a configured value. This could result in a new master router for the virtual router. This is very useful to ensure upstream reachability. In the example on Lager , a T1 interface is being tracked. If this interface goes down, 150 will be subtracted from the configured priority of 200:

You can force an interface failure by administratively disabling the T1 interface:

The result of this failure is a mastership change, as Lager is now the backup router:

Notice in the show vrrp track command that Lager has a configured ( cfg ) priority value of 200, but a priority of 50 is currently being used because we’ve subtracted the cost of 150 from the downed T1 interface:

The default behavior of VRRP is to use preemption , which causes a router with a higher priority to become the master at any time. When Lager ’s T1 interface is reenabled, it will again become the master for the virtual router:

Since preemption could cause a temporary disruption in the network, a no-preempt command can also be configured.

Lastly, according to RFC 3768 , “A VRRP router SHOULD not forward packets addressed to the VIP Address(es) it becomes Master for if it is not the owner.” That means if we have an IP address that is not owned by any router and is simply an address from the subnet that was used as the VIP, operational issues may appear. The most common issue is not being able to ping the virtual address. In the case just examined, was the VIP address chosen out of the 10.40.1/24 subnet, but it was not actually configured on either Lager or Ale . Juniper routers allow you to break this rule by configuring the accept-data command to allow the master router to respond to the VIP address. This will allow testing to occur toward the VIP; however, care must be taken to avoid unnecessary traffic on the LAN.

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assign ip to interface juniper

Network Encyclopedia

Basic configuration of a juniper router.

Basic Configuration of a Juniper Router

JUNOS Operational Mode

After connecting to the router, the first prompt displayed is the request for a password. After you correctly enter the password, you enter the router’s {master} mode, and the router > prompt is displayed, indicating that you are in the operational mode. The text preceding the > lists the name of the user and the router.

The JUNOS operating system has another option that enables the user to enter only part of a command. With this feature, the incomplete command will be completed by JUNOS if the user is still in the operational mode, indicated by the > prompt. This means the user doesn’t have to remember the full command. JUNOS will fill in the expected text given the information obtained from the entered keystrokes.

Out of Band Management Indicates that an additional interface can be used to connect to the router if the main network is down.

Router Configuration Mode

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