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play_arrow Understanding Layer 2 Networking
- Layer 2 Networking
play_arrow Configuring MAC Addresses
- MAC Addresses
play_arrow Configuring MAC Learning
- MAC Learning
play_arrow Configuring MAC Accounting
- MAC Accounting
play_arrow Configuring MAC Notification
- MAC Notification
play_arrow Configuring MAC Table Aging
- MAC Table Aging
play_arrow Configuring Learning and Forwarding
- Layer 2 Forwarding Tables
play_arrow Configuring Bridging and VLANs
- Bridging and VLANs
play_arrow Configuring 802.1Q VLANs
- 802.1Q VLANs Overview
- 802.1Q VLAN IDs and Ethernet Interface Types
- Configuring Dynamic 802.1Q VLANs
- Enabling VLAN Tagging
- Configuring Tagged Interface with multiple tagged vlans and native vlan
- Sending Untagged Traffic Without VLAN ID to Remote End
- Configuring Tag Protocol IDs (TPIDs) on QFX Series Switches
- Configuring Flexible VLAN Tagging on PTX Series Packet Transport Routers
- Configuring an MPLS-Based VLAN CCC with Pop, Push, and Swap and Control Passthrough
- Binding VLAN IDs to Logical Interfaces
- Associating VLAN IDs to VLAN Demux Interfaces
- Configuring VLAN and Extended VLAN Encapsulation
- Configuring a Layer 2 VPN Routing Instance on a VLAN-Bundled Logical Interface
- Example: Configuring a Layer 2 VPN Routing Instance on a VLAN-Bundled Logical Interface
- Specifying the Interface Over Which VPN Traffic Travels to the CE Router
- Configuring Access Mode on a Logical Interface
- Configuring a Logical Interface for Trunk Mode
- Configuring the VLAN ID List for a Trunk Interface
- Configuring a Trunk Interface on a Bridge Network
- Configuring a VLAN-Bundled Logical Interface to Support a Layer 2 VPN Routing Instance
- Configuring a VLAN-Bundled Logical Interface to Support a Layer 2 VPN Routing Instance
- Configuring a Layer 2 Circuit on a VLAN-Bundled Logical Interface
- Example: Configuring a Layer 2 Circuit on a VLAN-Bundled Logical Interface
- Guidelines for Configuring VLAN ID List-Bundled Logical Interfaces That Connect CCCs
- Specifying the Interface to Handle Traffic for a CCC
- Specifying the Interface to Handle Traffic for a CCC Connected to the Layer 2 Circuit
play_arrow Configuring Static ARP Table Entries
- Static ARP Table Entries Overview
- Static ARP Entries on Ethernet Interfaces
- Configuring Static ARP Table Entries For Mapping IP Addresses to MAC Addresses
- Example: Configuring Static ARP Entries on Ethernet Interfaces
play_arrow Configuring Restricted and Unrestricted Proxy ARP
- Restricted and Unrestricted Proxy ARP Overview
- Configuring Restricted and Unrestricted Proxy ARP
play_arrow Configuring Gratuitous ARP
- Configuring Gratuitous ARP
play_arrow Adjusting the ARP Aging Timer
- Adjusting the ARP Aging Timer
play_arrow Configuring Tagged VLANs
- Configuring Tagged VLANs
play_arrow Stacking and Rewriting Gigabit Ethernet VLAN Tags
- Stacking and Rewriting Gigabit Ethernet VLAN Tags Overview
- Stacking and Rewriting Gigabit Ethernet VLAN Tags
- Configuring Frames with Particular TPIDs to Be Processed as Tagged Frames
- Configuring Tag Protocol IDs (TPIDs) on PTX Series Packet Transport Routers
- Configuring Stacked VLAN Tagging
- Configuring Dual VLAN Tags
- Configuring Inner and Outer TPIDs and VLAN IDs
- Stacking a VLAN Tag
- Stacking Two VLAN Tags
- Removing a VLAN Tag
- Removing the Outer and Inner VLAN Tags
- Removing the Outer VLAN Tag and Rewriting the Inner VLAN Tag
- Rewriting the VLAN Tag on Tagged Frames
- Rewriting a VLAN Tag on Untagged Frames
- Rewriting a VLAN Tag and Adding a New Tag
- Rewriting the Inner and Outer VLAN Tags
- Examples: Stacking and Rewriting Gigabit Ethernet IQ VLAN Tags
- Understanding Transparent Tag Operations and IEEE 802.1p Inheritance
- Understanding swap-by-poppush
- Configuring IEEE 802.1p Inheritance push and swap from the Transparent Tag
play_arrow Configuring Private VLANs
- Private VLANs
- Understanding Private VLANs
- Bridge Domains Setup in PVLANs on MX Series Routers
- Bridging Functions With PVLANs
- Flow of Frames on PVLAN Ports Overview
- Guidelines for Configuring PVLANs on MX Series Routers
- Configuring PVLANs on MX Series Routers in Enhanced LAN Mode
- Example: Configuring PVLANs with Secondary VLAN Trunk Ports and Promiscuous Access Ports on a QFX Series Switch
- IRB Interfaces in Private VLANs on MX Series Routers
- Guidelines for Configuring IRB Interfaces in PVLANs on MX Series Routers
- Forwarding of Packets Using IRB Interfaces in PVLANs
- Configuring IRB Interfaces in PVLAN Bridge Domains on MX Series Routers in Enhanced LAN Mode
- Example: Configuring an IRB Interface in a Private VLAN on a Single MX Series Router
play_arrow Configuring Layer 2 Bridging Interfaces
- Layer 2 Bridging Interfaces Overview
- Configuring Layer 2 Bridging Interfaces
- Example: Configuring the MAC Address of an IRB Interface
play_arrow Configuring Layer 2 Virtual Switch Instances
- Layer 2 Virtual Switch Instances
play_arrow Configuring Link Layer Discovery Protocol
- LLDP Overview
- Configuring LLDP
- Example: Configuring LLDP
- Configuring the Transmission of Maximum VLAN Name TLVs in LLDP
- LLDP Operational Mode Commands
- Tracing LLDP Operations
play_arrow Configuring Layer 2 Protocol Tunneling
- Layer 2 Protocol Tunneling (L2PT)
play_arrow Configuring Virtual Routing Instances
- Virtual Routing Instances
play_arrow Configuring Layer 3 Logical Interfaces
- Layer 3 Logical Interfaces
play_arrow Configuring Routed VLAN Interfaces
- Routed VLAN Interfaces
play_arrow Configuring Integrated Routing and Bridging
- Integrated Routing and Bridging
play_arrow Configuring VLANS and VPLS Routing Instances
- VLANs and VPLS Routing Instances
play_arrow Configuring Multiple VLAN Registration Protocol (MVRP)
- Multiple VLAN Registration Protocol
play_arrow Configuring Ethernet Ring Protection Switching
- Example: Configuring Ethernet Ring Protection Switching on EX Series Switches
- Example: Configuring Ethernet Ring Protection Switching on QFX Series and EX Series Switches Supporting ELS
play_arrow Configuring Q-in-Q Tunneling and VLAN Translation
- Configuring Q-in-Q Tunneling and VLAN Q-in-Q Tunneling and VLAN Translation
play_arrow Configuring Redundant Trunk Groups
- Redundant Trunk Groups
- Q-in-Q Support on Redundant Trunk Links Using LAGs with Link Protection
play_arrow Configuring Proxy ARP
- Proxy ARP
play_arrow Configuring Layer 2 Interfaces on Security Devices
- Layer 2 Interfaces on Security Devices
play_arrow Configuring Security Zones and Security Policies on Security Devices
- Security Zones and Security Policies on Security Devices
play_arrow Configuring Ethernet Port Switching Modes on Security Devices
- Ethernet Port Switching Modes on Security Devices
play_arrow Configuring Ethernet Port VLANs in Switching Mode on Security Devices
- Ethernet Port VLANs in Switching Mode on Security Devices
play_arrow Configuring Secure Wire on Security Devices
- Secure Wire on Security Devices
play_arrow Configuring Reflective Relay on Switches
- Reflective Relay on Switches
play_arrow Configuring Edge Virtual Bridging
- Edge Virtual Bridging
play_arrow Troubleshooting Ethernet Switching
- Troubleshooting Ethernet Switching
- Troubleshooting Ethernet Switching on EX Series Switches
play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview

list Table of Contents

English

Example: Configuring the MAC Address of an IRB Interface

date_range 20-Dec-24

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This example shows how to configure the media access control (MAC) address of an integrated routing and bridging (IRB) interface for devices with Modular Port Concentrator (MPC) cards . An IRB interface is a Layer 3 routing interface that is used in a bridge domain or virtual private LAN service (VPLS) routing.

Requirements

This example requires the following hardware and software components:

MX Series routers with MPC cards.
Junos OS Release 13.2 or later running on all devices.

Overview

Junos OS Release 13.2 and later support the assignment of MAC addresses to IRB logical interfaces. The IRB logical interfaces provide support for simultaneous Layer 2 bridging and Layer 3 routing within the same bridge domain. Packets that arrive on an interface of the bridge domain are either switched or routed, based on the destination MAC address of the packet. The packets with the router’s Layer 2 virtual MAC address, which is manually configured, are switched to Layer 2 interfaces.

Configuring a MAC address of an IRB logical interface allows the use of a transparent firewall between two VLANs on the same switch. When both VLANs are on the same subnet and traffic from one VLAN needs to go through the firewall to the host on the other VLAN, then the VLAN tag is changed to communicate with the host on the other VLAN.

Before the introduction of this feature, if the MAC address of an IRB logical interface was the same for both VLANs, the firewall dropped the traffic. This new feature allows you to configure distinct MAC addresses for different VLANs, which facilitates the exchange of traffic between two VLANs on the same switch.

In case of VPLS multihoming, if there is a failover of the primary provider edge (PE) router to a secondary PE router, the MAC address of an IRB changes. The hosts connected to the customer edge (CE) router must change their Address Resolution Protocol (ARP) for IRB’s IP and MAC address. This feature allows you to configure the same MAC address for IRB interfaces in both the primary and secondary PE routers and eliminates the need for changing the ARP binding of the IRB logical interface in CE routers, in case of a failover.

Figure 1 shows the sample topology.

Topology

Figure 1: Configuring the MAC Address of an IRB Interface

In this example you configure MAC address of IRB logical interfaces.

Configuration

CLI Quick Configuration
Configuring the MAC Address of an IRB Interface
Results

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Router R0

content_copy zoom_out_map
set interfaces ge-1/3/8 vlan-tagging
set interfaces ge-1/3/8 encapsulation flexible-ethernet-services
set interfaces ge-1/3/8 unit 10 encapsulation vlan-bridge
set interfaces ge-1/3/8 unit 10 vlan-id 10
set interfaces irb unit 10 family inet address 10.1.10.1/24
set interfaces irb unit 10 family mpls
set interfaces irb unit 10 mac 00:00:00:00:00:01
set interfaces lo0 unit 10 family inet address 192.168.255.10/32
set protocols rsvp interface irb.10
set protocols mpls label-switched-path R0-1-R2 to 192.168.255.2
set protocols mpls label-switched-path R0-1-R2 install 192.168.255.2/32 active
set protocols mpls label-switched-path R0-1-R2 no-cspf
set protocols mpls interface irb.10
set protocols bgp group ibgp type internal
set protocols bgp group ibgp local-address 192.168.255.10
set protocols bgp group ibgp neighbor 192.168.255.2
set protocols ospf area 0.0.0.0 interface irb.10
set protocols ospf area 0.0.0.0 interface lo0.10 passive
set protocols ldp interface irb.10
set protocols ldp interface lo0.10
set routing-options autonomous-system 400
set bridge-domains lsbd1 vlan-id 10
set bridge-domains lsbd1 interface ge-1/3/8.10
set bridge-domains lsbd1 routing-interface irb.10

Router R1

content_copy zoom_out_map
set interfaces ge-1/3/8 vlan-tagging
set interfaces ge-1/3/8 encapsulation flexible-ethernet-services
set interfaces ge-1/3/8 unit 10 encapsulation vlan-bridge
set interfaces ge-1/3/8 unit 10 vlan-id 10
set interfaces ge-1/2/8 vlan-tagging
set interfaces ge-1/2/8 encapsulation flexible-ethernet-services
set interfaces ge-1/2/8 unit 40 encapsulation vlan-bridge
set interfaces ge-1/2/8 unit 40 vlan-id 40
set interfaces irb unit 20 family inet address 10.1.10.2/24
set interfaces irb unit 20 family mpls
set interfaces irb unit 20 mac 00:00:00:00:00:02
set interfaces irb unit 30 family inet address 10.1.12.1/24
set interfaces irb unit 30 family mpls
set interfaces irb unit 30 mac 00:00:00:00:00:03
set interfaces lo0 unit 20 family inet address 192.168.255.1/32
set protocols rsvp interface irb.20
set protocols rsvp interface irb.30
set protocols mpls interface irb.30
set protocols mpls interface irb.20
set protocols ospf area 0.0.0.0 interface irb.20
set protocols ospf area 0.0.0.0 interface irb.30
set protocols ospf area 0.0.0.0 interface lo0.20 passive
set protocols ldp interface irb.20
set protocols ldp interface irb.30
set protocols ldp interface lo0.20
set routing-options autonomous-system 400
set bridge-domains lsbd2 vlan-id 10
set bridge-domains lsbd2 interface ge-1/3/8.10
set bridge-domains lsbd2 routing-interface irb.20
set bridge-domains lsbd3 vlan-id 40
set bridge-domains lsbd3 interface ge-1/2/8.40
set bridge-domains lsbd3 routing-interface irb.30

Router R2

content_copy zoom_out_map
set interfaces ge-1/2/8 vlan-tagging
set interfaces ge-1/2/8 encapsulation flexible-ethernet-services
set interfaces ge-1/2/8 unit 40 encapsulation vlan-bridge
set interfaces ge-1/2/8 unit 40 vlan-id 40
set interfaces irb unit 40 family inet address 10.1.12.2/24
set interfaces irb unit 40 family mpls
set interfaces irb unit 40 mac 00:00:00:00:00:04
set interfaces lo0 unit 30 family inet address 192.168.255.2/32
set protocols rsvp interface irb.40
set protocols mpls label-switched-path R2-1-R0 to 192.168.255.10
set protocols mpls label-switched-path R2-1-R0 no-cspf
set protocols mpls interface irb.40
set protocols bgp group ibgp type internal
set protocols bgp group ibgp local-address 192.168.255.2
set protocols bgp group ibgp neighbor 192.168.255.10
set protocols ospf area 0.0.0.0 interface irb.40
set protocols ospf area 0.0.0.0 interface lo0.30 passive
set protocols ldp interface irb.40
set protocols ldp interface lo0.30
set routing-options autonomous-system 400
set bridge-domains lsbd4 vlan-id 40
set bridge-domains lsbd4 interface ge-1/2/8.40
set bridge-domains lsbd4 routing-interface irb.40

Configuring the MAC Address of an IRB Interface

Step-by-Step Procedure

The following example requires that you navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode in the CLI User Guide.

Note:

Repeat this procedure for Juniper Networks Routers R1 and R2, modifying the appropriate interface names, addresses, and any other parameters for each router.

To configure the MAC address of an IRB interface on Router R0:

Configure the physical interfaces.

content_copy zoom_out_map
[edit interfaces ge-1/3/8]
user@R0# set vlan-tagging
user@R0# set encapsulation flexible-ethernet-services
user@R0# set unit 10 encapsulation vlan-bridge
user@R0# set unit 10 vlan-id 10

Configure the IRB logical interface.

content_copy zoom_out_map
[edit interfaces irb]
user@R0# set unit 10 family inet address 10.1.10.1/24
user@R0# set unit 10 family mpls
user@R0# set unit 10 mac 00:00:00:00:00:01
[edit interfaces]
user@R0# set lo0 unit 10 family inet address 192.168.255.10/32

Configure the RSVP protocol.

content_copy zoom_out_map
[edit protocols rsvp]
user@R0# set interface irb.10

Configure the MPLS protocol.

content_copy zoom_out_map
[edit protocols mpls]
user@R0# set label-switched-path R0-1-R2 to 192.168.255.2
user@R0# set label-switched-path R0-1-R2 install 192.168.255.2/32 active
user@R0# set label-switched-path R0-1-R2 no-cspf
user@R0# set interface irb.10
user@R0# set interface irb.10

Configure the BGP protocol.

content_copy zoom_out_map
[edit protocols BGP]
user@R0# set group ibgp type internal
user@R0# set group ibgp local-address 192.168.255.10
user@R0# set group ibgp neighbor 192.168.255.2

Configure the OSPF protocol.

content_copy zoom_out_map
[edit protocols ospf]
user@R0# set area 0.0.0.0 interface irb.10
user@R0# set area 0.0.0.0 interface lo0.10 passive

Configure the LDP protocol.

content_copy zoom_out_map
[edit protocols ldp]
user@R0# set interface irb.10
user@R0# set interface lo0.10

Configure the autonomous system (AS) number.
```
[edit routing-options]
user@R0# set autonomous-system 400
```

Configure the bridge domains.

content_copy zoom_out_map
[edit]
user@R0# set bridge-domains lsbd1 vlan-id 10
user@R0# set bridge-domains lsbd1 interface ge-1/3/8.10
user@R0# set bridge-domains lsbd1 routing-interface irb.10

Results

From configuration mode, enter the show interfaces, show protocols and show bridge-domains, commands and confirm your configuration. If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.

content_copy zoom_out_map
    user@R0# show interfaces
    ge-1/3/8 {
        unit 10 {
            encapsulation vlan-bridge;
            vlan-id 10;
        }
    }
    irb {
        unit 10 {
            family inet {
                mtu 1450;
                address 10.1.10.1/24;
            }
            family mpls;
            mac 00:00:00:00:00:01;
        }
    }
    lo0 {
        unit 10 {
            family inet {
                address 192.168.255.10/32;
            }
        }
    }
    user@R0# show protocols
    rsvp {
        interface irb.10;
    }
        mpls {
            label-switched-path R0-1-R2 {
                to 192.168.255.2;
                install 192.168.255.2/32 active;
                no-cspf;
            }
            interface irb.10;
        }
        bgp {
            group ibgp {
                type internal;
                local-address 192.168.255.10;
                neighbor 192.168.255.2;
            }
        }
        ospf {
            area 0.0.0.0 {
                interface irb.10;
                interface lo0.10 {
                    passive;
                }
            }
        }
        ldp {
            interface irb.10;
            interface lo0.10;
        }
    user@R0# show bridge-domains
    lsbd1 {
        vlan-id 10;
        interface ge-1/3/8.10;
        routing-interface irb.10;
    }

If you are done configuring the devices, commit the configuration.

content_copy zoom_out_map
user@host# commit

Verification

Confirm that the configuration is working properly.

Verifying the MAC Address of the IRB Interface

Purpose
Action
Meaning

Purpose

Verify that the specified MAC address is assigned to the IRB interface.

Action

From operational mode, run the show interfaces irb command on the device.

user@host# show interfaces irb

content_copy zoom_out_map
Physical interface: irb, Enabled, Physical link is Up
  Interface index: 132, SNMP ifIndex: 505
  Type: Ethernet, Link-level type: Ethernet, MTU: 1514
  Device flags   : Present Running
  Interface flags: SNMP-Traps
  Link type      : Full-Duplex
  Link flags     : None
  Current address: 80:71:1f:c2:58:f0, Hardware address: 80:71:1f:c2:58:f0
  Last flapped   : Never
    Input packets : 0
    Output packets: 0

  Logical interface irb.10 (Index 326) (SNMP ifIndex 634) 
    Flags: SNMP-Traps 0x0 Encapsulation: ENET2
    MAC: 00:00:00:00:00:01
    Bandwidth: 1000mbps
    Routing Instance: LS1/default Bridging Domain: lsbd1+10
    Input packets : 55202
    Output packets: 69286
    Protocol inet, MTU: 1450
      Flags: Sendbcast-pkt-to-re, Is-Primary, User-MTU
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.1.10/24, Local: 10.1.10.1, Broadcast: 10.1.10.255
      Addresses, Flags: Is-Preferred
        Destination: 10.1.12/24, Local: 10.1.12.1, Broadcast: 10.1.12.255
    Protocol mpls, MTU: 1500, Maximum labels: 3
      Flags: Is-Primary
    Protocol multiservice, MTU: 1500

  Logical interface irb.20 (Index 358) (SNMP ifIndex 635) 
    Flags: SNMP-Traps 0x0 Encapsulation: ENET2
    MAC: 00:00:00:00:00:02
    Bandwidth: 1000mbps
    Routing Instance: LS2/default Bridging Domain: lsbd2+10
    Input packets : 66044
    Output packets: 68464
    Protocol inet, MTU: 1450
      Flags: Sendbcast-pkt-to-re, Is-Primary, User-MTU
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.1.10/24, Local: 10.1.10.2, Broadcast: 10.1.10.255
      Addresses, Flags: Is-Preferred
        Destination: 10.1.12/24, Local: 10.1.12.2, Broadcast: 10.1.12.255
    Protocol mpls, MTU: 1500, Maximum labels: 3
      Flags: Is-Primary
    Protocol multiservice, MTU: 1500

  Logical interface irb.30 (Index 360) (SNMP ifIndex 636) 
    Flags: SNMP-Traps 0x0 Encapsulation: ENET2
    MAC: 00:00:00:00:00:03
    Bandwidth: 1000mbps
    Routing Instance: LS2/default Bridging Domain: lsbd3+40
    Input packets : 26948
    Output packets: 53605
    Protocol inet, MTU: 1500
      Flags: Sendbcast-pkt-to-re
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.1.12/24, Local: 10.1.12.2, Broadcast: 10.1.12.255
      Addresses, Flags: Is-Preferred
        Destination: 10.1.10/24, Local: 10.1.10.1, Broadcast: 10.1.10.255
    Protocol mpls, MTU: 1500, Maximum labels: 3
    Protocol multiservice, MTU: 1500

  Logical interface irb.40 (Index 355) (SNMP ifIndex 632) 
    Flags: SNMP-Traps 0x0 Encapsulation: ENET2
    MAC: 00:00:00:00:00:04
    Bandwidth: 1000mbps
    Routing Instance: LS3/default Bridging Domain: lsbd4+40
    Input packets : 40575
    Output packets: 31128
    Protocol inet, MTU: 1500            
      Flags: Sendbcast-pkt-to-re, Is-Primary
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.1.12/24, Local: 10.1.12.1, Broadcast: 10.1.12.255
    Protocol mpls, MTU: 1500, Maximum labels: 3
      Flags: Is-Primary
    Protocol multiservice, MTU: 1500

Meaning

The output shows the manually configured MAC address in the MAC field.

Note:

If you did not configure the MAC address for a logical interface, the output does not include this value. However, the device uses the MAC address of the physical interface during data transmission.

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Example: Configuring the MAC Address of an IRB Interface

Requirements

Overview

Topology

Configuration

CLI Quick Configuration

Configuring the MAC Address of an IRB Interface

Step-by-Step Procedure

Results

Verification

Verifying the MAC Address of the IRB Interface

Purpose

Action

Meaning

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Ethernet Switching User Guide

ON THIS PAGE

Example: Configuring the MAC Address of an IRB Interface

Requirements

Overview

Topology

Configuration

CLI Quick Configuration

Configuring the MAC Address of an IRB Interface

Step-by-Step Procedure

Results

Verification

Verifying the MAC Address of the IRB Interface

Purpose

Action

Meaning

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