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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

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Configuring Inner and Outer TPIDs and VLAN IDs

date_range 20-Dec-24

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For some rewrite operations, you must configure the inner or outer tag-protocol identifier (TPID) values and inner or outer virtual local area network identifier (VLAN ID) values. These values can be applied to either the input VLAN map or the output VLAN map. The stacked and rewriting Gigabit-Ethernet VLAN Tags are also referred to as Q-in-Q tunneling.

On Ethernet IQ, IQ2, and IQ2-E interfaces; on MX Series router Gigabit Ethernet, Tri-Rate Ethernet copper, and 10-Gigabit Ethernet interfaces; and on aggregated Ethernet interfaces using Gigabit Ethernet IQ2 and IQ2-E or 10-Gigabit Ethernet PICs on MX Series routers, to configure the inner TPID, include the inner-tag-protocol-id statement at the following hierarchy levels:
- [edit interfaces interface-name unit logical-unit-number input-vlan-map]
- [edit interfaces interface-name unit logical-unit-number output-vlan-map]
- [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number input-vlan-map]
- [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number output-vlan-map]
```
user@host# set inner-tag-protocol-id tpid;
```

For the inner VLAN ID, include the inner-vlan-id statement. For the outer TPID, include the tag-protocol-id statement. For the outer VLAN ID, include the vlan-id statement at the [edit interfaces interface-name unit logical-unit-number] hierarchy level or at the [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number] hierarchy level.

input-vlan-map {
    (pop | pop-pop | pop-swap | push | push-push | swap | swap-push | swap-swap);
    inner-tag-protocol-id tpid;
    inner-vlan-id number;
    tag-protocol-id tpid;
    vlan-id number;
}
output-vlan-map {
    (pop | pop-pop | pop-swap | push | push-push | swap | swap-push | swap-swap);
    inner-tag-protocol-id tpid;
    inner-vlan-id number;
    tag-protocol-id tpid;
    vlan-id number;
}

For aggregated Ethernet interfaces using Gigabit Ethernet IQ interfaces, include the tag-protocol-id statement for the outer TPID. For the outer VLAN ID, include the vlan-id statement at the [edit interfaces interface-name unit logical-unit-number] hierarchy level or at the [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number] hierarchy level.
```
input-vlan-map {
    (pop | push | swap);
    tag-protocol-id tpid;
    vlan-id number;
}
output-vlan-map {
    (pop | push | swap);
    tag-protocol-id tpid;
    vlan-id number;
}
```

The VLAN IDs you define in the input VLAN maps are stacked on top of the VLAN ID bound to the logical interface. For more information about binding a VLAN ID to the logical interface, see 802.1Q VLANs Overview.

All TPIDs you include in input and output VLAN maps must be among those you specify at the [edit interfaces interface-name gigether-options ethernet-switch-profile tag-protocol-id [ tpids ]] hierarchy level or [edit interfaces interface-name aggregated-ether-options ethernet-switch-profile tag-protocol-id [ tpids ]] hierarchy level. For more information, see Configuring Frames with Particular TPIDs to Be Processed as Tagged Frames.

Table 1 and Table 2 specify when these statements are required. Table 1 indicates valid statement combinations for rewrite operations for the input VLAN map. “No” means the statement must not be included in the input VLAN map for the rewrite operation. “Optional” means the statement may be optionally specified for the rewrite operation in the input VLAN map. “Any” means that you must include the vlan-id statement, tag-protocol-id statement, inner-vlan-id statement, or inner-tag-protocol-id statement.

Table 1: Rewrite Operations and Statement Usage for Input VLAN Maps
	Input VLAN Map Statements
Rewrite Operation	vlan-id	tag-protocol-id	inner-vlan-id	inner-tag-protocol-id
push	Optional	Optional	No	No
pop	No	No	No	No
swap	Any	Any	No	No
push-push	Optional	Optional	Optional	optional
swap-push	Optional	Optional	Any	Any
swap-swap	Optional	Optional	Any	Any
pop-swap	No	No	Any	Any
pop-pop	No	No	No	No

Table 2 indicates valid statement combinations for rewrite operations for the output VLAN map. “No” means the statement must not be included in the output VLAN map for the rewrite operation. “Optional” means the statement may be optionally specified for the rewrite operation in the output VLAN map.

Table 2: Rewrite Operations and Statement Usage for Output VLAN Maps
	Output VLAN Map Statements
Rewrite Operation	vlan-id	tag-protocol-id	inner-vlan-id	inner-tag-protocol-id
push	No	Optional	No	No
pop	No	No	No	No
swap	No	Optional	No	No
push-push	No	Optional	No	Optional
swap-push	No	Optional	No	Optional
swap-swap	No	Optional	No	Optional
pop-swap	No	No	No	Optional
pop-pop	No	No	No	No

Input VLAN Map with inner-vlan-id Statement, Output VLAN Map with Optional inner-tag-protocol-id Statement

[edit interfaces interface-name unit logical-unit-number]
input-vlan-map {
    pop-swap;
    inner-vlan-id number;
}
output-vlan-map {
    pop-swap;
    inner-tag-protocol-id tpid;
}

Input VLAN Map with inner-tag-protocol-id Statement, Output VLAN Map with Optional inner-tag-protocol-id Statement

[edit interfaces interface-name unit logical-unit-number]
input-vlan-map {
    pop-swap;
    inner-tag-protocol-id tpid;
}
output-vlan-map {
    pop-swap;
    inner-tag-protocol-id tpid;
}

Input VLAN Map with inner-tag-protocol-id and inner-vlan-id Statements

[edit interfaces interface-name unit logical-unit-number]
input-vlan-map {
    pop-swap;
    inner-vlan-id number;
    inner-tag-protocol-id tpid;
}

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Ethernet Switching User Guide

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