Supported Platforms
Related Documentation
- QFabric System, QFX Series standalone switches
- Understanding Integrated Routing and Bridging
Configuring IRB Interfaces
Integrated routing and bridging (IRB) interfaces enable a switch to recognize which packets are being sent to local addresses so that they are bridged whenever possible and are routed only when needed. Whenever packets can be switched instead of routed, several layers of processing are eliminated. Switching also reduces the number of address look-ups.
 | Note: In versions of Junos OS that do not support Enhanced Layer 2 Software (ELS), this type of interface is called a routed VLAN interface (RVI). |
To configure the routed VLAN interface:
- Create the VLAN by assigning it a name and a VLAN ID:
[edit]
user@switch# set vlans support vlan-id 111 - Assign an interface to the VLAN by specifying the logical
interface (with the unit statement) and specifying the
VLAN name as the member:
[edit]
user@switch# set interfaces ge-0/0/18 unit 0 family ethernet-switching vlan members support - Create the subnet for the VLAN’s broadcast domain:
[edit]
user@switch# set interfaces irb unit 111 family inet address 111.111.111.1/24 - Bind a Layer 3 interface with the VLAN:
[edit]
user@switch# set vlans support l3-interface irb.111Note: If you are using a version of Junos OS that does not support ELS, you create a Layer 3 virtual interface named vlan
| Note: Layer 3 interfaces on trunk ports allow the interface to transfer traffic between multiple VLANs. Within a VLAN, traffic is bridged, while across VLANs, traffic is routed. |
You can display the configuration settings:
user@switch> show interfaces irb terse Interface Admin Link Proto Local Remote vlan up up irb.111 up up inet 111.111.111.1/24
user@switch> show vlans Name Tag Interfaces
default
None
employee-vlan 20
ge-1/0/0.0, ge-1/0/1.0, ge-1/0/2.0
marketing 40
ge-1/0/10.0, ge-1/0/20.0, ge-1/0/30.0
support 111
ge-0/0/18.0
mgmt
bme0.32769, bme0.32771*
user@switch> show ethernet-switching table
Ethernet-switching table: 1 entries, 0 learned VLAN MAC address Type Age Interfaces support 00:19:e2:50:95:a0 Static - Router
Related Documentation
- QFabric System, QFX Series standalone switches
- Understanding Integrated Routing and Bridging
Published: 2014-10-07
Supported Platforms
Related Documentation
- QFabric System, QFX Series standalone switches
- Understanding Integrated Routing and Bridging
