Configuring Routed VLAN Interfaces (CLI Procedure)
Routed VLAN interfaces (RVIs) enable the EX Series switch to recognize which packets are being sent to local addresses so that they are bridged (switched) 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 lookups.
An interface named vlan functions as the logical router, on which you can configure a Layer 3 logical interface for each VLAN. For redundancy, an RVI can be combined with implementations of the Virtual Router Redundancy Protocol (VRRP) in both bridging and VPLS environments.
Jumbo frames of up to 9216 bytes are supported on an RVI. To route jumbo data packets on the RVI, you must configure the jumbo MTU size on the member physical interfaces of the RVI and not on the RVI itself (the vlan interface). However, for jumbo control packets—for example, to ping the RVI with a packet size of 6000 bytes or more—you must explicitly configure the jumbo MTU size on the interface named vlan (the RVI).
Caution: Setting or deleting the jumbo MTU size on the RVI (the vlan interface) while the switch is transmitting packets might result in dropped packets.
To configure the routed VLAN interface (RVI):
- Create a Layer 2 VLAN by assigning it a name
(for example, support) and a VLAN ID (for example, 111).
user@switch# set vlans support vlan-id 111
- Assign an interface (for example, ge-0/0/18) to the VLAN (support) by naming the VLAN
as a trunk member on the logical interface, thereby making the interface
part of the VLAN’s broadcast domain.
user@switch# set interfaces ge-0/0/18 unit 0 family ethernet-switching vlan members support
- Create a logical Layer 3 RVI (vlan.111) on a subnet for the VLAN’s broadcast domain.
user@switch# set interfaces vlan unit 111 family inet address 184.108.40.206/24
- Link the Layer 2 VLAN to the logical Layer 3
user@switch# set vlans support l3-interface vlan.111
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 vlan terse
Interface Admin Link Proto Local Remote vlan up up vlan.111 up up inet 220.127.116.11/24
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