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
http://www.ebrahma.com/2013/08/configuring-routed-vlan-interfaces-on-juniper-ex-series-switches/Labels: eBrahma