JUNOS Enterprise Switching by Harry Reynolds and Doug Marschke

Author:Harry Reynolds and Doug Marschke
Language: eng
Format: mobi, epub
Tags: COMPUTERS / Networking / General
Publisher: O’Reilly Media
Published: 2009-07-15T16:00:00+00:00

Enter the Routed VLAN Interface

While lollipop routing has a certain aesthetic appeal, it was not long before a sharp engineer realized that by adding some primitive Layer 3 functionality to the switch, a purely software-based interface construct could be implemented to provide inter-VLAN routing services without the need for an external routing device. Sort of a virtual stick, if you will.

An integrated VLAN routing capability is attractive because it serves to lower cost while increasing reliability. As long as the Layer 3 forwarding performance is on par with the device’s Layer 2 capabilities, which isn’t always the case, there is very little drawback to integrated routing; this is especially true when the device can provide Layer 3 services such as firewall filters or policing, in addition to the basic routing function.

In the Juniper architecture, the Layer 3 interface that interconnects to VLAN instances is called a Routed VLAN Interface (RVI). A similar function is provided on Cisco switches via a Switched Virtual Interface (SVI).

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