1700, 1800, 2600 or 2800 models), there are also some Layer-2 capabilities such as bridging and switching. 1600 or 2500 model), there are only basic Layer-3 capabilities such as running dynamic routing protocol, terminating Serial ports, and running non-IP protocols such as IPX and SNA. In router world, early Cisco routers (i.e. Catalyst 3550 or 3560 switches), there are also some routing capabilities such as terminating multiple Layer-3 interfaces and running dynamic routing protocol. Catalyst 3500 switches), there are only basic Layer-2 capabilities such as bridging and switching.
To understand better of switching router and routing switch differences, following is an illustration. Routers have also performed a wide variety of "high touch" and value added features such as tunneling, data-link switching (DLSw), protocol translation, access lists, and Dynamic Host Configuration Protocol ( DHCP) relay. Because of the complexity of these tasks, routers have traditionally been software-based devices. Conversely, the term router has been used to refer to a device that runs routing protocols to discover the Layer-3 topology and makes forwarding decisions based on hierarchical Layer-3 addresses. For example, ATM switches perform hardware-based forwarding of fixed-length cells whereas Ethernet switches use MAC addresses to make forwarding decisions. The term switch was reserved for hardware-based platforms that generally functioned at Layer-2. In the past, switches and routers have been separate and distinct devices. Some of this bewilderment arises from the recent merging of several technologies. Several factors have created significant confusion surrounding the subject of Layer-3 switch and Layer-3 switching. In the case of a switching router, it is primarily a router that may use switching technology (high-speed ASICs) for speed and performance (as well as also supporting Layer-2 bridging functions).Ĭisco: Catalyst 3550, 3560, 3750, 4500, 6500 series A router is a Layer-3 device that simply does routing only. In general, a Layer-3 switch (routing switch) is primarily a switch (a Layer-2 device) that has been enhanced or taught some routing (Layer 3) capabilities.
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