Layer 3 switches are superfast routers that do Layer 3 forwarding in hardware (ASIC chips) at very high speeds - at wire speeds (In general-purpose routers, packet switching takes place using a microprocessor (CPU) and a software, whereas a Layer 3 switch performs this using application-specific integrated circuit (ASIC) hardware) , there is no functional difference between layer 3 switching and routing. For Layer 3 switches to completely eliminate the need for the traditional router they need to provide WAN connectivity, all IP Services supplied by traditional routers, and be able to run all the required routing protocols (IGPs and BGP), its all a commercial game now, since all the current high end routers has inherited the layer 3 switches hardware architecture - the clearest example is Cisco Catalyst 6500 and Cisco 7600 routers which are clones.
The L3 switch uses hardware for switching and routing known as ASIC Application Specific Integrated Circuit which is faster as compare to Router which uses Microprocessor software based routing which is slow.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...