TAILIEUCHUNG - Advanced Network Theory: Bridging and LAN Switching

Why should you be concerned about bridging? Initially, when these non-routable (for example, LAT or SNA) protocols were invented, they were only intended for use on local area networks (LANs). In today’s networks, these non-routable protocols are used between remote locations. Because these locations can only be reached via a wide area network (WAN), non-routable protocols need to be bridged across the wide area networks. Bridged protocols are typically broadcast intensive and can cause a WAN link to reach high levels of utilization, resulting in slow response times or protocol timeouts, which will affect the entire WAN to some degree | Advanced Network Theory Bridging and LAN Switching Terms you ll need to understand Broadcasts Transparent bridging TB Source-route bridging SRB Source-route transparent SRT Source-route translational bridging SR TLB Integrated routing and bridging IRB Concurrent routing and bridging CRB Encapsulated bridging Remote-source route bridging RSRB Data-link switching DLSw Bridge Protocol Data Unit BPDU Spanning Tree Protocol STP Routing information fields RIFs Virtual LANs VLANs Inter-switch link ISL Fast Ethernet Channel FEC Cisco Discovery Protocol CDP Cisco Group Management Protocol CGMP LAN emulation LANE Techniques you ll need to master Describing and configuring bridging modes on Cisco routers Using common commands to enable bridging on a Cisco router Using LAN switching and emulation Distinguishing between cut-through and store and forward switching 1 2 Chapter 3 This chapter examines bridging methods available on a Cisco router. First the chapter covers bridging topics and then LAN switching methods are reviewed. The following CCIE blueprint objectives as determined by the Cisco Systems CCIE program are covered in this chapter Transparent Bridging IEEE DEC Spanning Tree Protocol translational bridging Bridge Protocol Data Unit BPDU integrated routing and bridging IRB concurrent routing and bridging CRB access lists. Source Route Bridging Source-route translational bridging SR TLB sourceroute transparent bridging SRT data-link switching DLSw remote sourceroute bridging RSRB access lists. LAN Switching Trunking VLAN Trunk Protocol VTP inter-switch link ISL Virtual LANs VLANS Fast Ethernet Channel FEC Cisco Discovery Protocol CDP Cisco Group Management Protocol CGMP . LANE LAN Emulation Client LEC LAN Emulation Server LES broadcast and unknown server BUS LAN Emulation Configuration Server LECS Simple Server Replication Protocol SSRP . Additional information is provided for completeness and in preparation for additional subjects as the CCIE program expands. Bridging

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