Rapid Spanning Tree Protocol

IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) enhances the 802.1D standard with one goal in mind: improving STP convergence. To do so, RSTP defines new variations on BPDUs between switches, new port states, and new port roles, all with the capability to operate backwardly compatible with 802.1D sw...

Access Design

In most cases, an access router serves a large number of customers. With modern access technology, this number can reach the thousands. As a result, resilient connectivity to the distribution routers is recommended. This may be accomplished using a self-healing LAN technology, such as FDDI. Alternat...

Distribution/Regional Network Design

The role of the regional network is to route intra- and inter-regional traffic. The regional network generally is comprised of a DC as the hub and a number of access POPs as the spokes. Usually, two redundant routers in each regional network will connect to the backbone.   DCs may also...

Configuring Serial Interfaces

When you configure a router's serial interface, you need to specify the encapsulation, the IP address, and whether the interface will be the DCE or DTE: Router3#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router3(config)#interface Serial1 Router3(conf...

Configuring RIP Version 2

By default, Cisco routers will listen for both RIP Version 1 and 2 packets, but they will only send Version 1. If you want to configure the router to send and receive only Version 2 RIP packets, use the version 2 configuration command: Router2#configure terminal Enter configuration commands, one ...

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