You can add a text description to a switch port’s configuration to help identify it. This description is meant as a comment field only, as a record of port use or other unique information. The port description is included when displaying the switch configuration and interface information. To assign a comment or description to a port, enter the following command in interface configuration mode: Switch(config-if)# description description-string The descri..
NSF has supported data and research on networking needs since 1986. NSF also supported the goals of the High Performance Computing and Communications (HPCC) Program, which promoted leading-edge research and science programs. The National Research and Education Network (NREN) Program, which is a subdivision of the HPCC Program, called for gigabitper- second (Gbps) networking for research and education to be in place by the mid-1990s. All these requirements, in addition to the ..
Integrated IS-IS NBMA Design Solutions
Designing IS-IS networks across NBMA WANs is not as straightforward as designing other protocols, such as EIGRP, because IS-IS does not explicitly support NBMA. On the other hand, IS-IS over NBMA is not as complicated as OSPF either. In the good old days, most organizations had a broadcast network (such as Ethernet) for the LAN and point-to-point links (such as serial links) for the WAN. Accommodating these different technologies when building a routing protocol made ..
The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward traffic to the default originating router. Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..
Certain traffic types, such as Layer 2 keepalives and Layer 3 routing protocol messages, are absolutely critical to maintaining network stability. Therefore, it is vital to understand how the Cisco IOS Software handles these traffic types, especially when provisioning WAN links that might experience sustained periods of congestion. By default, Cisco IOS Software (in accordance with RFC 791 and RFC 2474) marks Interior Gateway Protocol (IGP) traffic (such as Routing Informati..
