Segmenting the AS with Multiple Regions Separated by IBGP
The AS can be divided into multiple regions, each running different and independent IGPs. Regions are logically interconnected via a full IBGP mesh. For better redundancy, regions could also be physically interconnected in a fully meshed topology, as illustrated in Figure 9- 12. Figure 9-12. Multiple Regions Via IBGP Each region will both inject its IGP routes into IBGP and announce a default route inside the region. As a result, each region will default to the BGP bo..
Prioritizing Needs for the Data Center Site
As you review potential Data Center sites, you'll find that there are no perfect properties, that is, parcels with zero risk factors, all of the physical features you want, and the specific types and amounts of infrastructure you are looking for. Many properties are completely inappropriate for housing a Data Center, while even the most suitable are a mixed bag. Perhaps a site is in a seismically stable area and well away from sources of pollution, electromagnetic interferenc..
MPLS Architecture—The Building Blocks
As with any new technology, several new terms are introduced to describe the devices that make up the architecture. These new terms describe the functionality of each device and their roles within the MPLS domain structure. The first device to be introduced is the Label Switch Router (LSR). Any router or switch that implements label distribution procedures and can forward packets based on labels falls under this category. The basic function of label distribution procedures is..
Released in 1973,SNA was IBM's blueprint for computer communications. SNA featured multiple domains in a strictly arranged hierarchy, which was ideal for the mainframe/terminal operational model. In addition, this represented a vast improvement over the single mainframe port-per- terminal approach that had been used previously. In many ways, SNA was a great contribution to networking because it operated predictably and reliably. The original SNA hierarchy consis..
Using the Cisco Discovery Protocol
CDP is enabled by default on the router, and on all interfaces. If you have previously disabled it, and you want to re-enable CDP on the router, you can issue the cdp run global configuration command: Router1(config)#cdp run This turns on CDP processing on all supported interfaces by default. If you don't want to run CDP on a particular interface, you can use the no cdp enable command, as we did for the serial interface in the example: Router1(config)#interface Serial0/0Route..
