Using Sync and Redistributing Routes
BGP synchronization is best understood when considered in the context in which it was intended to be used—namely, in conjunction with the redistribution of BGP routes into the IGP. This method is seldom used by ISPs today, mainly because of the large number of routes that would be injected into the IGP. However, using BGP sync in conjunction with redistribution solves both problems related to the routing black hole. The key to understanding BGP sync is to know that redistr..
In most cases for production networks, using InARP makes sense. However, InARP can be disabled on multipoint and physical interfaces using the no frame-relay inverse-arp interface subcommand. InARP can be disabled for all VCs on the interface/subinterface, all VCs on the interface/subinterface for a particular Layer 3 protocol, and even for a particular Layer 3 protocol per DLCI. Interestingly, the no frame-relay inverse-arp command not only tells the router to stop sending ..
When building a wireless LAN based on Cisco SWAN, a company must choose components designed to fit into the architecture. Cisco SWAN includes the components described in Table 23-2. Table 23-2 Cisco SWAN Hardware
RIP version 2 has been modified without drastically changing the protocol. This section discusses a few of the enhancements to RIP provided for demand circuits, such as an ISDN or async connection. NOTE A demand circuit is a connection that is not in use for normal packet forwarding. It provides redundancy and cost savings. This is essentially a backup connection that is used only in the case of primary link failure. In today's internetworking envi..
Integrated Services Digital Network
ISDN is a digital service that enables network users to send and receive data, voice, and video transmissions over a network. ISDN offers a variety of link speeds, ranging from 64 kbps to 2.048 Mbps (including a signaling channel of 64 kbps). With the advent of DSL and cable, ISDN may not be a viable network solution for anything other than a backup link, because of the expense involved. Basic Rate and Primary Rate Interfaces ISDN can be supplied by a carrier in two main fo..
