Impact of the Decision Process and NEXT_HOP on BGP Updates
The next several examples together show a sequence of events regarding the propagation of network 31.0.0.0/8 by BGP throughout the network of Figure 12-4. R6 originated the routes in the 30s (as in Example 12-4) by redistributing EIGRP routes learned from R9. The purpose of this series of examples is to explain how BGP chooses which routes to include in Updates under various conditions. The first example, Example 12-9, focuses on the commands used to examine what R6 sends to..
Overlapping Virtual Private Networks
The SuperCom example might lead you to believe that a VPN is associated with a single VRF in a PE-router. Although that would be true in the case where the VPN customer needs no connectivity with other VPN customers, the situation might become more complex and require more than one VRF per VPN customer. Imagine that SuperCom wants to extend its service offering with a Voice over IP (VoIP) service with gateways to the public voice network located in San Jose and Paris, as sho..
Configuring Basic AppleTalk Dialup Services
Throughout this chapter, we have been looking at the routing capabilities for AppleTalk in the Cisco IOS. The Cisco IOS also allows remote access from AppleTalk clients, similar to the functionality covered in the previous chapter for dialup IP. AppleTalk remote access provides users with the capability to use AppleTalk network services, although they are not physically connected to a dedicated LAN segment on the network. Within the IOS, the remote access capability for Appl..
The IOS software found on Cisco routers and other devices has dozens of features to aid in the operation of the network and of the router itself. In this section, we examine four features commonly implemented on the router that enhance network operation and ease the use of the router itself. Configuring Domain Name Services In TCP/IP networks today, most people refer to servers, printers, workstations, and other IP devices by their names rather than by their IP addresses. R..
Comparing Wireless and Wired LANs
How exactly does a wireless LAN get integrated with a wired LAN? Where does switching fit into a wireless LAN? Before answering these questions, it might be helpful to see how the two technologies compare. At the most basic level, switched networks involve wires, and wireless networks don’t. That might seem silly, but it points out some major differences in the physical layer. A traditional Ethernet network is defined by the IEEE 802.3 standards. Every Ethernet connection ..
