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..

IGMPv1 Host Membership Query Functions

Multicast routers use the IGMPv1 Host Membership Query message to determine whether it has any host on any of its LAN interfaces that wants multicast traffic for any group. The IGMPv1 Host Membership Query message is sent only by multicast routers on LAN interfaces. For example, Figure 19-8 shows the IGMPv1 Host Membership Query process. It lists two steps, with the second step being the router sending the Query. Figure 19-8 IGMPv1 Host Membership Query Process   The de..

Improving FIBs: Fast IP Route-Lookup

With the staggering growth of the Internet and consequent demands on core Internet routers, the field of fast IP route-lookup has been the subject of intense interest. Although route churn in the Internet is relatively high, packet forwarding, rather than route-computation, is proving to be the critical area requiring optimization. This signifies that lookup time is optimized at the expense of routing table update time.  Route-lookup is the process of finding the best ..

Challenges Unique to WLAN Management

WLANs present several unique management challenges. Many relate to the physical aspects of the wireless environment, whereas some are the result of the dynamic nature of the wireless network and its mobile users and devices. Knowledge of these challenges will help ensure that you do not overlook these areas in framing your management strategy for the enterprise-class WLAN. Some of the most commonly experienced problems and challenges you will face include the following: •&..

EIGRP redistribute Command Reference

 First, for reference, the following lines show the generic syntax of the redistribute command when used as a router eigrp subcommand. Note that the syntax differs slightly depending on the routing protocol into which routes will be redistributed. Following that, Table 9-2 lists the options on the command with a brief description. redistribute protocol [process-id | as-number] [metric bw delay reliability load mtu ] [match {internal | nssa-external | external 1 | extern..