The final step is to configure RPs. To manually identify an RP, use the following global configuration command: Router(config)# ip pim rp-address ip-address [access-list] [override] Alternatively, RPs can be dynamically determined using Auto-RP. With Auto-RP, some routers need to volunteer to be RPs, while others need to advertise the RPs. Auto-RP identifies a centrally located and well-connected router to function as the mapping agent. The mapping agent learns ..
TCP Connections and Port Numbers
Two host applications using TCP must establish a TCP connection before data can flow. Each connection exists between a pair of TCP sockets, with a socket being defined as an IP address of the host, the port number used, and the transport layer protocol (TCP in this case). The connection establishment process essentially initializes the sockets, including the source and destination ports, as well as the Sequence and Acknowledgement fields. Figure 6-2 depicts a typical three-wa..
AppleTalk Routing Configuration
The assignment of AppleTalk network numbers and zone names to IOS devices and interfaces is necessary but not sufficient for AppleTalk devices to communicate with each other. To pass data back and forth, the workstations and servers on the AppleTalk network also must know which paths to take to reach one another. AppleTalk routers build and refer to tables of network numbers, which are known as routing tables. The AppleTalk routing tables operate much like IP routing tables, ..
Operational experience proves that the demand-cache mechanisms described previously did not scale well in highly dynamic routing environments such as the Internet. Fast-switching caches must generally be invalidated when there is a change in the routing table. Although route holddown can prevent cyclic churn, rebuilding the cache is computationally expensive because packets that initiate cache entries must be process-switched. CEF resolves this problem by buildi..
Access routers connect the customer or enterprise site to the distribution network. In the ISP case, the router at the remote end of an access link is typically the customer premises equipment, and may be owned and operated by the customer. For large enterprise networks, in which the LANs and WANs are managed by different divisions or contractors, the access router typically is managed by either the WAN or the LAN operator— usually this is the latter if the LA..
