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This is particularly bad if a network administrator applies a metric of more than 1 to a link, to indicate a slow transmission time The overly simplistic metric generates a suboptimal routing table, resulting in packets being sent over slow (or otherwise costly) links when better paths are available Other routing protocols use a more complex metric to include the throughput of each link in use RIP-enabled devices will accept RIP updates from any device This enables a misconfigured device to disrupt an entire network quite easily Other protocols allow "neighbors" to be defined as the only ones from which to accept routing updates RIP does not carry subnet mask information in updates It assumes all interfaces on the network have the same mask Because of this, the network can run out of usable Internet-compatible addresses earlier than is necessary On larger internetworks, convergence time is unacceptably slow (greater than 5 min) for most commercial applications such as database access or financial transactions The Split Horizon with Poison Reverse Update algorithm in RIP only counters routing loops between adjacent routers Other routing protocols employ more sophisticated mechanisms to counter larger routing loops, thereby allowing the safe use of a zero hold-down value, which speeds up convergence time considerably RIP updates use more bandwidth than other protocols, mainly because the whole routing table is sent in updates Even though it may not be the best protocol available, there are still those who have to introduce Cisco routers into a largely Unix-based routing environment, and the only routing protocol that routers can use to exchange information reliably with Unix machines is RIP With that in mind, let's see what needs to be done to configure RIP on a Cisco router The first step is to enable the process on the router, which is achieved as follows: Router1(config)#router rip Router1(config-router)network ABCD The first line defines RIP as a running process, and the second defines the whole network number that will be advertised by RIP on initial startup of the routing process You need to add entries for all the network numbers that are directly connected If there may be interfaces on the router that you do not want to send routing updates through, consider Fig 4-5.

After a transport protocol has been selected, which boils down to whether the communication should be connection-oriented or connectionless, the information is passed to the Internet layer to determine who is responsible for the delivery of the information There are a few protocols that run at the Internet layer; IP, ICMP, and ARP are examples

system-wide parameters; interface, which defines WAN or LAN interfaces; line, which defines the characteristics of a serial terminal line; and router subcommands, which are used to configure a routing protocol

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internet Protocol The Internet Protocol (IP) provides packet delivery for protocols higher in the model It is a connectionless delivery system that makes a best-effort attempt to deliver the packets to the correct destination IP does not guarantee delivery of the packets that is the responsibility of transport protocols; IP simply sends the data The IP protocol is also responsible for the logical addressing and routing of TCP/ IP and therefore is considered a layer-3 protocol (of the OSI model) The IP protocol on the router is responsible for decrementing (usually IP is a layer-3 protocol by a value of 1) the TTL (time to live) of the (of the OSI model) and is responsible for packet to prevent it from running around in a logical addressing and routing network loop Windows operating systems have a default TTL of 128 internet Control Message Protocol The Internet Control Message Protocol (ICMP) enables systems on a TCP/IP network to share status and error information You can use the status information to detect network trouble ICMP messages are encapsulated within IP datagrams so that they may be routed throughout a network Two programs that use ICMP messages are Ping and Tracert You can use Ping to send ICMP echo requests to an IP address and wait for ICMP echo responses Ping reports the time interval between sending the request and receiving the response With Ping, you can determine whether a particular IP system on your network is functioning correctly You can use many different options with the Ping utility Tracert traces the path taken to a particular host This utility can be very useful in troubleshooting internetworks Tracert sends ICMP echo requests to an IP address while it ICMP is the protocol in the increments the TTL field in the IP header by a TCP/IP protocol suite that is responsible count of 1 after starting at 1 and then analyzing for error and status reporting Programs the ICMP errors that are returned Each such as Ping and Tracert use ICMP succeeding echo request should get one further into the network before the TTL field reaches 0 and an ICMP time exceeded error message is returned by the router attempting to forward it Also note that Internet Group Management Protocol (IGMP) is another Internet layer protocol and is used for multicast applications.