By Alex Zinin
During this booklet, a number one specialist on Cisco routing deals in-depth assurance of 4 key intra-domain protocols -- RIP, IGRP, OSPF, and EIGRP. in contrast to different books on Cisco protocols, Alex Zinin indicates you precisely what is occurring within your routers in the event you use those protocols -- so that you can maximize your keep watch over over them, and leverage their complete energy. Cisco IP Routing demystifies even the main advanced internals of Cisco IP routing with transparent factors, huge visuals, and plenty of real-world examples, configurations, and community designs. the guts of the publication is its assurance of dynamic routing, beginning with conception after which relocating to the sensible information of powerful configuration. Alex Zinin additionally offers in-depth assurance of controlling routing by way of changing replace circulation, redistribution, and coverage routing. For all community directors, different Cisco networking pros, and somebody getting ready for Cisco's one of the best CCIE examination.
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Extra resources for Cisco IP Routing: Packet Forwarding and Intra-domain Routing Protocols
0 is directly connected to the interface Ethernet 1 Figure 3-3. 0. 0. R1 will drop the packet and send an ICMP "Destination Unreachable" message to host A. What information would R1 need in its routing table to successfully route the packet to host C? 0 is reachable via router R2. The routing table of R1 would have to look like the following. 2 With this information, the router would make its forwarding decision as follows. 1. 2 (host C). 2. 2. 3. 2. 4. 2. 5. 0 that is directly connected to interface Ethernet 1.
4. Otherwise, if the interface type is broadcast, perform the following steps. a. Search the ARP cache for the MAC address corresponding to the next-hop address and outbound interface. b. If no ARP entry is found, log an encapsulation failure, send an ARP request message for the next-hop address, send an ICMP "Destination Unreachable, Host Unreachable" message to the source host, and drop the packet. Note that the router does not wait for the ARP reply message to come in and does not queue the packet.
Routers route packets according to the information they have in the routing tables at a particular instance. When it 45 46 forwards a packet to the next router, a router assumes that the next router will do the same: make its decision according to the information in its own routing table. Only consistent routing information can guarantee a consistent forwarding decision throughout the network. • The fact that one router has certain information in its routing table does not mean that other routers have the same information.