EIGRP Network Design Solutions - download pdf or read online

By Ivan Pepelnjak

ISBN-10: 1578701651

ISBN-13: 9781578701650

This ebook makes use of case stories and real-world configuration examples that will help you achieve a detailed figuring out of the problems all in favour of designing, deploying, and dealing with EIGRP-based networks. It information right designs that may be used to construct huge and scalable EIGRP-based networks and files attainable methods every one EIGRP function can be utilized in community layout, implementation, troubleshooting, and monitoring.With this finished reference, you get specific insurance of all EIGRP applied sciences, together with twin, shipping protocol, and topology database. moreover you get vast insurance of EIGRP deployment over WAN and dial-up networks and data on such beneficial properties as clear out lists, path maps, summarization, EIGRP pacing, and MD5 authentication.

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The only exception being the ACK packet which has no sequence number and the acknowledgment number is put into the packet at the moment it's enqueued. Retransmissions and Retransmission Timers The sequence number and acknowledgment number fields carried in EIGRP packets enable RTP to recover from various packet loss conditions. The easiest case where the original packet is lost is handled by retransmitting the packet as long as it's not acknowledged (see Figure 2-10). Figure 2-10. RTP Recovery after Packet Loss If the acknowledgment is lost, the sending router can't detect this condition and handles the exception as though the original packet is lost—by retransmitting the original packet.

Under the following extreme circumstances, a neighbor might fail to respond to a query: 40 • • • In the event of a neighbor failure, for example, a neighbor router reload that hasn't yet been noticed through the hello mechanism In the event of a transmission media congestion or overload In the event of software or hardware errors In all these circumstances, the router originating the diffusing computation is blocked from completing the computation. To prevent these types of deadlock situations, EIGRP contains a built-in safety measure—a maximum time a diffusing computation can take.

The detailed sequencing operation of EIGRP RTP can also be seen in the debugging outputs in Example 2-6. Example 2-6. 2 AS 1, Flags 0x0, Seq 136/544 idbQ 0/0 iidbQ un/rely 0/0 … You can see the SEQ number and ACK number fields in the EIGRP data packet in the "Seq . " part of the packet printout. The first number is the packet sequence number; the second number is the acknowledgment number. As seen from the debugging output, EIGRP packets only get a sequence number when they are sent; the lines 56 displaying packets being enqueued into a particular interface or neighbor queue carry no sequence or acknowledgment number.

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