EIGRP Protocol and Network Routing: A Comprehensive Analysis

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Que 2:
Answer:
(B) The reliable transport protocol is also known as Cisco’s protocol that use EIGRP to send
message without use TCP and UDP. The RTP used for the communication purpose between
the speaking routers and EIGRP. The protocol has an important feature, name as reliability as
it sued to design the updates of quick delivery and to track the data reception. EIGRP uses
different packets types as, update, reply, query, hello and acknowledge or ACK. For update
feature, it used to store the route information and use reliable multicasts to send the topology
changes. The next feature, query is used to find specific routes with reliable methods. Reply
feature use the unicast method that contains a specific route. Hello, used to find the neighbour
of EIGRP that sent with unreliable multicast. ACK used to send a response regarding the
update that is not reliable.
(C)
1. Four different routers that are locally connected with subnet are, R1, R2, R3 & R4. These
routers running on EIGRP and use R1 to be advertised. A feature of auto summarization that
used in all the routers was disabled so that the networks not summarised by the routers before
sending the router to the router of R1. When the feature of auto summarization disabled,
router R1 does not receive the specific route as it receives classless routes.
2. EIGRP that is known as the enhanced interior gateway protocol, used to find the router
matric value with using a complex equation. Calculate the EIGRP value with using different
attributes and follow the network performance and these attributes are: bandwidth, load,
delay and reliability
Matric of EIGRP is = 256 * ((Bandwidth * K1) + (Bandwidth * K2)/(256-Load) +
(Delay*K3) * (K5/(K4 + Reliability)))
The default value o K3 & K1 is set as 1, on the other side, the value of K5, K4 and K2 set to
0. After the calculation, the equation deduced to
Matric of EIGRP = (Delay + bandwidth) * 256

Bandwidth is = 10000000/Bandwidth, this route used as the destination network route that
represents the least bandwidth in the outgoing interface and shows in kilobits.
Delay is = delay, here is a term of delay used to represent as the sum of delays configured
that count in Microseconds in the destination network.
For example, 1:
In the table of routing of R1 EIGRP:
[ D 192.168.2.0/24 [90/2172416] through 192.168.12.2, 00:30:15, Serial0/0/1],
192.168.2.0/24 is learn through 192.168.12.2 with Metric 2172416
Calculation:
Bandwidth is = 10000000/1544 is = 6476
Delay is = 20100
That is 2010/10 = 2010 (divide by ten, that is delay in usec)
Matric is (10^7 / min. bandwidth) + (delay’s total) * 256
2010 + 6476 * 256 is equal to 2172416
Metric = (10^7 / minimum bandwidth) + (sum of delays) * 256
2010 + 6476 * 256 =2172416
For Example, 2: the routing table of EIGRP of R1 is, [D 192.168.23.0/30 [90/2681856]
through 192.168.13.2, 00:30:15, Serial0/0/0], 192.168.23.0/24 is learned through
192.168.13.2 along with Metric 2681856
Calculation:
Bandwidth is = 10000000 divide by 1544 = 6476
Delay is 20000 + 20000
40000 divides by 10 is = 4000, here is the delay that use to divide
Matric is = (10^7 / min. bandwidth) + (total of delays) * 256
4000 + 6476 * 256 = 2681856

3.
P 192.168.34.0/30, 2 successors, FD is 2681856
via 192.168.14.2 (2681856/2169856), Serial0/1/0
via 192.168.13.2 (2681856/2169856), Serial0/0/0
P 192.168.23.0/30, 2 successors, FD is 2681856
via 192.168.13.2 (2681856/2169856), Serial0/0/0
via 192.168.12.2 (2681856/2169856), Serial0/0/1
P 192.168.24.0/30, 2 successors, FD is 2681856
via 192.168.12.2 (2681856/2169856), Serial0/0/1
via 192.168.14.2 (2681856/2169856), Serial0/1/0
4.
Redundant routes are used to maintain in the memory of EIGRP for the backup of
failure of any route. At the time of failure of any route, it can revert to the backup route
instantly. The backup route selects by the feasible successor to use in an event to change the
topology without changing the recalculate routes. The time of convergence is instantaneous
as the successor of feasible can use instantly. The best way to perform for the calculation to
find the best way is Dual mode.
5.
(A) The feasible successor can be used in the conditions of fails of routes to find the next
route without recalculating the routes. As the time of use of feasible successor is high so that
is can use instantly in the less convergence time.
(B) Use the Dual for the calculation, in the condition of failure of both routes and can’t
possible to have a feasible successor.