Network Routing and Configuration

Running head: NETWORK ROUTING AND CONFIGURATION
Network Routing and Configuration
Name of the Student
Name of the University
Author Note

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Executive Summary
In recent years networking is continuing to gain importance among businesses and firms as
they look forward to maximise their profit margins by cutting down on their operational
costs. Optimal and efficient routing concepts in the networks of organization plays a critical
role in this process. The report is to hence look at how efficiently certain routing protocols
can be applied on different sections of the organization network. It is also to highlight the
benefits of applying these routing techniques and then goes to suggest how optimizations of
the network can be performed. After providing the configuration commands and explaining
their use, the report provides proof of the connectivity and configurations applied on the
network. Thereafter the report ends with concluding notes.

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Table of Contents
Introduction................................................................................................................................3
Solution......................................................................................................................................3
Routing techniques and Justification.....................................................................................3
Network Optimization and Consequences.............................................................................4
IOS configuration commands................................................................................................5
Connectivity and Configuration.............................................................................................7
Somerset Routing Table.....................................................................................................7
Street Routing Table..........................................................................................................8
Glastonbury Routing Table................................................................................................9
Wells Routing Table........................................................................................................10
Cheddar Routing Table....................................................................................................11
BGP connectivity between Street and ISP.......................................................................12
Restricting Access from EIGRP network with ACL.......................................................13
Conclusion................................................................................................................................16
Bibliography.............................................................................................................................18

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Introduction
Networks play an essential role in the cost effective functioning of companies. This is
why it is always important for firms to implement the optimum configuration in their
internetwork by using appropriate routing techniques. The solution looks at how a typical
company implements routing techniques for different sections of their network so that the PC
X is able to ping PC Y as also ensure internet services are being received by the Street router
from the ISP. The report justifies these configurations, talks about the benefits that can be
obtained from the use of such techniques and then talks about optimizing the network setup.
Here, when it comes to greenfield networks, the report first touches on the positioning of the
routers and network and then talks of implementing the routing configuration followed by IP
addressing. Then the shortest path is figured out and routing policies are applied accordingly.
After showing the proof of connectivity and configuration the report comes to an end with
conclusions.
Solution
The network design makes use of different routing techniques for connection between
different sections of the network. The PCs X and Y send and receive messages to each other
by traversing through these network sections.
Routing techniques and Justification
The different routing techniques that have been used in the network are EIGRP, OSPF
and RIP. The EIGRP routing technique has been applied in the network between the routers
of Somerton, Langport, Street and Compton Dundon. Between the routers, Street and
Glastonbury, OSPF routing has been used and the area formed here is area 0. OSPF also gets
used between the routers Glastonbury and Wookey Hole to form the area 51. Lastly the
routers of Wookey Hole and Cheddar form the area 52 through OSPF routing. In the routers

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that are positioned in between two network segments, RIP configuration is applied to route
between different networks with differing routing techniques. This lets network packet sents
from PC X to traverse through the different networks and reach the PC Y and vice versa.
The benefits that can be obtained from EIGRP are as follows:
 EIGRP makes it easy for transitioning from IPv4 to IPv6 networks and in allowing
multi-address family support.
 It enables swift convergence timing of changes to the network design.
 With Equal Cost Multipath or ECMP and Unequal Cost Load Sharing, EIGRP
ensures efficient usage of network links.
The notable benefits from OSPF routing can be the following:
 Provides a loop-free routing protocol
 Transmits route changes to the autonomous system in shortest time possible.
 Enables division of network segments based on area numbers as the autonomous
systems gets divided to multiple sections.
Network Optimization and Consequences
For greenfield networks the positioning of the physical routers needs to be done in
such a way that minimal changes to the router position is needed for future changes and
expansions of the network topology. The position should also take into account the cost of
cabling that are to be necessary for setting up the network. Optimal number of network
devices are to be figured out for meeting the demands at the allocated cost.
Since greenfield networks are concerned with building networks from scratch, the
EIGRP routing protocol for network 11.22.33.0 should be replaced with OSPF protocol as

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this protocol uses the shortest path and only one main router needs summary of all network
configurations.
As for the routing protocols, first the EIGRP routing is to be applied in the network of
PC X and OSPF routing in the network of PC Y in area 52. Then the two networks in
between need to be configured with OSPF for area 0 and area 51. Next the required
configuration for DR and BDR elections are applied in routers Glastonbury Wookey Hole
and Wells in area 51.
After establishing the network, the efficient IP addressing is a must for optimal
network configuration. With proper subnetting, minimum IP address space will be wasted by
the company network which will in turn reduce the cost overhead and improve the network
traffic overhead on networking devices.
The routers present in the OSPF networks are treated as nodes and the edges formed
by these router with each other are considered as links. Every unidirectional link comprises of
a fixed capacity and configurable weight. Provided i and j are the nodes of a network between
which packets traverse through the link l, the shortest path is calculated as Pijl for all links
along the path. For the rest of the links outside the path Pijl = 0. Thus this helps in figuring out
the shortest path between the specific routers and the policy based routes (PBR) are applied
on the routers accordingly.
IOS configuration commands
The configuration commands for the routers of the EIGRP network are:
#router eigrp 321
#network 11.22.33.0
The routing configuration commands for the routers of the OSPF network for area 0 are:

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#router ospf 10
#network 22.33.44.0 0.0.0.255 area 0
The routing configuration commands applied in the routers of OSPF network for area 51 are:
#router ospf 11
#network 33.44.55.0 0.0.0.255 area 51
Lastly, routing configuration commands for the routers of OSPF network for area 52 are:
#router ospf 12
#network 44.55.66.0 0.0.0.255 area 52
Additionally in area 51 the designated router or DR and backup designated router or
BDR election configurations are applied by setting the ospf priorities in the Glastonbury and
Wells routers. This is the command – ‘ip ospf priority’ followed by priority value which is
100 for Glastonbury and 50 for Wells. This is because the Glastonbury router serves as the
DR while the Wells router serves as the BDR. These configuration commands are applied
within the global configuration mode of the respective routers.
To ensure that the DR/BDR priorities are always picked in order by the routers, in
each router of area 51 virtual links were assigned with the command ‘interface loopback 0’
also in global configuration mode.

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Connectivity and Configuration
Somerset Routing Table
The above screenshot shows the routing table of the Somerset router.

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Street Routing Table
This screenshot shows the routing table of the Street router.

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Glastonbury Routing Table
The screenshot taken shows the routing table for the Glastonbury router.

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Wells Routing Table
The screenshot shows the routing table found in the Wells router.

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Cheddar Routing Table
The routing table of the Cheddar router has been shown in the screenshot above.

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BGP connectivity between Street and ISP
This screenshot shows the BGP configuration between the street and the ISP routers.
For connecting with the ISP from the Street router, the BGP routing protocol is used where
the autonomous system 65000 for the street router. Here, the autonomous system for the ISP
is 65001.

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Restricting Access from EIGRP network with ACL
The access to ISP by the EIGRP network is restricted by configuring an Access
Control List (ACL) in the Street router. The ACL 100 denies ICMP ping from the network
11.22.33.0 to 192.168.11.0.

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This screenshot shows the IP configuration of PC X.
The above screenshot shows the IP addressing configuration of PC Y.

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A ping request is made by PC X to PC Y by pinging the IP address of PC Y. The above
screenshot shows that the PC X is successfully able to ping PC Y.

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A ping request is made by PC Y to PC X by pinging the IP address of PC X. This screenshot
shows that the PC Y is successfully able to ping PC X.
Conclusion
To conclude, the report successfully highlights the importance that networks hold for
the cost effective functioning of businesses which makes it a primary concern of companies
to implement the optimum configuration of their internetwork by using appropriate routing
techniques. The report is observed to study how a typical company implements routing
techniques for different sections of their network so that the PC X is able to ping PC Y as
also ensure internet services are being received by the Street router from the ISP. The
solution gives justification for these configurations, talks about the benefits that can be
obtained from the use of such techniques and then talks about optimizing the network setup.
Here, when it comes to greenfield networks, the report first touches on the positioning of the
routers and network and then talks of implementing the routing configuration followed by IP

17NETWORK ROUTING AND CONFIGURATION
addressing. Then the shortest path is figured out and routing policies are applied accordingly.
The report then ends with screenshots showing proof of configurations and connectivity.

18NETWORK ROUTING AND CONFIGURATION
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