ITNE3007: BGP Configuration and Connectivity in GNS3

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ITNE3007
Student Name: - Mohammed Abdul Khaliq
Student ID:-Ab40081

Table of Contents
Scenario.......................................................................................................................................................3
References.................................................................................................................................................14
Appendix...................................................................................................................................................15

Scenario
Shows the configuration of the Ip routers.
I. Step 1: configuring the Network diagram in GNS3 then configuring IP addresses and BGP on ISP1
and ISP2 router.
a. First we will create the sample topology in GNS3 then change the hostname of the routers
according to the project requirements.
b. Then we will open the console of routers and start our configuration.

\
Now, verifying that ISP1 is not able to reach to ISP2 (using PING command)
 Ping command uses ICMP protocol to check connectivity with any host.
 When we are working in GLOBAL EXECUTION MODE then we can use do with the PRIVILEGE
LEVEL’S show commands (Takahashi et al, 2015).

II. Step 2: configuring the MELBOURNE3 router and then the connectivity of these with ISP routers.
III. Step 3: Configure BGP on MELBOURNE3

Verifying the connectivity of MELBOURNE3 router with the loopbacks of ISP1 and ISP2 (Using PING
command).
IV. Step 4: Output
1. Asterisks (*) means the Valid path through which the packets could be sent for a specific
destination.
2. ‘>’ Symbol indicates that it is the best path for a destination (Paraskevopoulos et al, 2016).
3. Router Id is : 192.168.1.1
4. Current BGP table version is 5
5. After disabling the loopback0 of ISP1 the BGP table version will be changed to 6 as shown :

6. Now we will again enable the Loopback0 of ISP1 and then issue the show ip bgp neighbors
And we can see that the Neighbor state is being displayed as Established

7. Current UP TIMER is shown as 00:20:32
V. Step 5: Applying
The route for 12.0.1.0 is displaying on ISP2 or we can say that ISP1 and ISP2 are also receiving each other
loopback routes. We have to advertise only the loopback addresses of MELBOURNE3 router. So we will
apply the Distribute list so that we can perform Route-filtering in BGP.

VI. Step 6: Configuring the Default-routes towards the ISP1 and ISP2
Now we will configure the default routes towards our ISPs. As we have two ISP, there will be two
default-static routes present on MELBOURNE3 router.

Now we have created a loopback on ISP1 and then checked the connectivity of MELBOURNE3 router. If
the PING to this new loopback will be successful then we can say that the default-static routes are
configured correctly.
 We have configured default static routes but we can see that only one default route towards
ISP1 is being displayed. This is because this router has lower AD of 210 than the other route. So
the lower AD route is being displayed here.
 Now we have also checked the connectivity of MELBOURNE3 to newly created loopback address
210.210.210.1/24 (Zokaee et al, 2017).

VII. Step 7: Creating a default route towards ISP1 and a backup route towards ISP2.
First, we remove the default static routes we configured previously.
Now we promote the loopback 210.210.210.1 through BGP and then configure ISP1 as our Default ISP
and ISP2 as our Backup ISP.