Advanced Routing Protocol Configuration and Troubleshooting using GNS3

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ITNE3007
Advanced Routing
Student ID
Student Name

Table of Contents
Introduction......................................................................................................................................5
Scenario...........................................................................................................................................6
Step 1...............................................................................................................................................7
Step2..............................................................................................................................................10
Step 3.............................................................................................................................................11
Step 4.............................................................................................................................................13
Step 5.............................................................................................................................................15
Step 6.............................................................................................................................................18
Step 7.............................................................................................................................................20
Conclusion.....................................................................................................................................22
References......................................................................................................................................23
List of Figures
Figure 1: Project scenario................................................................................................................5
Figure 2: Configure loopback0 on ISP1..........................................................................................6
Figure 3: Configure loopback0 on ISP2..........................................................................................6
Figure 4: Lo 0 and Lo1 on Melbourne3...........................................................................................6
Figure 5: Configure IP address on ISP1..........................................................................................6
Figure 6: Configure IP address on ISP2..........................................................................................7
Figure 7: Configure IP address on Melbourne3..............................................................................7
Figure 8: Verify connection on Melbourne3...................................................................................7
Figure 9: Verify connection on ISP1...............................................................................................8
Figure 10: Verify connection on ISP2.............................................................................................8
Figure 11: Configure BGP on ISP1.................................................................................................9
Figure 12: Configure BGP on ISP2.................................................................................................9
Figure 13: Configure BGP on Melbourne3...................................................................................10

Figure 14: IP routes on Melbourne3..............................................................................................10
Figure 15: Verifying connection on Melbourne3..........................................................................11
Figure 16: Showing BGP config on Melbourne3..........................................................................12
Figure 17: Shutdown lo 0 on ISP1.................................................................................................12
Figure 18: BGP config on Melbourne3.........................................................................................13
Figure 19: IP routes on ISP2..........................................................................................................14
Figure 20: Configure ACL on Melbourne3...................................................................................14
Figure 21: Configure distribute list on Melbourne3......................................................................14
Figure 22: IP routes on ISP2..........................................................................................................15
Figure 23: Clear all BGP routes on Melbourne3...........................................................................15
Figure 24: IP routes on ISP2..........................................................................................................16
Figure 25: IP routes on ISP1..........................................................................................................16
Figure 26: New IP routes on Melbourne3.....................................................................................17
Figure 27: Configure lo 100 on ISP1.............................................................................................17
Figure 28: IP routes on Melbourne3..............................................................................................18
Figure 29: Verify connection on Melbourne3...............................................................................18
Figure 30: Removing IP routes on Melbourne3............................................................................19
Figure 31: Configure BGP 200 on ISP1........................................................................................19
Figure 32: IP routes on Melbourne3..............................................................................................19
Figure 33: New IP route on Melbourne3.......................................................................................19
Figure 34: IP routes on Melbourne3..............................................................................................20

Introduction
In this assignment is based on routing protocols mainly BGP (Border Gateway Protocol). The
assignment requires to configure and troubleshoot BGP routing protocol in order to exchange
routing information with 2 ISPs (Internet Service Providers). A scenario has been given,
according to which the network has to designed and configured on 3 routers. In this task, external
BGP has to be configured on the border router so that the ISPs information can travel through
border router. The scenario is such that an International Travel Agency uses the internet for
sales. ITA has contracted 2 ISPs to provide internet services, connectivity and fault tolerance

Scenario
Figure 1: Project scenario
The scenario is such that an International Travel Agency uses internet for sales. ITA has
contracted 2 ISPs to provide internet services, connectivity and fault tolerance. The routers are in
separate Autonomous Systems with router 1 being in AS 100, router 2 in AS 200, and router 3 in
AS 300. Since these routers are in separate AS, external BGP shall be configured on the network
(Welsh, 2013).

Step 1
Figure 2: Configure loopback0 on ISP1
Figure 3: Configure loopback0 on ISP2
Figure 4: Lo 0 and Lo1 on Melbourne3
Figure 5: Configure IP address on ISP1
Figure 6: Configure IP address on ISP2

Figure 7: Configure IP address on Melbourne3
Figure 8: Verify connection on Melbourne3
Figure 9: Verify connection on ISP1

Figure 10: Verify connection on ISP2

Step2
Figure 11: Configure BGP on ISP1
Figure 12: Configure BGP on ISP2

Step 3
Figure 13: Configure BGP on Melbourne3
Figure 14: IP routes on Melbourne3

Figure 15: Verifying connection on Melbourne3

Step 4
Figure 16: Showing BGP config on Melbourne3
The * next to each route indicates the valid route and BGP will be able to use that route.
The “>” symbols next to each route indicate that the * route has been selected as the best BGP
route/path (Wang, 2010).
The local router ID is 192.168.1.1
BGP table version 3 is displayed.
Figure 17: Shutdown lo 0 on ISP1