New ISP Customer

Scenario: You are a network administrator for an Internet service provider.. After successfully establishing an EBGP session between your ISP and the International Travel Agency ITA, us

1-2 Semester 8 Internetwork Troubleshooting v1.0 - Lab 14.3.3.1 Copyright  2001, Cisco Systems, Inc

Lab 14.3.3.1: New ISP Customer

AS200

Fa0/0 10.1.1.2/24 S0/0

DCE .1

.2 S0/0

Fa0/0 192.168.0.1/24

AS100

ISP1A

SanJose1

10.0.0.0/30

ISP1B

Fa0/0 10.1.1.1/24

EBGP

Objective

Provide connectivity between Autonomous Systems (AS) using BGP

Scenario:

You are a network administrator for an Internet service provider After

successfully establishing an EBGP session between your ISP and the International Travel Agency (ITA), users within the ITA network still can’t access the Internet

Step 1

Cable the lab as shown in the diagram

Load the configuration files into your routers

Step 2

Begin by viewing the routing table on router ISP1B

ISP1B#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

* - candidate default, U - per-user static route, o - ODR

2-2 Semester 8 Internetwork Troubleshooting v1.0 - Lab 14.3.3.1 Copyright  2001, Cisco Systems, Inc

P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 1 subnets

C 10.1.1.0 is directly connected, FastEthernet0/0Record your findings:

Step 3

Issue the show ip bgp command and record your output below:

Based on the output and your knowledge of BGP, what are some possible causes for routers from other autonomous systems not being able to reach

AS 100?

What is your plan of action to allow Internet access for the ITA autonomous system?

Step 4

Implement action plan and issue show ip route, show ip bgp and

Step 5

Document your work with summary of problem, troubleshooting methods and resolution