ISP Expansion and Upgrade

1-3 Semester 8 Internetwork Troubleshooting v1.0 - Lab 14.3.2 Copyright  2001, Cisco Systems, Inc.
Lab 14.3.2: ISP Expansion and Upgrade
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
IBGP
EBGP


Scenario:
You are a network engineer at an Internet service provider. You are
completing an upgrade to your network that will allow support for more
customers. A few edge routers intended to establish EBGP sessions are still
on back-order from the supplier. In order to meet contractual agreements
with one of your customers, International Travel Agency (ITA), you need to
supply Internet connectivity by the end of the day.
There are concerns that the available edge router lacks both memory and

processing power to handle the BGP routing table. Until the new router
arrives you choose to implement BGP on a router that will eventually
establish IBGP sessions only.
The ITA engineers and a co-worker of yours have configured BGP, but they
have not successfully exchanged routes. You have been asked to assist in
troubleshooting the session.
Step 1
Cable the lab as shown in the diagram.
Load the configuration files into your routers.

2-3 Semester 8 Internetwork Troubleshooting v1.0 - Lab 14.3.2 Copyright  2001, Cisco Systems, Inc.
Step 2
Begin by verifying connectivity between ISP1B SanJose1. Ping 192.168.0.1
from ISP1B. Record your results:
ISP1B#ping 192.168.0.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms

Connectivity should be successful.
Step 3
View BGP status; issue the following commands and record your output
below:
• show ip bgp neighbor
• show ip bgp summary


Step 4

What are possible causes of the problem?



What is your action plan to resolve the problem?


Step 5
Implement your action plan and observe results by issuing the show ip
bgp neighbors and show ip bgp summary commands. If there is no
change in status, try issuing the clear ip bgp * command.


3-3 Semester 8 Internetwork Troubleshooting v1.0 - Lab 14.3.2 Copyright  2001, Cisco Systems, Inc.
Step 6
Document your work with summary of problem, troubleshooting methods
and resolution.