Tài liệu OSPF Challenge Lab docx

1 - 2 Semester 5: Advanced Routing v2.0 - Lab 5.9.1 Copyright  2001, Cisco Systems, Inc.

5.9.1 OSPF Challenge Lab

Lo 172.16.1.1 /24
S0/0 172.16.0.5 /30
S0/0 172.160.5 /30
Fa0/0 192.168.1.2 /24
S0/1 192.168.64.1 /30
S0/0 192.168.64.2 /30
Fa0/0 192.168.1.3 /24
Fa0/0 192.168.72.1 /30
S0/0 192.168.224.2 /30
S0/0 192.168.224.1 /30
S0/1 192.168.240.1 /30
S0/0 192.168.240.2 /30
Fa0/0 192.168.248.1 /24
Workstation2
192.168.72.2 /30
Workstation
192.168.248.2 /24
ISP2
SanJose2
SanJose3
Singapore
Auckland
Westasman
AREA 0
AREA 1

Objective
In this lab, you create a multiarea OSPF autonomous system that includes a totally
stubby area and a persistent default route toward the ISP.

Scenario
As the Enterprise Network Administrator for International Travel Agency, you are
responsible for designing and implementing internetwork connectivity. To ensure success
by reducing complexity, you start scaling the network by connecting only the Asia region
and one local site, West Tasman, to the San Jose corporate headquarters and ISP2.
When you are satisfied with the results, you will implement all other regions and sites.


Design Considerations
At this point, West Tasman is in stub Area 1 with one egress point and no need to
redistribute external routes. The router at West Tasman has been in service for several
years and might not be able to keep up with a large OSPF internetwork. Your
autonomous system also has only one egress point to the Internet. Instead of the
administrative burden of many static routes, you want a stable default route advertised
through OSPF, but you are concerned about route flapping if your WAN link to ISP2 is
unstable. When provisioning the network, you upgraded the memory and processor on
SanJose2, intending it to be the ASBR and the DR for any area it is a member of.


2 - 2 Semester 5: Advanced Routing v2.0 - Lab 5.9.1 Copyright  2001, Cisco Systems, Inc.

Implementation Requirements

• Configure Area 1 as a Totally Stubby Area.
• Advertise a persistent default route from SanJose2 through OSPF.

• SanJose2 will always be the DR in Area 0.
• SanJose3 will never be the DR in Area 0.

Implementation Completion Tests

• Successful pings to ISP2 from workstation1 and workstation2.
• Only a default route in the Westasman route table.
• The show command verifies that SanJose2 is DR.
• Two minutes after a WAN link failure (disconnect the serial cable from ISP2),
an E2 default route is still present in Auckland.