Information Technology Reference
In-Depth Information
Briefly explain the purpose of the Null0 route.
The 10.0.0.0/8 and 172.16.0.0/16 routes do not actually represent a path to reach the parent networks.
If a packet does not match one of the level 2 child routes, it is sent to the Null0 interface. In other
words, if the packet matches the level 1 parent—the classful network address—but none of the sub-
nets, the packet is discarded.
Packet Tracer Exercise 9-1 (Continued)
Packet Tracer
Activity
Open your LSG02-0901-task1.pka saved version of this Packet Tracer Exercise. According to your
answers to the questions in the “Configuring EIGRP as the Routing Protocol” exercise, complete the
steps in Task 2.
Task 2: Configure and Verify EIGRP Routing
Configure EIGRP routing on HQ and the Branch routers (B1, B2, B3). Include the com-
mands to disable automatic summarization and to stop unnecessary EIGRP updates.
Step 1.
View the neighbor tables, protocol configuration, and routing tables for all routers. Answer
the following questions.
Step 2.
How many EIGRP neighbors does HQ have?
3
1.
How many EIGRP neighbors do B1, B2, and B3 have?
1
2.
What are the values for K1 and K3?
1
3.
What are the internal distance and external distance for EIGRP?
90 and 170
4.
How many routes did HQ learn through EIGRP?
8
5.
Your completion percentage should be 76%. If not, review the previous steps to see what
part of the task you left incomplete.
After completing the routing configurations, save your Packet Tracer file to use again in the next sec-
tion. Save the file as LSG02-0701-task2.pkt. Keep the file open to use for the next section.
EIGRP Metric Calculation
Although EIGRP includes hop count in its routing updates, hop count is not used as part of the
EIGRP composite metric. The following sections review the values of the EIGRP metric and describe
how EIGRP performs the calculation to arrive at the metric displayed in the routing table.
EIGRP Metric Concepts
List the values EIGRP uses in its composite metric to calculate the preferred path to a network.
Bandwidth
■
Delay
■
Reliability
■
Load
■
