Summary

• Disabling split horizon should not be used to resolve distance-vector protocols and split horizon rule reachability issues.

• In point-to-point subinterface configurations, a single subinterface is used to establish one PVC connection to another physical connection or subinterface on a remote router.

• In multipoint subinterface configurations, a single subinterface is used to establish multiple PVC connections to multiple physical connection or subinterfaces on remote routers.

• There are six steps required to configure a subinterface on a basic Frame Relay connection.

© 2004 Cisco Systems, Ir

Use the practice items here to review what you learned in this lesson. The correct answers are found in the Quiz Answer Key.

Q1) Turning off split horizon on an NBMA environment increases the chance of creating routing loops.

A) true

B) false

Q2) What is the recommended solution to avoid split horizon issues?

A) Do not use a distance-vector protocol over Frame Relay.

B) Enable broadcast on the serial interface.

C) Configure subinterfaces.

D) Turn off split horizon.

Q3) Which type of Frame Relay connection will eliminate broadcast and split horizon issues?

A) multipoint subinterface

B) point-to-point subinterface

C) multipoint

D) point-to-point

Q4) What must be configured on the hub router to allow one subnet to be used for all router interfaces participating in the Frame Relay circuit?

A) multipoint subinterfaces

B) point-to-point subinterfaces

C) IP unnumbered with multipoint subinterfaces

Q5) To configure Frame Relay subinterfaces, you must specify which parameter?

B) traffic rate

C) map class

D) traffic shaping

E) multipoint or point-to-point

Q6) The command frame-relay interface-dlci should be used only on subinterfaces.

A) true

B) false

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